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Business Day Calculator

Subtract Business Days from a Date

Last reviewed: October 14, 2026

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Use this calculator when a deadline is fixed and you need the latest day to start. Enter the deadline, the number of business days the work needs and the country whose public holidays apply. The count runs back from the day before the deadline and skips weekends and those holidays, so the result is the latest start that still leaves that many working days before the deadline.

A worked example: an application is due on Friday, October 30, 2026, and the internal review before it takes 15 business days. Counting back on the US federal calendar gives Thursday, October 8, 2026, because Columbus Day falls in between: the latest day the draft can go into review and still clear it on the business day before the deadline. The same count works for a bid, a filing or any deliverable whose preparation is measured in working days.

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Common calculations: business days ago

5 business days ago7 business days ago10 business days ago14 business days ago15 business days ago20 business days ago21 business days ago25 business days ago28 business days ago30 business days ago45 business days ago60 business days ago90 business days ago100 business days ago120 business days ago

For informational purposes only

This calculator provides general estimates based on business day counting rules. It does not constitute legal advice. Deadlines in legal, regulatory, or contractual matters may be subject to jurisdiction-specific rules, court orders, or statutory exceptions. Always verify critical deadlines with a qualified professional.

Frequently Asked Questions

How do I find the latest start date for a fixed deadline?
Enter the deadline as the date, the working days the work needs as the number, and the country whose holidays apply. The calculator counts back from the day before the deadline, skipping weekends and those holidays, and returns the latest start. Fifteen business days before Friday, October 30, 2026 on the US federal calendar is Thursday, October 8, 2026, because Columbus Day falls in between.
How is this different from the Business Days Ago calculator?
Subtracting business days counts back from any date you choose, such as a contract or filing deadline. The Business Days Ago pages count back from today. Both use the same business-day engine; the difference is the date the count starts from.
Can I use this for press release embargo dates?
Yes, when the lead time is set in business days: subtract it from the release date to find the latest sign-off date, on the calendar of the country whose working days the lead time counts. Five business days before Friday, July 10, 2026 on the US federal calendar is Thursday, July 2, 2026, because Independence Day (observed) falls in between.
What happens to the start date if the deadline shifts by a week?
Re-enter the new deadline and the calculator counts back again with the same number of business days. With no holiday in either window, the start date moves by the same seven calendar days; a holiday that enters or leaves the window moves it by one business day more or less.
How does subtracting business days handle observed holidays?
Observed days are part of each country's holiday data. On the US federal calendar, a holiday that falls on a Saturday is observed on the Friday before and one that falls on a Sunday on the Monday after, as the Office of Personnel Management sets out, and the count skips the observed weekday: Independence Day 2026 falls on Saturday 4 July and is observed on Friday 3 July. Other countries follow their own rules, which their holiday pages describe.

Sources for these rules

Checked October 9, 2026. All sources