🧮 Free Online Calculator Tools 202 tools

★★★★½ 4.8 (12350 ratings)

🧮 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, privacy safe. 🧮 Decimal to Hex Converter Free online Decimal to Hex converter. Convert decimal numbers to hexadecimal. Supports integers, decimals, and negative numbers. Real-time bidirectional conversion. Client-side only. 🧮 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, private. 🧮 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 engineering. 🧮 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 frontend, private. 🧮 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 electronics tool. 🧮 Loan Payoff Calculator Free online loan payoff calculator. Calculate interest savings and time saved with extra payments. Pure frontend. 🧮 Sales Tax Calculator Free online sales tax calculator. Add or remove tax with custom rates. Pure frontend, no upload. 🧮 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 frontend, no data upload. 🧮 Amortization Calculator Free online amortization calculator. Generate a full loan amortization schedule with monthly payment breakdown. Enter loan amount, interest rate, and term. Shows principal vs interest per period. Clie 🧮 Angle Converter Free online angle converter. Convert between degrees (°), radians (rad), gradians (grad), arcminutes ('), arcseconds (\ 🧮 APY Calculator Free online APY calculator. Calculate Annual Percentage Yield with various compounding frequencies. Real-time results. Client-side. 🧮 📐 Area Calculator Free online area calculator supporting circle, triangle, rectangle, square, parallelogram, trapezoid, ellipse, and regular polygon. Multiple units, client-side only. 🧮 Area Converter Free online area unit converter supporting square meters, square kilometers, hectares, acres, square feet, square yards, and 15+ area units. Pure frontend conversion, no data uploaded to server. 🧮 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 video, image, and screen ratios. Pure frontend, da 🧮 Audio Converter 🧮 Auto Loan Calculator Free online auto loan calculator. Calculate monthly payments, total interest, and total cost. Full amortization schedule. Client-side. 🧮 Average Calculator Free online average calculator. Compute mean, median, mode, and range for any set of numbers. Real-time statistics. Client-side. 🧮 Online Number Base Converter Free online number base converter supporting text ↔ binary, hex, octal, and decimal conversion. Pure frontend, data never leaves your browser. Multiple encoding formats supported. 🧮 BMI Calculator Online Free online BMI calculator. Calculate your Body Mass Index instantly with metric/imperial unit switching. Get BMI classification, health recommendations, and ideal weight range. Pure frontend calculat 🧮 BMR Calculator Free online BMR (Basal Metabolic Rate) calculator using Harris-Benedict and Mifflin-St Jeor equations. Calculate daily calorie needs, get weight management advice. Pure frontend, no data upload. 🧮 📊 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 lean body mass. Client-side only, no upload. 🧮 👙 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 with detailed size charts and measuring guide. 🧮 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. Client-side, no data upload. 🧮 Brick Calculator Free online brick calculator. Enter wall dimensions to estimate bricks needed and mortar volume. Supports multiple brick types. Client-side only, no data upload. 🧮 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 processing, no data upload. 🧮 Free OnlineCAGRCalculatetool Free online Bitwise Calculator tool. Pure client-side processing, no registration required. 🧮 Calorie Calculator Free online calorie calculator. Calculate your BMR (Basal Metabolic Rate) and TDEE (Total Daily Energy Expenditure). Get personalized calorie and macronutrient recommendations. Pure frontend, no data 🧮 Calories Burned Calculator Free online calories burned calculator. Scientifically estimate calories burned for 100+ exercises using MET values. Enter weight and duration. Client-side only. 🧮 Carbon Footprint Calculator Online Free online carbon footprint calculator. Estimate your annual CO2 emissions from travel, energy, diet, and lifestyle. Client-side only. 🧮 Case Converter Free online case converter tool. Convert text to UPPERCASE, lowercase, Capitalized, camelCase, PascalCase, snake_case, SCREAMING_SNAKE and more. Real-time preview, one-click copy, pure frontend. 🧮 🔐 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 with one-click command copy. Perfect for sysadmin 🧮 CIDR Subnet Calculator Free online CIDR subnet calculator. Calculate network address, broadcast address, usable IP range, subnet mask from CIDR notation. Pure client-side IPv4 subnetting. 🧮 Circle Calculator Online Free online circle calculator. Enter radius, diameter, circumference, or area to calculate all values. Shows formulas and calculations. Essential geometry tool, client-side. 