Business days calculator
Working days between two dates.
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How it's calculated
Count the days from a fixed Monday to each date. The number of weekdays from that Monday up to any day is five for every full week plus however many of the leftover days fall before Saturday, which is the smaller of the remainder and five. The weekdays between your two dates is that count at the end date less the count at the start date. Calendar days less weekdays is the weekend days, and the holidays you enter come off the weekday total.
How many business days are in a month?
Twenty to twenty-three, depending on where the weekends fall: 260–262 weekdays in a year, so about 21.7 a month, before public holidays. A 30-day span starting on a Tuesday has 22 weekdays.
Should I count the start day, the end day, or both?
The tool always counts the start day and leaves the end day out, which fits "due in 10 business days": the deadline is the tenth weekday after you start. Switch the end-date option on when the last day is a working day, as in "the office is open from the 20th through the 24th".
Does it know about public holidays?
No, because they differ by country, state and employer. Count the weekday holidays in your span and enter the number; US federal holidays are about 11 a year, two or three in a typical month between November and January and none in most summer months.
Results are estimates for informational purposes only and are not financial, medical or legal advice.