Business Days Calculator
Count business days between dates, or add and subtract business days from a date.
Calculation type
The start date is day 0. Counting begins with the next or previous business day. With 0 business days, the start date is returned even if it is a weekend or holiday.
Choose days off that repeat each week. Enter specific dates under Additional holidays.
Result
Check how one added holiday changes the count
With the default Saturday and Sunday days off, from 2026-09-04 to 2026-09-11, excluding the start and including the end, the result is five business days. Adding 2026-09-09 as a holiday reduces it to four. To find a date from a business-day count, switch to “Add / subtract business days.”
About this tool
Choose between counting business days in a range and moving forward or backward by a set number of business days. In add / subtract mode, the start date is day 0.
Selected weekly days off and additional holidays are excluded. Saturday and Sunday are selected by default. Public holidays are not added automatically, so enter the dates that apply to you.
Frequently asked questions
Are public holidays removed automatically?
No. Add the holidays you want to exclude; the tool does not assume a country.
Can I exclude either endpoint?
Yes. Start and end dates have separate inclusion options.
Is the start date counted when adding or subtracting?
No. The start date is day 0, and the next or previous business day is day 1. With 0 business days, the start date is returned unchanged.
Are custom holidays saved?
No. The entered dates are not stored.
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