🧮 Free Online Calculator Tools
Free online calculators for math, finance, health, and everyday calculations. Accurate, fast, and easy to use. No signup required.
247 free toolsHow to Use These Tools
- Choose a tool from the list above that matches your needs.
- Click "Use Now" to open the tool in a new page.
- Follow the tool-specific instructions to process your data.
- Copy or download the results — all processing happens in your browser!
APY Calculator
Free online APY calculator. Calculate Annual Percentage Yield with various compounding frequencies. Real-time results. Client-side.
Use Now →APY Calculator
Free online APY calculator. Calculate Annual Percentage Yield from interest rate and compounding frequency. Supports daily, monthly, quarterly, and ye
Use Now →Amortization Calculator
Free online amortization calculator. Generate a full loan amortization schedule with monthly payment breakdown. Enter loan amount, interest rate, and
Use Now →Angle Converter
Free online angle converter. Convert between degrees (°), radians (rad), gradians (grad), arcminutes ('), arcseconds (\
Use Now →Area Converter
Free online area unit converter supporting square meters, square kilometers, hectares, acres, square feet, square yards, and 15+ area units. Pure fron
Use Now →Area Converter
Free online area unit converter supporting square meters, square kilometers, ...
Use Now →Auto Loan Calculator
Free online auto loan calculator. Calculate monthly payments, total interest, and total cost. Full amortization schedule. Client-side.
Use Now →Auto Loan Calculator
Free online auto loan calculator. Calculate monthly car payments, total interest, and total cost. Input car price, down payment, APR, and loan term. R
Use Now →Average Calculator
Free online average calculator. Compute mean, median, mode, and range for any set of numbers. Real-time statistics. Client-side.
Use Now →Average Calculator
Free online average calculator. Quickly calculate mean, median, mode, and range for any set of numbers. Real-time statistics. Client-side processing.
Use Now →BMI Calculator Online
Free online BMI calculator. Calculate your Body Mass Index instantly with metric/imperial unit switching. Get BMI classification, health recommendatio
Use Now →BMR Calculator
Free online BMR (Basal Metabolic Rate) calculator using Harris-Benedict and Mifflin-St Jeor equations. Calculate daily calorie needs, get weight manag
Use Now →Baking Conversion Calculator
Free online baking conversion calculator. Convert cups, tablespoons, and teaspoons to grams and ml for flour, sugar, butter, milk, and more ingredient
Use Now →Binary Calculator - Binary Arithmetic & Bitwise Operations Free
Free online binary calculator. Supports binary arithmetic, bitwise operations (AND/OR/XOR/NOT/shift), and base conversion. Client-side processing, pri
Use Now →Break
Free online break-even calculator. Calculate your break-even point in units and revenue. Enter fixed costs, variable cost per unit, and selling price.
Use Now →Break-Even Calculator - Calculate Break-Even Point Online
Free online break-even calculator. Calculate your break-even point in units and revenue. Enter fixed costs, variable c…
Use Now →Brick Calculator
Free online brick calculator. Enter wall dimensions to estimate bricks needed and mortar volume. Supports multiple brick types. Client-side only, no d
Use Now →CIDR Subnet Calculator
Free online CIDR subnet calculator. Calculate network address, broadcast address, usable IP range, subnet mask from CIDR notation. Pure client-side IP
Use Now →CRC32 Checksum Calculator
Free online CRC32 checksum calculator. Compute 32-bit cyclic redundancy check for text strings and files. Hex and decimal output, standard IEEE 802.3
Use Now →CRC32 Checksum Calculator - Free Online CRC32 Hash Generator | Text & Files
CRC32 Checksum Calculator - Free Online CRC32 Hash Generator | Text & Files
Use Now →CSV Row Filter
Free online CSV row filter. Quickly filter CSV data based on conditions. Supports column value filtering (equals/contains/greater than/less than/regex
Use Now →CSV to Excel
Free online CSV to Excel (XLSX) converter. Quickly transform CSV files into downloadable Excel spreadsheets. Supports custom delimiters, encoding opti
Use Now →CSV to Markdown Table
Free online CSV to Markdown table converter. Convert CSV data to Markdown format with custom delimiter, header detection, and alignment settings. Pure
Use Now →CSV to Markdown Table Converter Online
Free online CSV to Markdown table converter. Generate GitHub-flavored Markdown tables from CSV data. Client-side processing.
Use Now →CSV to SQL Converter Online
Free online CSV to SQL converter. Convert CSV data to SQL INSERT statements instantly. Supports custom table names, column mapping, data types. Client
Use Now →CSV to TSV
Free online CSV to TSV converter and vice versa. Convert comma-separated data to tab-separated format with one click. Supports quote escaping, custom
Use Now →Calorie Calculator
Free online calorie calculator. Calculate your BMR (Basal Metabolic Rate) and TDEE (Total Daily Energy Expenditure). Get personalized calorie and macr
Use Now →Calories Burned Calculator
Free online calories burned calculator. Scientifically estimate calories burned for 100+ exercises using MET values. Enter weight and duration. Client
Use Now →Carbon Footprint Calculator Online
Free online carbon footprint calculator. Estimate your annual CO2 emissions from travel, energy, diet, and lifestyle. Client-side only.
