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.
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For optional supporting equipment or reference material, you can browse Undated calendars and planners (paid link) on Amazon.com. Record the dates and counting choices used in your calculation. Check local holidays, time zones and official deadlines independently. No purchase is required to use this calculator.
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.
Worked example: Business Days
Enter the following values in the Business Days Calculator and calculate to reproduce this result. Dates below use year-month-day order.
- Start date: 2026-10-05
- End date: 2026-10-09
- Boundary counting: Include start and end
- U.S. Federal holidays: Do not exclude holidays
Example result: 5 days. The selected range contains 5 counted business days under your selected options.
Calculation used: Business days = counted boundary dates − weekends
How to interpret this example
The example includes both boundary dates and counts Monday through Friday. It does not subtract holidays under the selected option. Changing either endpoint inclusion or the holiday setting can change a deadline even when the dates stay the same.
Frequently asked questions
Sources and methodology
This calculator uses transparent browser-side date/time arithmetic. The references below provide standards or official context relevant to the calculation.