Business Days Calculator
Calculate working days between two dates or find the date after a selected number of business days. Useful for deadlines, schedules, payment terms and project planning.
Mode
Allowed range: 1900–2100.
Allowed range: 1900–2100.
Allowed range: 1900–2100.
Use a whole number greater than 0.
Custom holidays
Holiday format: YYYY-MM-DD, one date per line. Valid holiday dates: 0.
Result
Result will appear here.
How it works
This tool calculates working days by excluding selected weekend days and any custom holiday dates you provide. It can count business days between two dates or calculate a future date after a chosen number of business days.
All calculations happen locally in your browser. No data is uploaded or stored.
Examples
Example 1 Start date: 2026-01-01 End date: 2026-01-31 Output: Business days: 22 Example 2 Start date: 2026-01-01 Business days to add: 10 Output: Result date: 2026-01-15
FAQ
What are business days?
Business days are working days that usually exclude weekends and selected holidays.
Can I exclude custom holidays?
Yes. You can enter holiday dates manually and the tool will treat them as non-working days.
Does this tool include weekends?
By default, Saturdays and Sundays are excluded, but you can adjust this with the checkboxes.
Is this calculator safe?
Yes. All calculations happen locally in your browser.