Use Now →Case Converter
Free online case converter tool. Convert text to UPPERCASE, lowercase, Capitalized, camelCase, PascalCase, snake_case, SCREAMING_SNAKE and more. Real-
Use Now →China Tax Calculator 2026
Free online China income tax calculator 2026. Calculate salary tax, year-end bonus tax, taxable income, net pay. Supports social insurance deductions
Use Now →Circle Calculator Online
Free online circle calculator. Enter radius, diameter, circumference, or area to calculate all values. Shows formulas and calculations. Essential geom
Use Now →Combination & Permutation Calculator
Free online combination and permutation calculator. Calculate nCr (combinations) and nPr (permutations) with step-by-step solutions. Supports large nu
Use Now →Compound Interest Calculator
Free online compound interest calculator with recurring contributions, visual growth charts, and detailed yearly breakdowns. All calculations run loca
Use Now →Correlation Calculator
Free online Pearson correlation coefficient calculator. Compute r value with scatter plot and trend line. Statistical analysis tool, pure frontend.
Use Now →Crypto Profit Calculator
Free online crypto profit calculator. Enter buy price, sell price, quantity and fees to calculate your investment returns. Shows profit, ROI%, total i
Use Now →Crypto Profit Calculator
Free online crypto profit calculator. Enter buy price, sell price, quantity and fees to calculate your investment returns. Shows profit, ROI%, total i
Use Now →Crypto Profit Calculator - Calculate Cryptocurrency Investment Returns Online
Free online crypto profit calculator. Enter buy price, sell price, quantity and fees to calculate your investment retu…
Use Now →Currency Converter
Free online currency converter. Convert between 40+ world currencies including USD, EUR, CNY, JPY, GBP. Built-in reference rates. Client-side only.
Use Now →Data Size Converter
Free online data storage converter. Convert between Byte, KB, MB, GB, TB, PB, EB. Supports binary (1024) and decimal (1000) standards. Batch conversio
Use Now →Date Duration Calculator Online
Free online date duration calculator. Calculate exact time between two dates in years, months, days, hours. Business days calculation included. Client
Use Now →Decimal to Hex Converter
Free online Decimal to Hex converter. Convert decimal numbers to hexadecimal. Supports integers, decimals, and negative numbers. Real-time bidirection
Use Now →Discount Calculator Online
Free online discount calculator. Calculate sale price, savings amount and discount percentage. Supports percentage off, fixed amount off, multi-item d
Use Now →Distance Calculator
Free online distance calculator. Enter 2D or 3D coordinates to calculate the Euclidean distance between two points. Shows step-by-step solution. Clien
Use Now →Distance Calculator
Free online distance calculator. Enter 2D or 3D coordinates to calculate the Euclidean distance between two points. Shows step-by-step solution.
Use Now →Distance Calculator - Calculate Distance Between Two Points Online
Free online distance calculator. Enter 2D or 3D coordinates to calculate the Euclidean distance between two points. Sh…
Use Now →Download Time Calculator
Free online download time calculator. Enter file size and network bandwidth to instantly estimate download duration. Supports B/KB/MB/GB/TB and bps/Kb
Use Now →Due Date Calculator
Free online due date calculator. Calculate expected due date, current pregnancy week, and trimester from LMP or conception date. Pure frontend, privat
Use Now →Due Date Calculator · Free Online Pregnancy Tool
Free online due date calculator. Calculate expected due date, current pregnancy week, and trimester from LMP or conception date. Pure frontend, privat
Use Now →Energy Converter
Free online energy converter. Convert between Joules (J), Kilojoules (kJ), Calories (cal), Kilocalories (kcal), Kilowatt-hours (kWh), Electronvolts (e
Use Now →Excel to CSV Converter
Free online Excel to CSV converter. Convert XLSX/XLS files to CSV format quickly. Supports multi-sheet selection, custom delimiters, and encoding opti
Use Now →Final Grade Calculator
Free online final grade calculator. Calculate what score you need on your final exam to achieve your target grade. Supports weighted grading with mult
Use Now →Final Grade Calculator
Free online final grade calculator. Calculate what score you need on your final exam to achieve your target grade.
Use Now →Font Size Converter
Free online font size converter. Convert between PX, EM, REM, PT, and Percent instantly. Essential for responsive web design.
Use Now →Fraction Calculator
Free online fraction calculator. Add, subtract, multiply, and divide fractions with step-by-step solutions. Simplify fractions and convert to decimals
Use Now →Fraction to Decimal Calculator - Convert Fractions & Decimals Online
Free online fraction to decimal calculator. Convert fractions to decimals and decimals to fractions. Supports proper/i…
Use Now →Free Online Decimal to Roman Numeral Converter
Free Online Decimal to Roman Numeral Converter
Use Now →Free Online Ebook Format Converter - EPUB to TXT, Markdown to EPUB | Client-Side
Free Online Ebook Format Converter - EPUB to TXT, Markdown to EPUB | Client-Side
Use Now →Free Online Octal Decimal Converter - Base Converter with Reference Table
Free Online Octal Decimal Converter - Base Converter with Reference Table
Use Now →Frequency Converter
Free online frequency converter. Convert between Hz, kHz, MHz, GHz, THz, RPM, and rad/s instantly. Client-side processing, no data upload.
