Business Days Calculator
Count Monday–Friday dates between a start and an end.
Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Excludes the start date, includes the end date, excludes weekends. Public holidays are not subtracted.
Example Calculation
- Start date: 2026-01-05
- End date: 2026-01-12
Monday 5 January to Monday 12 January 2026 contains 5 counted weekdays.
Frequently asked questions
How do I use this calculator?
Enter start date, end date. The result updates automatically. Use Reset to restore the example values.
What method does it use?
Count weekdays after the start date up to and including the end date.. Excludes the start date, includes the end date, excludes weekends. Public holidays are not subtracted.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.