Business days calculator
Enter a start date, an end date, and the number of public holidays in the range. The calculator counts the weekdays, subtracts the holidays, and also shows the total and weekend days.
Use it to count working days between two dates, excluding weekends and holidays.
Business days
22
- Total days
- 30
- Weekend days
- 8
The result updates as you choose. The headline is the business days; the others show the total calendar days and the weekend days.
How does it work?
The range is inclusive of both dates. Weekends (Saturday and Sunday) are excluded automatically; enter the number of weekday holidays to subtract them too.
Business days formula
- weekdays
- Monday–Friday days in the range.
- holidays
- Public holidays falling on weekdays.
- business
- Working days in the range.
From a Monday to the Friday two weeks later, inclusive, is 11 weekdays; one public holiday leaves 10 business days.
Method & sources
Weekdays are Monday to Friday; weekends are Saturday and Sunday. The range includes both the start and end dates. The holiday count is subtracted from the weekday total.
Sources
Where this method comes from — use these references to understand the formula, assumptions, and limits.
- Working days conventions — International Organization for Standardization, verified 2026-06-10
How we calculate
- Weekdays are Monday to Friday; weekends are Saturday and Sunday.
- The range includes both the start and end dates.
- The holiday count is subtracted from the weekday total.
- Dates are handled in UTC to avoid timezone drift.
Rounding
Counts are whole days. The range is inclusive of both dates.
What this calculator does
Business days are the working days in a range: Monday to Friday, minus public holidays. This calculator walks each day between your two dates, counts the weekdays, and subtracts the holidays you enter to give the working-day total.
How to use it
- Pick the start date.
- Pick the end date.
- Enter the number of public holidays in the range.
- Read the business days.
A worked example
From a Monday to the Friday two weeks later, inclusive, there are 11 weekdays. Subtracting one public holiday leaves 10 business days.
Counting holidays
Only holidays that fall on a weekday reduce the business-day count — a holiday on a Saturday was already excluded as a weekend. Enter the number of weekday holidays in your range for an accurate result.
Common mistakes
- Counting holidays that land on weekends.
- Forgetting the range includes both end dates.
- Expecting it to know your country's holidays — you enter the count.
When it's useful
Working out delivery or project timelines, counting working days for leave or notice periods, or planning around a deadline.
FAQ
- How are business days counted?
- Every weekday (Monday–Friday) in the inclusive range is counted, then the number of public holidays you enter is subtracted.
- Are both dates included?
- Yes. The range counts the start date and the end date and everything in between.
- Does it know public holidays?
- No. Holidays vary by country and region, so you enter how many weekday holidays fall in the range.
- Do weekend holidays count?
- No. A holiday on a Saturday or Sunday was already excluded as a weekend, so only enter weekday holidays.
- What if I swap the dates?
- The calculator handles either order, counting from the earlier date to the later one.
- Can I share a calculation?
- Yes. Use Share to copy a link that reopens the calculator with the same dates and holidays.
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<iframe src="https://wisecalcs.com/embed/en/business-days-calculator" width="100%" height="520" style="border:0" loading="lazy"></iframe>
<p>Calculator from <a href="https://wisecalcs.com/en/time-date/business-days-calculator">WiseCalcs</a></p>