Use Now →Fuel Cost Calculator
Free online fuel cost calculator. Estimate trip fuel costs based on distance, fuel economy, and fuel price. Supports L/100km and MPG. Client-side tool
Use Now →Fuel Cost Calculator
Free online fuel cost calculator. Calculate trip fuel cost based on distance, fuel efficiency, and fuel price.
Use Now →Fuel Efficiency Converter
Free online fuel efficiency converter. Convert between MPG (US/UK), km/L, and L/100km instantly. Client-side, no upload.
Use Now →Full
Free online full-width and half-width character converter. Convert between full-width and half-width characters including letters, numbers, punctuatio
Use Now →HEX to HSL Color Converter - Free Online Tool | Real-time Preview
HEX to HSL Color Converter - Free Online Tool | Real-time Preview
Use Now →Heart Rate Zone Calculator
Free online heart rate zone calculator. Calculate max HR, resting HR, and target heart rate zones using Karvonen formula or percentage method. For run
Use Now →Height Converter Online
Free online height converter. Convert between cm, feet, and inches instantly. Real-time bidirectional conversion with reference chart. Client-side onl
Use Now →Home Affordability Calculator
Free online home affordability calculator. Calculate how much house you can afford based on income, down payment, and debts. Client-side.
Use Now →Home Affordability Calculator
Free online home affordability calculator. Estimate how much house you can afford. Input income, down payment, interest rate, and debts. Get your pric
Use Now →ICO Icon Converter
Free online image to ICO converter. Convert PNG/JPG/WebP to ICO format. Custom icon sizes from 16x16 to 256x256. Perfect for website favicons and Wind
Use Now →IP Subnet Calculator
Free online IP subnet calculator. Calculate IPv4 subnet information including network address, broadcast address, host range, and CIDR notation. Pure
Use Now →IPv4/IPv6 Address Converter
Free online IPv4/IPv6 address converter. Convert IPv4 to IPv6 (IPv4-mapped addresses), IPv6 to IPv4 (when applicable), abbreviate/expand IPv6 addresse
Use Now →Inflation Calculator
Free online inflation calculator. Calculate future purchasing power, money devaluation, and compare different inflation scenarios. Client-side only.
Use Now →Lean Body Mass (LBM) Calculator
Free online Lean Body Mass (LBM) calculator. Calculate LBM using Boer, James, and Hume formulas. Estimate body fat percentage and fat mass. Client-sid
Use Now →Lean Body Mass (LBM) Calculator - Calculate LBM & Body Fat
Free online Lean Body Mass (LBM) calculator. Calculate LBM using Boer, James, and Hume formulas. Estimate body fat per…
Use Now →Leet Speak Converter
Free online Leet Speak (1337 5p34k) converter. Transform plain text into leet style with multiple conversion levels (basic/intermediate/advanced). Pur
Use Now →Length Converter
Free online length converter. Convert between meters (m), kilometers (km), centimeters (cm), millimeters (mm), feet (ft), inches (in), yards (yd), mil
Use Now →Loan Calculator Online
Free online loan calculator. Equal installment and equal principal methods. Calculate monthly payment, total interest, total payment, amortization sch
Use Now →Loan Payoff Calculator
Free online loan payoff calculator. Calculate interest savings and time saved with extra payments. Pure frontend.
Use Now →Macro Calculator
Free online macro calculator using the Mifflin-St Jeor equation. Calculate your daily protein/carbs/fat needs for weight loss, muscle gain, or mainten
Use Now →Markdown Table to CSV Converter
Free online Markdown table to CSV converter. Convert Markdown tables to CSV/TSV/JSON. Supports pipe and plain text tables.
Use Now →Markup Calculator
Free online markup calculator. Calculate markup percentage, selling price, cost, and profit. Supports markup vs margin conversion. Perfect for pricing
Use Now →Markup Calculator - Calculate Markup Percentage & Selling Price Online
Free online markup calculator. Calculate markup percentage, selling price, cost, and profit. Supports markup vs margin…
Use Now →Matrix Calculator Online
Free online matrix calculator for 2x2, 3x3, 4x4 matrices. Add, subtract, multiply, transpose, inverse, determinant. Real-time results.
Use Now →Midpoint Calculator
Free online midpoint calculator. Enter two points to find the midpoint of a line segment. Supports 2D and 3D coordinates. Shows formula and steps. Cli
Use Now →Midpoint Calculator
Free online midpoint calculator. Enter two points to find the midpoint of a line segment. Supports 2D and 3D coordinates. Shows formula and steps.
