How to use this calculator
Choose which weekday numbers are non-working days and enter excluded holiday dates. Count mode includes an eligible start date and follows the end-date option. Offset mode starts counting after the start date.
- Enter task, start date, end date and review the remaining options.
- Select Calculate or change a value to update the result. Read the result label and units before copying.
- Use Reset to restore the worked starting values.
Formula and method
No regional preset is selected automatically. Optional US nationwide federal holiday pattern supports 2021–2099 and projects current rules, excluding DC-only Inauguration Day. Future law changes and employer-specific observances are not predicted. Up to 100 calendar years for counting and 36,600 working days for offsets.
Worked example
January 1–8, 2024 contains 5 weekdays when the end is excluded.
Questions about business days calculator
Are public holidays excluded automatically?
The default excludes weekends without assuming local holidays. Customize the weekend days and enter holidays as YYYY-MM-DD, or explicitly choose the US federal preset within its supported years. Endpoint controls determine which eligible dates count; a holiday already on an excluded weekend is not counted twice.
What assumptions should I check?
No regional preset is selected automatically. Optional US nationwide federal holiday pattern supports 2021–2099 and projects current rules, excluding DC-only Inauguration Day. Future law changes and employer-specific observances are not predicted. Up to 100 calendar years for counting and 36,600 working days for offsets.
Are my inputs saved?
Calculations run in your browser. We store only tool IDs for favorites and recent tools. A calculation link contains your inputs only when you explicitly choose to copy one.