🧮 Combination & Permutation Calculator Free online combination and permutation calculator. Calculate nCr (combinations) and nPr (permutations) with step-by-step solutions. Supports large numbers and shows formulas. 🧮 Compound Interest Calculator Free online compound interest calculator with recurring contributions, visual growth charts, and detailed yearly breakdowns. All calculations run locally in your browser with no data sent to servers. 🧮 🏗️ Concrete Calculator Free online concrete calculator. Quickly estimate concrete volume, bags needed, and cost. Supports slab, column, cylinder and footing shapes. Input dimensions and concrete grade for accurate material 🧮 🥘 Cooking Converter Free online cooking measurement converter. Convert between cups, tablespoons, teaspoons, ml, grams, and ounces for various ingredients like flour, sugar, butter, milk, and water. Real-time conversion 🧮 Correlation Calculator Free online Pearson correlation coefficient calculator. Compute r value with scatter plot and trend line. Statistical analysis tool, pure frontend. 🧮 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 polynomial. Client-side processing, no data upload 🧮 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 investment. Client-side. 🧮 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 processing, no data upload. 🧮 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), multiple condition combinations (AND/OR), dupli 🧮 ✂️ 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 data upload. 🧮 CSV to Excel Free online CSV to Excel (XLSX) converter. Quickly transform CSV files into downloadable Excel spreadsheets. Supports custom delimiters, encoding options, and header row detection. Powered by SheetJS 🧮 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 frontend, no data uploads. 🧮 CSV to Markdown Table Converter Online Free online CSV to Markdown table converter. Generate GitHub-flavored Markdown tables from CSV data. Client-side processing. 🧮 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-side only, no uploads. 🧮 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 delimiter preview, and batch conversion. Pure fron 🧮 🔄 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. 🧮 📊 CSV Viewer Free online CSV file viewer. Quickly preview CSV/TSV files. Supports large files, auto encoding detection, search, filtering, column sorting, and JSON export. Client-side only, no upload. 🧮 Baking Conversion Calculator Free online baking conversion calculator. Convert cups, tablespoons, and teaspoons to grams and ml for flour, sugar, butter, milk, and more ingredients. Client-side tool. 🧮 Currency Converter Free online currency converter. Convert between 40+ world currencies including USD, EUR, CNY, JPY, GBP. Built-in reference rates. Client-side only. 🧮 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 conversion. Client-side. 🧮 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) standards. Pure frontend, no data uploaded. 🧮 OnlineData URLConverttool Free online Free OnlineData URLConverttool，supportsfile/imageandBase64 Data URL convert.supportsimagePreview、filedrag、MIMETypeautodynamic .，filenot open device. 🧮 Online Date Calculator Free online date calculator with date difference, date addition/subtraction, business days, age calculation, and countdown features. Pure client-side processing. 🧮 OnlineDatediffvalueCalculatetool Free online Free OnlineDatediffvalueCalculatetool，Calculate Datebetween Daysnumber、Weeksnumber、MonthsnumberandYearsnumberdiffabnormal.supportsexacttoDays Calculate，contains workdaysCalculate.Pure Frontendimplement，No Signup Required. 🧮 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-side only. 🧮 📅 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, project planning, anniversaries, and deadline tracking 🧮 🏦 Deposit Interest Calculator Free online deposit interest calculator for fixed deposits and installment savings. Client-side only. 🧮 Discount Calculator Online Free online discount calculator. Calculate sale price, savings amount and discount percentage. Supports percentage off, fixed amount off, multi-item discounts. Client-side only. 🧮 Distance Calculator Free online distance calculator. Enter 2D or 3D coordinates to calculate the Euclidean distance between two points. Shows step-by-step solution. Client-side. 🧮 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/Kbps/Mbps/Gbps unit conversion. Pure frontend, no up 🧮 ⚡ Electricity Cost Calculator Free online electricity cost calculator. Enter appliance wattage, usage hours, and rate. 🧮 Energy Converter Free online energy converter. Convert between Joules (J), Kilojoules (kJ), Calories (cal), Kilocalories (kcal), Kilowatt-hours (kWh), Electronvolts (eV), and BTU. Client-side. 