Business Days Calculator
Count the working days between two dates — Monday to Friday only — and subtract any public holidays to get the true number of business days.
Business days — working days from Monday to Friday — are how deadlines, delivery estimates and payment terms are usually counted. Because weekends and holidays don't count, the number of business days in a stretch is always less than the calendar days. This calculator counts the weekdays between two dates and lets you subtract public holidays, so you can work out true turnaround times and due dates.
How business days are counted
The tool steps through each date in the range and counts only Mondays through Fridays, then subtracts any holidays you enter. By default it counts the days after the start date; tick the box to include the start date itself.
(Saturdays and Sundays are excluded)
| Range | Business days |
|---|---|
| 1 week (Mon–Fri) | 5 |
| 2 weeks | 10 |
| 30 calendar days | ~21–22 |
| 1 year | ~260 |
Worked example
From 13 July to 13 August (about a month):
| Calendar days | 31 |
| Weekend days | 8 |
| Business days | 23 |
Why business days matter
Shipping, bank transfers, legal notice periods and service-level agreements are almost always quoted in business days, so "5 business days" from a Thursday actually lands the following Thursday, not the weekend. Holidays push it further out. When a deadline matters, count in business days and check the relevant holiday calendar — this tool lets you subtract those holidays so the result reflects your region's non-working days.