Business Days Calculator - Count Working Days Online
This free online business days calculator helps you quickly determine the number of working days between two dates, excluding weekends (Saturday and Sunday) and custom holidays. Whether you need to calculate project delivery dates, contract fulfillment days, or plan work schedules, this tool provides accurate results instantly.
Key Features
- Calculate between dates: Enter start and end dates to get the exact count of business days excluding weekends
- Add business days: Find the future date after adding a specific number of business days
- Subtract business days: Find the past date before subtracting a specific number of business days
- Quick presets: Jump to This Week, This Month, This Quarter, or This Year with one click
- US Federal Holidays: Load 2025-2026 US holidays instantly with one click
- Custom holidays: Add company holidays, public holidays, or any dates to exclude
- Privacy first: All calculation happens in your browser, nothing is uploaded
Use Cases
Project deadline planning, contract delivery date calculation, employee leave day counting, government processing time estimation, exam preparation planning, and more.
Frequently Asked Questions
How do I use the business days calculator?
Select a start date and end date, then click Calculate to get the number of business days between them (excluding weekends). You can also use the Add or Subtract Business Days mode to find the date before or after N business days.
Does it include the start date?
Yes. The calculation includes the start date but excludes the end date. For example, Monday to Friday with start on Monday and end on next Monday equals 5 business days.
What counts as a business day?
Monday through Friday, excluding weekends (Saturday and Sunday). You can also add custom holidays to exclude specific dates.
Can I add custom holidays?
Yes. Enter holiday dates in the holidays field, one per line in YYYY-MM-DD format. You can also load US Federal Holidays for 2025-2026 with one click.
How to calculate project deadline?
Enter your project start date, then switch to "Add Business Days" mode. Input the number of business days your project requires. The calculator will show the exact deadline date, excluding weekends and any holidays you specify.
Business days vs calendar days conversion?
Calendar days include every day (weekends and holidays), while business days only count Monday through Friday excluding holidays. For example, 10 calendar days might equal only 7-8 business days depending on weekends and holidays in the period.
Which countries' holidays are supported?
The tool comes with US Federal Holidays for 2025-2026 preloaded. You can add any country's holidays manually by entering the dates in YYYY-MM-DD format, one per line. This makes it flexible for international use.
Is the calculation accurate?
Yes. The calculation is performed entirely in your browser using reliable date arithmetic. It correctly handles month boundaries, leap years, and holiday exclusions. All processing is 100% client-side for both accuracy and privacy.