Use Now →Midpoint Calculator - Find Midpoint Coordinates Online
Free online midpoint calculator. Enter two points to find the midpoint of a line segment. Supports 2D and 3D coordinat…
Use Now →Mole Calculator
Free online mole calculator. Convert between mass, moles, and number of molecules. Supports common chemical compounds with built-in molar masses. Clie
Use Now →Mole Calculator
Free online mole calculator for chemistry. Calculate molar mass, moles, mass, and number of molecules.
Use Now →Net Worth Calculator
Free online net worth calculator. Calculate your personal or family net worth instantly. Enter assets (cash, home, investments, vehicle) and liabiliti
Use Now →Number Base Converter Online
Free online number base converter supporting conversions between binary, octal, decimal, hexadecimal, and any base from 2 to 36. Real-time conversion,
Use Now →Number to Words Converter
Free online number to words converter. Convert Arabic numerals to English words, uppercase, currency format, and ordinals. Pure frontend processing, n
Use Now →Octal Decimal Converter
Free online number base converter. Convert between octal, decimal, binary, and hexadecimal. Includes reference table for 0-32. Client-side processing,
Use Now →Ohm's Law Calculator
Free online Ohm's Law calculator. Enter any two electrical values (V/I/R/P) to calculate the rest. Client-side computation, essential for electronics
Use Now →Ohm's Law Calculator Online
Free online Ohm's Law calculator. Enter any two electrical values (V/I/R/P) to calculate the rest. Client-side computation, essential for electronics
Use Now →Online Age Calculator
Free online age calculator that computes exact age in years, months, and days. Supports zodiac sign, Chinese zodiac, and life statistics. Pure fronten
Use Now →Online Aspect Ratio Calculator
Free online Aspect Ratio Calculator. Calculate aspect ratios from width & height, reverse-calculate dimensions from ratios, with built-in presets for
Use Now →Online Business Day Calculator
Free online business day calculator. Quickly count working days between two dates with custom holidays and weekend settings. Pure client-side processi
Use Now →Online CSV Table Editor
Free online CSV table editor with visual editing, sorting, filtering, add/delete rows and columns, and export to CSV/TSV/JSON. Pure client-side proces
Use Now →Online Data Storage Unit Converter
Free online data storage unit converter. Convert between bytes, KB, MB, GB, TB, PB, EB, ZB, YB and more. Supports both SI (decimal) and IEC (binary) s
Use Now →Online Data URL Converter - File/Image ↔ Base64 Data URL · Free
Online Data URL Converter - File/Image ↔ Base64 Data URL · Free
Use Now →Online Date Calculator
Free online date calculator with date difference, date addition/subtraction, business days, age calculation, and countdown features. Pure client-side
Use Now →Online File Size Converter
Free online file size converter. Convert between B/KB/MB/GB/TB/PB with binary (1024) and decimal (1000) switching. Real-time calculation, pure fronten
Use Now →Online Grade Calculator
Free online grade calculator supporting weighted average and GPA calculation. Compatible with 4.0-scale, 5.0-scale and custom grading standards. Pure
Use Now →Online Hex Calculator
Free online hexadecimal calculator, supports addition, subtraction, multiplication, division, AND, OR, XOR operations. Toggle between hex and decimal
Use Now →Online Hex Converter
Free online Hexadecimal converter tool. Convert text to hex, hex to text, and files to hex with multiple format options. Pure client-side processing,
Use Now →Online IP Subnet Calculator
Free online IP subnet calculator for IPv4. Supports CIDR calculation, subnet division, network/broadcast address lookup. Pure frontend, no data sent t
Use Now →Online Morse Code Converter
Free online Morse code converter with text↔code bidirectional conversion, audio playback, and flashing visual demo. Pure frontend, no data sent to ser
Use Now →Online Number Base Converter
Free online number base converter supporting text ↔ binary, hex, octal, and decimal conversion. Pure frontend, data never leaves your browser. Multipl
Use Now →Online Ovulation Calculator
Free online ovulation calculator. Based on your last menstrual period and average cycle length, accurately predict ovulation days, fertile window, saf
Use Now →Online PPI Pixel Density Calculator
Free online PPI pixel density calculator. Calculate PPI/DPI from screen size and resolution, check Retina standard, viewing distance recommendations,
Use Now →Online Scientific Calculator
Free online scientific calculator with trigonometric, logarithmic, power, factorial, constants π/e and more. Real-time pure frontend calculation with
Use Now →Online Time Zone Converter - Worldwide Time Zone Conversion · Free
Online Time Zone Converter - Worldwide Time Zone Conversion · Free
Use Now →Online Timer - Countdown & Stopwatch · Custom Time · Browser Notifications · Free
Online Timer - Countdown & Stopwatch · Custom Time · Browser Notifications · Free
Use Now →Online Unicode Encoder & Decoder
Free online Unicode encoder and decoder. Convert text to/from Unicode escape sequences, HTML entities, and UTF-8 bytes. Pure client-side processing, n
Use Now →Online Unit Converter
Free online unit converter supporting real-time conversion of common units including length, weight, temperature, speed, area, and data storage. Batch
Use Now →Online Unix Timestamp Converter
Free online Unix timestamp converter. Convert timestamps and date/time, real-time display, batch, relative time, timezones. Pure frontend, one-click c
Use Now →Online VAT Calculator
Free online VAT calculator. Calculate tax-inclusive and tax-exclusive prices with preset rates for China, US, EU, Japan and more. Pure frontend, no da
Use Now →PX REM EM Converter
Free online PX REM EM PT converter. Convert between pixels, rem, em, and points. Set custom base font size, batch conversion, one-click copy. Runs 100
Use Now →PX to REM Converter Online
Free online PX to REM/EM converter with customizable base font size. Convert px to rem/em/pt in real-time. Essential for responsive web design, client
Use Now →Paint Calculator
Free online paint calculator. Enter room dimensions to estimate paint needed for walls. Supports multiple coats. Client-side only, no data upload.
