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Business Day Calculator

Add Business Days to a Date

Last reviewed: October 14, 2026

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Use this calculator when a milestone, sprint or phase is sized in working days and you need the date it lands on. Enter the start date, the number of business days and the country whose public holidays apply. The count starts on the day after the start date and steps over weekends and those holidays. The start date is never counted, whether or not it is a working day: with a Saturday and Sunday weekend, one business day from a Friday, from a Saturday or from a Sunday lands on the following Monday in each case, unless that Monday is a holiday. The result shows the date the count lands on and the number of weekend days it skipped. It does not name the holidays; to see them, enter the same two dates on the Between Dates tab, which lists them under Holidays excluded.

A worked example: a 30-business-day phase that starts on Monday, May 4, 2026, counted on the US federal calendar, ends on Tuesday, June 16, 2026, 43 calendar days later. Memorial Day falls inside the window, so the count runs 1 business day further than it would without it. Pick a different country and the same phase can end on a different day, because its holidays fall elsewhere. The United States calendar holds the federal holidays and no state holidays. A day that is not on the selected country's list, such as a state holiday or a company closure, can be typed under Advanced options; it is then skipped as well, saved in your browser and carried in a shared link.

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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 does adding business days help with project planning?
When a sprint, milestone or campaign is sized in working days, adding them to the start date gives the date it actually lands on, with weekends and holidays already stepped over. On a five-day week, ten business days from a Monday end on the Monday two weeks later when no holiday falls in between, and each weekday holiday in the window pushes the result one business day further. The result shows the end date and the number of weekend days skipped, and the Between Dates tab lists the holidays between the start date and that end date, so a plan can show why a date moved.
What is the difference between adding calendar days and business days?
Adding calendar days counts every day, weekends and holidays included; adding business days counts only the working days. On a five-day week, ten business days from a Monday take 14 calendar days when no holiday falls in the window, and more when one does: from Monday, November 2, 2026, ten business days on the US federal calendar end on Tuesday, November 17, 2026, 15 calendar days later, because Veterans Day falls in between.
How do I plan a milestone that has to land on a specific weekday?
Add the business days to find where the work ends, then move the milestone to the next occurrence of the weekday you want. Because the count skips weekends, a whole number of working weeks from a given weekday ends on the same weekday when no holiday intervenes: on a five-day week, twenty business days from a Monday end on the Monday four weeks later. A holiday inside the window moves the end one business day later, which can push a fixed-weekday milestone into the following week.
Can I add business days across a quarter or year boundary?
Yes. Quarter and year boundaries are not special: the count runs continuously and skips each holiday in the window. Sixty business days from Monday, October 19, 2026 on the US federal calendar end on Friday, January 15, 2027, 88 calendar days later, stepping over Veterans Day, Thanksgiving Day, Christmas Day and New Year's Day.
How is this different from the Business Days From Today calculator?
This page counts from a date you choose, such as a project kickoff or a contract's effective date. The Business Days From Today pages answer the same question from today's date and show a pre-computed answer for common counts. Both use the same business-day engine; the difference is where the count starts.

Sources for these rules

Checked October 12, 2026. All sources