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U.S. workday math · No spreadsheet

U.S. Business Day Calculator

Count the days that actually count.

Count workdays between dates or add and subtract business days while skipping weekends and observed federal holidays.

Your dates stay in this browser. Calculations and answer images are created locally, dates are not saved, and there is no account.Version 1.2.0: Create a polished PNG answer card with its date context and counting rules included.

01

Choose the date calculation

Start with a date range or move a specific number of workdays.

Annual holiday rules follow the U.S. Office of Personnel Management. Holiday-aware calculations support 2021–2100 and do not include one-time closures.

Your choices are remembered. Mode and checkbox preferences stay on this device; dates do not.

Ready to save

Your answer image

Created locally. The image was made in this browser and was not uploaded.

The useful details

Deadline math without the squinting.

01

Weekends come out

Saturday and Sunday are excluded from business-day totals by default.

02

Observed days matter

If a fixed federal holiday lands on a weekend, the nearby observed weekday is skipped too.

03

The rule is visible

You control whether the starting or ending date counts instead of inheriting a mystery convention.

Straight answers

Business-day questions.

What counts as a business day?

This calculator treats Monday through Friday as business days, then optionally excludes observed U.S. federal holidays. Your employer or organization may follow a different schedule.

Does the calculator include the starting and ending dates?

When counting between dates, you decide separately whether the entered start and end dates count. When adding workdays, the starting date is excluded unless you turn on “Count the starting date.” The rules used always appear beside the answer.

What does calendar span mean?

Calendar span is the full start-to-end range, including both boundary dates. “Dates counted” shows how many dates remained after your start and end choices were applied.

Which holidays are excluded?

The calculator uses the 11 annual nationwide federal holidays and their usual observed weekdays for 2021–2100, following current OPM rules. It does not add one-time federal closures. Inauguration Day is not included because it applies only to certain federal employees in the Washington, D.C. area.

Can I use this for a legal deadline?

Use it as a planning aid, not as legal advice. Courts, contracts, agencies, delivery services, and state rules can define “business day” differently.