Use Now →Paper Size Converter Online
Free online paper size converter. Look up A/B/C series paper sizes and convert between mm, inches, and pixels. Essential for printing and design, clie
Use Now →Password Entropy Calculator
Free online password entropy calculator. Scientifically evaluate password strength using Shannon information entropy formula. Calculate entropy in bit
Use Now →Paycheck Calculator Online
Free online paycheck calculator. Calculate gross pay, taxes, and net income. Supports hourly/monthly/annual salary conversion, tax and social security
Use Now →Percent Change Calculator
Free online percent change calculator. Quickly calculate the percentage increase or decrease between two values. Enter initial and final values to get
Use Now →Percent Change Calculator - Calculate Percentage Increase/Decrease Online
Free online percent change calculator. Quickly calculate the percentage increase or decrease between two values. Enter…
Use Now →Percentage Calculator Online
Free online percentage calculator. Calculate X% of Y, X is what % of Y, percentage change, and percentage difference. Instant results. Client-side.
Use Now →Percentage Change Calculator
Free online percentage change calculator. Calculate percent increase or decrease between two numbers. Enter original and new values, auto-calculates c
Use Now →Percentage Difference Calculator
Free online percentage difference calculator. Calculate the percentage difference between two values. Enter two numbers and get the percent difference
Use Now →Pixel Unit Converter
Free online pixel unit converter. Convert PX to CM/MM/INCH/PT with PPI/DPI accuracy. Custom resolution support. Perfect for designers and frontend dev
Use Now →Pregnancy Calculator
Free online pregnancy calculator. Track pregnancy week by week, calculate due date, trimester, and milestones. Accurate to day precision. Pure fronten
Use Now →Pregnancy Calculator · Free Online Tool
Free online pregnancy calculator. Track pregnancy week by week, calculate due date, trimester, and milestones. Accurate to day precision. Pure fronten
Use Now →Pressure Converter
Free online pressure converter. Convert between Pascal (Pa), Kilopascal (kPa), Megapascal (MPa), Bar, Standard Atmosphere (atm), mmHg, PSI instantly.
Use Now →Probability Calculator Online
Free online probability calculator for coin flips, dice rolls, combinations, and more. Real-time fraction and percentage results. Perfect for students
Use Now →Profit Margin Calculator
Free online profit margin calculator. Calculate gross margin, net margin, operating margin, cost profit margin, and markup instantly. Enter revenue, c
Use Now →Punycode Encoder/Decoder
Free online Punycode encoder/decoder. Convert Unicode domain names (e.g. 中文.cn) to Punycode (xn--fiq228c.cn) and back. Client-side processing, instant
Use Now →Pythagorean Theorem Calculator
Free online Pythagorean theorem calculator. Enter any two sides to calculate the hypotenuse, legs, angles, and area of a right triangle. Supports mult
Use Now →Quadratic Formula Calculator
Free online quadratic formula calculator. Enter coefficients a, b, c to solve ax²+bx+c=0. Shows discriminant, real roots, complex roots, and step-by-s
Use Now →Quadratic Formula Calculator
Free online quadratic formula calculator. Enter coefficients a, b, c to solve ax²+bx+c=0. Shows discriminant, real roots, complex roots, and step-by-s
Use Now →Quadratic Formula Calculator - Solve Quadratic Equations Online
Free online quadratic formula calculator. Enter coefficients a, b, c to solve ax²+bx+c=0. Shows discriminant, real roo…
Use Now →Ratio Calculator Online
Free online ratio calculator. Simplify ratios, find missing values in proportions, convert ratios. Supports integer/decimal/fraction ratios. Client-si
Use Now →Resistor Color Code Calculator
Free online resistor color code calculator. Decode 4/5/6 band resistors. Select band colors to get resistance value, tolerance, and TCR. Essential ele
Use Now →Retirement Calculator Online
Free online retirement calculator. Calculate your retirement savings, monthly withdrawal, and plan for a comfortable retirement. Client-side.