🧮 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 options (UTF-8/GBK). Pure frontend processing, no serv 🧮 ❗ Factorial Calculator Free online factorial calculator. Compute n! factorial, permutations P(n,r), and combinations C(n,r). Supports large number arithmetic. Pure frontend. 🧮 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 frontend. 🧮 📝 Final Exam Calculator Free online final exam calculator. Enter current grade, final exam weight, and target grade. 🧮 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 multiple courses. Client-side tool. 🧮 Font Size Converter Free online font size converter. Convert between PX, EM, REM, PT, and Percent instantly. Essential for responsive web design. 🧮 Fraction Calculator Free online fraction calculator. Add, subtract, multiply, and divide fractions with step-by-step solutions. Simplify fractions and convert to decimals and percentages. 🧮 Frequency Converter Free online frequency converter. Convert between Hz, kHz, MHz, GHz, THz, RPM, and rad/s instantly. Client-side processing, no data upload. 🧮 ⛽ Fuel Cost Calculator Free online fuel cost calculator. Enter distance, fuel consumption, and fuel price. 🧮 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, no data upload. 🧮 Fuel Efficiency Converter Free online fuel efficiency converter. Convert between MPG (US/UK), km/L, and L/100km instantly. Client-side, no upload. 🧮 Full Free online full-width and half-width character converter. Convert between full-width and half-width characters including letters, numbers, punctuation, and spaces. Pure frontend, no data upload. 🧮 🎓 GPA Calculator Free online GPA calculator supporting 4.0 scale, 5.0 scale, and percentage conversion. 🧮 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 frontend, local processing, no data uploaded to se 🧮 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 running, cycling, cardio. 🧮 Height Converter Online Free online height converter. Convert between cm, feet, and inches instantly. Real-time bidirectional conversion with reference chart. Client-side only. 🧮 Online Hex Calculator Free online hexadecimal calculator, supports addition, subtraction, multiplication, division, AND, OR, XOR operations. Toggle between hex and decimal display. Pure frontend. 🧮 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, no data upload. 🧮 Home Affordability Calculator Free online home affordability calculator. Calculate how much house you can afford based on income, down payment, and debts. Client-side. 🧮 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 Windows app icons. 🧮 ⚖️ Ideal Weight Calculator Free online ideal body weight calculator using Devine, Hamwi, Miller, and Robinson formulas. Includes BMI healthy weight range. Pure client-side calculation. 🧮 Inflation Calculator Free online inflation calculator. Calculate future purchasing power, money devaluation, and compare different inflation scenarios. Client-side only. 🧮 📈 Investment Calculator Free online investment calculator for compound interest and SIP. 🧮 IP Subnet Calculator Free online IP subnet calculator. Calculate IPv4 subnet information including network address, broadcast address, host range, and CIDR notation. Pure frontend. 🧮 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 to servers. 🧮 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 addresses, validate IP address formats. Pure frontend proc 🧮 📐 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. Pure frontend. 🧮 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-side. 🧮 Leet Speak Converter Free online Leet Speak (1337 5p34k) converter. Transform plain text into leet style with multiple conversion levels (basic/intermediate/advanced). Pure frontend, no data upload. Perfect for internet c 🧮 Length Converter Free online length converter. Convert between meters (m), kilometers (km), centimeters (cm), millimeters (mm), feet (ft), inches (in), yards (yd), miles (mi) and more. Instant bidirectional conversion 🧮 Loan Calculator Online Free online loan calculator. Equal installment and equal principal methods. Calculate monthly payment, total interest, total payment, amortization schedule. 🧮 📊 Logarithm Calculator Free online logarithm calculator. Compute logarithms with any base, natural log (ln), log₂, log₁₀. Shows antilog verification. Pure frontend math tool. 🧮 💕 Love Compatibility Calculator Free online love compatibility calculator. Enter two names to calculate your love match percentage using a fun algorithm. Includes cute messages, easter eggs, and romantic quotes. Perfect for couples, 🧮 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 maintenance. Supports metric and imperial units. Pure cli 🧮 💰 Margin Calculator Free online margin calculator. Calculate gross profit margin, markup percentage, cost and revenue. 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