Business Days Calculator
Count working days (Monday to Friday) between two dates.
Good to know. A month has about 21 working days. We skip weekends; public holidays are on you.
How it works
In plain words
Go through every day in the range and count the ones that are Monday to Friday. Saturdays and Sundays are skipped. Public holidays are not skipped, because they depend on where you are.
The formula
business days = calendar days − Saturdays − Sundays
Worked example
From Monday 2 March 2026 to Tuesday 31 March 2026, counting the days after the start: 29 calendar days, of which 21 are business days.
Sources
- ISO 8601, Date and time format Calendar dates in the Gregorian calendar, and weeks that start on Monday.
Sources checked September 29, 2026. 7 automated tests check its answers on every change.
About the business days calculator
When a contract, a courier or a government office says "10 business days", they mean working days: Monday to Friday, not weekends. This calculator counts those days between any two dates so you know how long something really takes.
There are two ways to count, and they give different answers. For deadlines and delivery times, the usual rule is that the clock starts the day after the start date. For something like "how many working days is this project", you might want to count both the first and last day. Pick the option that matches your case. Either way, the end date itself is counted.
This version counts only weekends as non-working days. Public holidays are not removed, because they differ by country, region and even employer. If a public holiday falls on a weekday in your range, subtract it yourself. We plan to add holiday calendars later.
If your working week is different, for example Sunday to Thursday, the result will not match your calendar. For shift work, the hours between times calculator may be more useful.
Questions people ask
What counts as a business day?
Monday to Friday. Saturdays and Sundays are skipped. Public holidays are usually also excluded, but this calculator does not know your local holidays.
Does "within 5 business days" include today?
Usually not. Counting normally starts the next business day. Choose "days after the start date" for that.
How many business days are in a year?
Usually 260 or 261, before public holidays. It depends on which weekday the year starts on and whether it is a leap year.