Use Now →Ring Size Converter
Free online ring size converter. Convert between US, UK, EU, JP and other ring size standards. Built-in measurement guide and size chart. Client-side
Use Now →Roman Numeral Converter
Free online Roman numeral converter. Convert Roman numerals to numbers, or numbers to Roman numerals. Range 1-3999. Pure frontend, fast and accurate.
Use Now →Running Pace Calculator
Free online running pace calculator. Calculate pace per km/mile, finish time predictions, and pace conversions across distances. Supports marathon, ha
Use Now →SQL to CSV Converter Online
Free online SQL to CSV converter. Convert SQL INSERT statements to CSV format instantly. Supports multi-row INSERT, custom delimiters. Client-side onl
Use Now →Sales Tax Calculator
Free online sales tax calculator. Add or remove tax with custom rates. Pure frontend, no upload.
Use Now →Significant Figures Calculator
Free online significant figures calculator (sig fig calculator). Count significant digits, perform sig fig arithmetic, and round to specified signific
Use Now →Simple Interest Calculator
Free online simple interest calculator. Calculate interest, total amount, and repayment schedule. Support annual, monthly, daily periods. Client-side
Use Now →Simple Interest Calculator - Calculate Simple Interest Online
Free online simple interest calculator. Calculate interest, total amount, and repayment schedule. Support annual, mont…
Use Now →Sleep Cycle Calculator
Free online sleep cycle calculator based on 90-minute sleep cycle theory. Calculate optimal bedtime or wake-up time for better sleep. Wake up refreshe
Use Now →Slope Calculator
Free online slope calculator. Enter two points to find the slope of a line. Shows slope formula, step-by-step calculation, and line equation. Client-s
Use Now →Slope Calculator
Free online slope calculator. Enter two points to find the slope of a line. Shows slope formula, step-by-step calculation, and line equation.
Use Now →Slope Calculator - Find Slope of a Line Online
Free online slope calculator. Enter two points to find the slope of a line. Shows slope formula, step-by-step calculat…
Use Now →Speed Converter
Free online speed converter. Convert between km/h, mph, knots, mach, m/s, speed of light and more. Real-time unit conversion, client-side, no data upl
Use Now →Square Footage Calculator
Free online square footage calculator for rooms, houses, and land areas. Supports rectangles, L-shapes, circles, triangles. Convert between sq ft, sq
Use Now →Statistics Calculator
Free online statistics calculator. Compute mean, median, mode, variance, standard deviation, quartiles, range, skewness and kurtosis for your data set
Use Now →Student Loan Calculator
Free online student loan calculator. Calculate monthly payments, total interest, payoff time. Compare repayment plans. Client-side.
Use Now →Student Loan Calculator
Free online student loan calculator. Calculate monthly payments, total interest, and payoff time. Compare standard, extended, and graduated repayment
Use Now →Subnet Calculator
Free online subnet calculator for IPv4 CIDR subnetting. Calculate network address, broadcast address, usable hosts, subnet mask. Supports VLSM and sup
Use Now →Surface Area Calculator
Free online surface area calculator. Calculate surface area of cube, sphere, cylinder, cone, rectangular prism, and more. Enter dimensions and get ins
Use Now →Surface Area Calculator - Calculate Area of 3D Shapes Online
Free online surface area calculator. Calculate surface area of cube, sphere, cylinder, cone, rectangular prism, and mo…se in HTML src and CSS …
Use Now →TDEE Calculator
Free online TDEE (Total Daily Energy Expenditure) calculator. Estimate daily calorie needs based on age, weight, height, and activity level. Client-si
Use Now →Temperature Converter
Free online temperature converter supporting Celsius, Fahrenheit, and Kelvin with real-time bidirectional conversion. Pure frontend, no data upload, i
Use Now →Tile Calculator
Free online tile calculator. Enter room dimensions and tile size to estimate tiles needed. Supports waste allowance. Client-side only, no data upload.
Use Now →Time Calculator Online
Free online time calculator. Add/subtract time, calculate duration between times, time unit conversion. Client-side only, no install needed.
Use Now →Time Duration Calculator
Free online time duration calculator. Calculate the time between two times or dates. Supports hours, minutes, seconds, and date differences. Client-si
Use Now →Triangle Calculator Online
Free online triangle calculator. Supports SSS, SAS, ASA, AAS, and right triangle modes. Calculate side lengths, angles, area, and perimeter automatica
Use Now →Unit Price Calculator Online
Free online unit price calculator. Calculate price per gram, per liter, per item for shopping comparison. Compare multiple products. Client-side only.
Use Now →Volume Converter
Free online volume unit converter supporting liters, milliliters, gallons, fluid ounces, cups, pints, quarts, barrels, cubic meters and more. Pure fro
Use Now →Volume Converter
Free online volume unit converter supporting liters, milliliters, gallons, fl...
Use Now →Week Number Calculator - Free Online ISO Week Number Tool
Free online week number calculator. Find the ISO week number for any date, or get the dates for any week. Pure frontend.
