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Business Days Calculator

Business Days Calculator

Count weekdays between two dates with inclusive counting options and optional U.S. Federal holiday exclusions using observed-day rules. Browse more tools in our Date & Time Calculators collection.

✓ Browser-based✓ No sign-up✓ Clear breakdown✓ Copy / Download / Print

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Enter your details

Fields start empty so you can calculate your own date or time scenario. Review the inputs before relying on the result.

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What counts as a business day here?

This calculator treats Monday through Friday as standard business days and can additionally exclude the observed U.S. Federal holidays generated by its holiday rules.

How are Federal holidays observed?

For the common Monday-Friday Federal schedule, a holiday falling on Saturday is generally observed on Friday and a holiday falling on Sunday is generally observed on Monday. The calculator applies this observed-date convention.

Does this match every employer schedule?

No. Private employers, schools, financial markets, states and local governments can use different holiday calendars and workweeks.

Can the start and end dates both count?

Yes. Choose whether to include both boundaries, only one boundary, or neither boundary.

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Frequently asked questions

Yes. Saturday and Sunday are excluded from the standard business-day count.
Yes. The Federal-holiday option applies the standard nationwide Federal holiday set and observed-day rules.
No. Inauguration Day has special geographic and scheduling rules, so it is not included in the general nationwide holiday set.
No. Employer, market and local holiday calendars can differ.
Yes. Boundary counting is selectable.
The calculator rejects reversed date ranges so the working-day direction stays clear.
No. The calculator uses built-in Federal holiday rules and should be checked against current OPM schedules for important decisions.
It can help with planning, but official payroll, banking and filing deadlines should be checked with the applicable provider or authority.

Sources and methodology

This calculator uses transparent browser-side date/time arithmetic. The references below provide standards or official context relevant to the calculation.

U.S. OPM — Federal HolidaysOfficial U.S. Federal holiday schedules and observed-day rules.ISO — ISO 8601 date and time formatInternational standard context for unambiguous Gregorian dates, times, UTC and intervals.
Date and time scope: Calendar, time-zone, holiday and scheduling conventions can differ by jurisdiction or organization. Check authoritative rules when a deadline, legal right, payroll event or travel schedule depends on the exact result.
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