Business Days Calculator
Count working days between dates with your own weekends and holidays.
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When to use business days calculator
- Estimate working days in a project period.
- Compare office calendars with different weekends.
How it works
Count the selected calendar dates, exclude selected weekend days, then subtract unique entered holidays that fall on working days. UTC calendar arithmetic avoids daylight-saving shifts.
Supported inputs and limits
No country holiday calendar is fetched. Enter holidays yourself in YYYY-MM-DD format. Duplicate holidays and holidays on weekends are deducted only once. Ranges are limited to about 100 years.
Common questions
Are public holidays automatic?
No. Enter the dates that apply to your location and organization.
Are start and end dates counted?
By default both are included. Use the two checkboxes to change that.
Methodology reviewed 2026-09-09. Processing details and test approach.