Working-day arithmetic

Business days calculator

Count workdays between two dates or move a deadline by business days. Weekends and verified U.S. or Canadian national holidays can be excluded automatically.

Workdays in this range

21 business days

From Thursday, September 24, 2026 through Saturday, October 24, 2026. Both endpoints are eligible to count.

Business days21
Weekend days9
Holiday weekdays1
Calendar dates checked31
Counting rules

How business-day counting works

Weekdays

Monday through Friday count unless the selected holiday calendar marks the date as a national holiday.

Observed holidays

When a fixed holiday falls on a weekend, its cataloged weekday observance is excluded. The weekend date remains classified as a weekend.

Endpoints

Between-date mode lets you include or exclude each endpoint. Add/subtract mode excludes the starting date unless you choose to count it.

A five-day example

Monday, March 2 through Friday, March 6 contains five business days when both endpoints count. Excluding Monday makes the same range four business days.

U.S. and Canadian coverage

The holiday options remove U.S. federal or Canadian national holidays. State, provincial, local, company, school, and market closures are not removed automatically.

Calendar days versus workdays

Use this calculator for payroll periods, shipping windows, and weekday deadlines. To move by every calendar day instead, use add or subtract dates.