Business Day Calculator

Calculate business days between two dates or find a date by adding/subtracting business days. Automatically excludes weekends and optionally U.S. federal holidays.

Business days between dates:
15
business days
21
Total Calendar Days
4
Weekend Days
2
Holidays
3
Full Weeks

U.S. Federal Holidays (2025-2027)

Holiday 2025 2026 2027

How to Calculate Business Days

Business days, also known as working days or weekdays, are the days when most businesses operate. In the United States, this typically means Monday through Friday, excluding federal holidays. This calculator helps you determine the number of business days between two dates or find a specific date by adding or subtracting business days.

What Are Business Days?

Business days are typically defined as:

  • Weekdays: Monday, Tuesday, Wednesday, Thursday, and Friday
  • Excluding: Saturdays and Sundays (weekends)
  • Optionally Excluding: Public holidays recognized by businesses
Business Days Formula:

Business Days = Total Calendar Days - Weekend Days - Holidays

Where holidays fall on weekdays within the date range.

U.S. Federal Holidays

The United States recognizes 11 federal holidays each year:

  1. New Year's Day - January 1
  2. Martin Luther King Jr. Day - Third Monday of January
  3. Presidents' Day - Third Monday of February
  4. Memorial Day - Last Monday of May
  5. Juneteenth - June 19
  6. Independence Day - July 4
  7. Labor Day - First Monday of September
  8. Columbus Day - Second Monday of October
  9. Veterans Day - November 11
  10. Thanksgiving - Fourth Thursday of November
  11. Christmas Day - December 25
Note: When a federal holiday falls on a Saturday, it is usually observed on Friday. When it falls on a Sunday, it is observed on Monday. This calculator accounts for these observed dates.

Common Use Cases

  • Project Planning: Calculate delivery dates based on working days
  • Legal Deadlines: Many legal filings use business days for deadlines
  • Payment Terms: Net-10, Net-30 terms often count business days
  • HR & Payroll: Calculate work schedules and time off
  • Shipping: Estimate delivery times excluding weekends

Calculation Methods

There are two main ways to use this calculator:

  1. Days Between Dates: Enter a start and end date to find out how many business days fall between them. You can choose whether to include the end date in the count.
  2. Add/Subtract Days: Start with a date and add or subtract a specific number of business days to find the resulting date. Useful for calculating deadlines.
Pro Tip: For international business, remember that different countries have different holidays and some countries work on Saturdays. This calculator uses U.S. federal holidays, but business days may vary in other regions.

Example Calculation

If you need to calculate 10 business days from Monday, January 6, 2025:

  • Week 1 (Jan 6-10): 5 business days
  • Weekend (Jan 11-12): Skipped
  • Week 2 (Jan 13-17): 5 business days
  • Result: Friday, January 17, 2025

If Martin Luther King Jr. Day (Jan 20) fell within this range, it would extend the deadline by one day.

All Calculators