Use Now →Weight Converter
Free online weight converter. Convert between kilograms (kg), grams (g), pounds (lb), ounces (oz), stones (st), tons (t) and more. Instant bidirection
Use Now →Work Hours Calculator Online
Free online work hours calculator. Track work hours, overtime, and weekly totals. Daily and weekly views, standard hours comparison. Client-side only,
Use Now →⚖️ Ideal Weight Calculator
Free online ideal body weight calculator using Devine, Hamwi, Miller, and Robinson formulas. Includes BMI healthy weight range. Pure client-side calcu
Use Now →⚖️ Proportion Calculator
Free online Proportion Calculator. Solve proportion equations A:B = C:D insta...
Use Now →⚡ Electricity Cost Calculator
Free online electricity cost calculator. Enter appliance wattage, usage hours, and rate.
Use Now →⛽ Fuel Cost Calculator
Free online fuel cost calculator. Enter distance, fuel consumption, and fuel price.
Use Now →⛽ Fuel Cost Calculator
Free online fuel cost calculator. Estimate trip fuel costs based on distance,...
Use Now →✂️ CSV Splitter
Free online CSV splitter. Split large CSV files by row count or number of files. Supports header retention and custom delimiters. Pure frontend, no da
Use Now →❗ Factorial Calculator
Free online factorial calculator. Compute n! factorial, permutations P(n,r), and combinations C(n,r). Supports large number arithmetic. Pure frontend.
Use Now →在线Data URL转换器
Free online 免费在线Data URL转换器，支持文件/图片与Base64 Data URL互转。支持图片预览、文件拖拽、MIME类型自动识别。纯前端本地处理，文件不离开您的设备。
Use Now →在线Time Zone Conversion器
Free online 免费在线Time Zone Conversion器，支持全球400+时区的实时转换。输入时间自动转换为Target Time Zone，支持UTC偏移和城市名称搜索。纯前端实现，无需注册。
Use Now →在线UnixTimestamp Conversion器
Free online 免费在线UnixTimestamp Conversion器，实时转换Unix时间戳和人类可读日期时间。支持秒级和毫Seconds Timestamp，显示UTC时间、Local Time和Relative Time。纯前端实现。
Use Now →在线日期差值计算器
Free online 免费在线日期差值计算器，计算两个日期之间的Days数、Weeks数、Months数和Years数差异。支持精确到Days的计算，包含 workdays计算。纯前端实现，无需注册。
Use Now →🌍 Timezone Converter
Free online timezone converter. Quickly convert time across different time zones worldwide. Auto-detect local timezone, compare multiple timezones sim
Use Now →🎓 GPA Calculator
Free online GPA calculator supporting 4.0 scale, 5.0 scale, and percentage conversion.
Use Now →🎯 Final Grade Calculator
Free online final grade calculator. Calculate what score you need on your fin...
Use Now →🎯 Rounding Calculator
Free online rounding calculator. Round numbers to any number of decimal places with standard rounding, ceiling, floor, and truncation. Pure frontend m
Use Now →🏗️ Concrete Calculator
Free online concrete calculator. Quickly estimate concrete volume, bags needed, and cost. Supports slab, column, cylinder and footing shapes. Input di
Use Now →🏠 Mortgage Calculator
Free online mortgage calculator. Calculate monthly payments, total interest, and full amortization schedule. Supports equal payment and equal principa
Use Now →🏦 Deposit Interest Calculator
Free online deposit interest calculator for fixed deposits and installment savings. Client-side only.
Use Now →🐷 Savings Calculator
Free online savings calculator. Set a savings goal and calculate monthly deposits needed, or enter monthly deposits to see your future savings.
Use Now →🐾 Pet Age Calculator
Free online pet age calculator. Convert dog and cat years to human years. Supports small, medium, large dogs and cats. Accurate age conversion chart.
Use Now →👙 Bra Size Calculator
Free online bra size calculator. Enter your bust and underbust measurements to get your recommended size. Supports CN, US, EU and UK size standards wi
Use Now →👟 Shoe Size Converter
Free online shoe size converter. Convert between Chinese, EU, US, UK, JP and CM sizes. Supports men's, women's and children's shoe sizes with comparis
Use Now →💕 Love Compatibility Calculator
Free online love compatibility calculator. Enter two names to calculate your love match percentage using a fun algorithm. Includes cute messages, east
Use Now →💧 Daily Water Intake Calculator
Free online daily water intake calculator. Calculate recommended water consumption based on weight, exercise, climate, and other factors. Client-side
Use Now →💰 Loan Payoff Calculator
Free online loan payoff calculator. Enter loan amount, interest rate, monthly payment, and extra payment to calculate interest savings and time saved.
Use Now →💰 Margin Calculator
Free online margin calculator. Calculate gross profit margin, markup percentage, cost and revenue. Enter any two values to find the rest.
Use Now →💵 Tip Calculator
Free online tip calculator. Quickly calculate tip amounts and split bills. Enter bill total, choose tip percentage or customize, and split among any n
Use Now →💼 Salary Calculator
Free online salary calculator. Convert between hourly, daily, monthly, and annual salary instantly.
