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Add Business Days Calculator

Pick a start date and the number of business days to add.

How it is calculated

The tool takes a start date (YYYY-MM-DD) and a whole number n of business days. From the start date it moves forward one calendar day at a time and raises a counter only when the new day is Monday to Friday; Saturdays and Sundays are stepped over without counting. When the counter reaches n, that day is the answer, shown with its abbreviated weekday, together with the number of calendar days elapsed. The start day itself is never counted. A fractional n is rounded to the nearest whole day, and a negative number, a number above 100,000, an empty field or an impossible date such as 2026-02-30 gives no result. With n = 0 the start date comes back unchanged, even on a weekend. Only weekends are skipped: public holidays differ by country and year and are not.

Worked example

Start on Thursday 2026-10-15 and add 10 business days. Fri 16 is day 1; Sat 17 and Sun 18 are skipped; Mon 19 to Fri 23 are days 2 to 6; Sat 24 and Sun 25 are skipped; Mon 26 to Thu 29 are days 7 to 10. The calendar span is 29 - 15 = 14 days, so the tool shows 2026-10-29 (Thu) with 14 days elapsed and 10 business days added.

Try this example →

Common mistakes

  • Counting the start day as day 1. Counting begins the next day, so 1 business day after a Friday is Monday, not that Friday.
  • Expecting public holidays to be skipped. Only Saturdays and Sundays are, so a deadline that excludes holidays needs extra days added by hand.
  • Confusing business days with calendar days. 10 business days is normally 14 calendar days, not 10.
  • Starting on a weekend and treating it as a working day. Adding 1 business day to a Saturday gives Monday, exactly as for a Sunday.
  • Typing 2.6 and expecting a partial day. The value is rounded to 3 whole business days.

About this calculator

Adding business days to a date is different from simple date arithmetic because it must skip non-working days — the calculator steps forward one calendar day at a time from the start date, counting only Monday through Friday and skipping every Saturday and Sunday, until it has counted off the requested number of business days, landing on the resulting working date.

This is the standard way contracts, invoices, shipping estimates and legal notices phrase deadlines — “within 5 business days” or “net 30 business days” — because it gives a predictable timeframe that isn’t distorted by which day of the week the countdown happens to start on. Project managers, payroll administrators and anyone tracking a shipping or legal deadline use it to find the exact working date a commitment falls on; note that this counts only weekends, not public holidays, unless your specific deadline explicitly excludes those too.

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Comments (1)

  • Editorial team

    The tool skips Saturdays and Sundays only, not public holidays. Starting on 2026-11-04 and adding 10 business days lands on 2026-11-18 (Wed), 14 calendar days later, but a bank holiday in that stretch would push a real deadline one day further. For contracts or delivery promises, add the holidays of your country by hand. Which holiday calendar would matter most for the dates you work out?

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