Business Days Calculator
Count working days between two dates.
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Deadlines, delivery windows, and service-level agreements are usually measured in business days — Monday to Friday, weekends excluded. This calculator counts them exactly between any two dates, so a '10 business days' promise doesn't catch you out.
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How to Count Business Days — The Quick Answer
Count every day between the two dates except Saturdays and Sundays. A week contributes five business days, so a span of three weeks is fifteen working days — before subtracting any public holidays.
Shortcut
business days = total calendar days − weekend days (Saturdays + Sundays)
Calendar days vs business days
| Span | Calendar days | Business days |
|---|---|---|
| 1 week | 7 | 5 |
| 2 weeks | 14 | 10 |
| 1 month (30 days) | 30 | ~22 |
| 1 year | 365 | ~261 |
This counts Monday–Friday and excludes weekends. It does not remove public holidays — a '10 business days' estimate often includes one, so subtract your local holidays for an exact working-day total.
How It Works
The Method
Calendar days minus weekends
Formula
business days = calendar days − (Saturdays + Sundays)
Variables
The weekly shortcut
Each full week contributes exactly 5 business days. Multiply the number of whole weeks by 5, then add the weekdays in any leftover days.
Not included
This counts weekends only. Public holidays fall on weekdays and are treated as working days here, so a period spanning a bank holiday will over-count by one per holiday — subtract them manually.
Note: Business-day definitions vary: some countries treat Saturday as a working day, and some contracts count the start or end date differently. Confirm the convention your deadline uses.
Last updated: October 5, 2026
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Frequently Asked Questions
How do you count business days between two dates?
Count every day in the range except Saturdays and Sundays. For example, from a Monday to the following Friday is 5 business days; two full weeks is 10. This calculator does the count for you and also shows the total calendar and weekend days.
Does this exclude public holidays?
No — it excludes weekends only. Public holidays usually fall on weekdays, so they're counted as business days here. If a deadline spans a bank holiday, subtract one business day per holiday for an exact total, since those don't count as working days either.
What counts as a business day?
By the most common definition, Monday through Friday, excluding weekends. Some industries and countries include Saturday as a working day, and banks often define business days as days the banks are open (which also excludes public holidays). Check your specific contract or country's convention.
Are the start and end dates included?
This calculator includes the start date but not the end date — the standard convention for 'how many business days until' a deadline. If your situation counts differently, phrase it as the interval you need and pick the dates accordingly.