Use Now →📅 Date Calculator
Free online date calculator. Calculate days between dates, add/subtract days ...
Use Now →📅 Days Calculator
Free online days calculator. Calculate days between two dates, add or subtract days from a date, and count business days. Perfect for countdowns, proj
Use Now →📅 Week Number Calculator
Free online week number calculator. Find the ISO week number for any date, or get the start/end dates for any week number. Supports week-to-date and d
Use Now →📈 Investment Calculator
Free online investment calculator for compound interest and SIP.
Use Now →📈 ROI Calculator
Free online ROI calculator. Calculate return on investment, annualized ROI, and total gain. Perfect for investment analysis.
Use Now →📊 Body Fat Calculator
Free online body fat calculator using the U.S. Navy Method. Enter height, neck, waist measurements to calculate body fat percentage, fat mass, and lea
Use Now →📊 CSV Viewer
Free online CSV file viewer. Quickly preview CSV/TSV files. Supports large files, auto encoding detection, search, filtering, column sorting, and JSON
Use Now →📊 Logarithm Calculator
Free online logarithm calculator. Compute logarithms with any base, natural log (ln), log₂, log₁₀. Shows antilog verification. Pure frontend math tool
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Free online standard deviation calculator. Enter data to compute mean, variance, standard deviation (sample/population), min, and max. Pure frontend,
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Free online trigonometry calculator. Compute sin, cos, tan, csc, sec, and cot values. Supports both degrees and radians. Pure frontend math tool.
Use Now →📐 Area Calculator
Free online area calculator supporting circle, triangle, rectangle, square, parallelogram, trapezoid, ellipse, and regular polygon. Multiple units, cl
Use Now →📐 LCM & GCD Calculator
Free online LCM and GCD calculator. Find the least common multiple and greatest common divisor of two or three numbers. Shows step-by-step calculation
Use Now →📐 Resolution Calculator
Free online screen resolution calculator. Calculate aspect ratio, total pixels, PPI and diagonal size from width and height. Reverse-calculate dimensi
Use Now →📐 Responsive Font Size Calculator
Free online responsive font size calculator using CSS clamp(). Set min/max font sizes and viewport ranges to generate fluid typography CSS. Supports P
Use Now →📐 Z
Free online Z-score calculator. Enter a value, mean, and standard deviation to compute the Z-score. Supports normal distribution probability lookup. P
Use Now →📝 Final Exam Calculator
Free online final exam calculator. Enter current grade, final exam weight, and target grade.
Use Now →📦 Shipping Cost Calculator
Free online shipping cost calculator. Estimate delivery costs based on package weight and distance.
Use Now →📦 Volume Calculator
Free online volume calculator supporting sphere, cube, cuboid, cylinder, cone, frustum, and prism shapes. Multiple units, client-side only, privacy sa
Use Now →📷 Depth of Field Calculator
Free online Depth of Field (DOF) calculator. Calculate DOF based on focal len...
Use Now →📸 Exposure Triangle Calculator
Free online exposure triangle calculator. Calculate equivalent exposure value...
Use Now →🔄 CSV Transpose Tool
Free online CSV transpose tool. Swap rows and columns in CSV data with custom delimiters and header options. Pure frontend, no data upload.
Use Now →🔐 Chmod Calculator
Free online Unix/Linux file permission calculator. Convert between symbolic mode (u=rwx,g=rx,o=r) and numeric mode (755). Visual permission bit viewer
Use Now →🔢 Binary Calculator
Free online binary calculator. Supports binary arithmetic, bitwise operations (AND/OR/XOR/NOT/shift), and base conversion. Client-side processing, pri
Use Now →🖨️ Photo Print Size Calculator
Free online print size calculator. Calculate maximum print sizes based on ima...
Use Now →🚀 Speed Converter
Free online speed converter. Convert between km/h, mph, knots, mach, m/s, spe...
Use Now →🥄 Baking Conversion Calculator
Free online baking conversion calculator. Convert cups, tablespoons, and teas...
Use Now →🥘 Cooking Converter
Free online cooking measurement converter. Convert between cups, tablespoons, teaspoons, ml, grams, and ounces for various ingredients like flour, sug
Use Now →🧪 Mole Calculator
Free online mole calculator. Convert between mass, moles, and number of molec...
Use Now →🧾 Sales Tax Calculator
Free online sales tax calculator. Enter amount and tax rate to calculate total price with tax and tax amount. Supports add-tax and remove-tax modes. P
Use Now →Frequently Asked Questions
How accurate are these calculators?
Our calculators use standard mathematical formulas and JavaScript's IEEE 754 double-precision arithmetic. Results are accurate to at least 15 significant digits for most calculations.
Can I use these for professional work?
Yes. While we recommend double-checking critical financial or engineering calculations, our tools use the same formulas used in professional applications.
Do the calculators store my data?
No. All calculations happen in your browser. Your input data is never sent to any server and is not stored anywhere after you close the page.