Business Days Calculator
Count working days in a date range without hiding the choices that matter: endpoint inclusion, weekend pattern and whether observed U.S. federal holidays are removed.
Start excluded; end included. Saturday and Sunday and current U.S. federal holidays are excluded.
Context matters.
- The U.S. federal option follows the current statutory holiday pattern and normal Friday/Monday observance for fixed-date holidays.
- It is not a historical calendar and does not include one-off executive closures, inauguration day, state holidays, local holidays, exchange holidays or an employer's own schedule.
Sources & scope
The calculation guide and this source trail show what the result means, where the rule came from and when it was last reviewed. This is source-and-calculation QA, not a claim of medical, legal, tax or other professional review; time-sensitive decisions still belong with the linked authority.
A business-day count with no invisible convention.
The tool first applies the selected endpoint rule, then removes weekend dates and eligible holiday dates. Every exclusion count remains visible in the result.
- 01Set the range
Choose a start date and an end date in chronological order.
- 02Choose endpoint treatment
Include or exclude the start and end independently instead of relying on an unstated convention.
- 03Apply closures
Choose the weekend pattern and either the observed U.S. federal holiday calendar or no holiday exclusions.
For fixed-date federal holidays, Saturday normally observes Friday and Sunday normally observes Monday. Dynamic Monday/Thursday holidays are generated by rule.
One-off executive closures, inauguration day, state/local holidays, courts, exchanges and employer-specific closures are outside this calendar.
Saturday/Sunday is the default, with Friday/Saturday and Sunday-only patterns available for planning contexts that use them.
Rule set 2.0.0. Last reviewed 2026-08-22. Next review due 2027-02-22.
What to know before using the result.
How are business days counted?
CalcSpan applies your start/end inclusion choices, then excludes the selected weekend dates and, if enabled, dates in the current U.S. federal holiday pattern.
Does the business days calculator include federal holidays?
Yes by default, including normal Friday/Monday observance for fixed-date holidays. You can turn holiday exclusions off.
Does it include state holidays or company holidays?
No. State, local, court, exchange and employer calendars can differ and should be checked separately.
Can the start date count as business day one?
Yes. Turn on Include the start date. The date counts only if it is not a selected weekend or excluded holiday.