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Business days between dates

Count the calendar days and business days between two dates, find out when a business-day deadline falls and see the holidays in the period. Add the holidays that apply where you are.

Educational simulation. Not investment advice. Results are estimates based on the data you enter and do not replace advice from a qualified professional.

Reviewed on Nov 1, 2026

Example: a deadline from November 3 to December 31, 2026.

Period
Add to the start date

Use a negative number to go back in time (subtract days).

Holidays

Your inputs stay only on this browser and are not sent anywhere. Untick to delete them.

—Business days in the period
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Days in each month of the period

Business days, weekends and weekday holidays, month by month.

Tap the chart to see the values.

Holidays in the period

From your list; a holiday on a weekend does not change the business-day count.

Next step

Take this page’s results to another calculator with the fields already filled in.

Work out late interest and penalty for this period →

The summary lists your inputs, results, formulas, assumptions and sources. The full report also includes the charts and interpretations, in color. In the print dialog, choose Save as PDF.

Method, assumptions and sources

Formulas

Calendar days = end date − start date (+ 1 if the start date counts)
Business days = days in the period that are not Saturday, Sunday or a listed holiday
Date + N business days: step forward one day at a time from the start date, counting only business days until N

Assumptions and limits

  • Monday-to-Friday workweek; holidays as listed by you. Dates are handled in UTC, unaffected by daylight saving time.
  • Legal, court, tax and banking deadlines may have their own rules (rolling to the next business day, court calendars and so on); check the rule that applies.

Official sources and references

Frequently asked questions

What is the difference between calendar days and business days?

Calendar days count every day, including weekends and holidays. Business days count only Monday to Friday, minus holidays. A 30-calendar-day period has about 21 or 22 business days.

How do I read the example result?

From November 3 to December 31, 2026 there are 58 calendar days, not counting the start date. Of those, 16 fall on weekends, leaving 42 business days because the holiday list starts empty. Adding 10 business days to November 3 gives November 17.

Does the start date count?

For most deadlines, no: counting starts the next day, which is the calculator’s default. If your case counts both ends, such as nights of a stay or daily rentals, tick the option to also count the start date.

Why is the holiday list empty?

Public holidays differ by country, state and city, and some move each year. Add the ones that apply to you, one per line as date; name. In the U.S., for example, Thanksgiving (November 26, 2026) and Christmas (December 25) would remove two business days from the example period.

How do I add or subtract business days?

Enter the number in "business days to add"; the calculator steps forward from the start date, skipping Saturdays, Sundays and listed holidays. Use a negative number to go back, for example to find the last day to ship something 5 business days before an event.

Is Saturday a business day?

Not in this calculator. Some industries treat Saturday as a working day, but banks and most financial deadlines do not. Check the rule that applies to you.

Can I use it for late payment interest?

Yes: the calendar days between the due date and the payment date are the basis for daily late interest. Use the next-step button to take the dates to the late interest calculator.

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How to count calendar days and business days

Payment terms, deliveries, contracts and notices can be counted in calendar days (every day) or business days (Monday to Friday, minus holidays). The gap is large: from November 3 to December 31, 2026 there are 58 calendar days but only 42 business days, before any holidays.

How counting works

For most deadlines the start date does not count: from the 1st to the 10th is 9 days. The calculator follows that rule and lets you also count the start date. Business days exclude Saturdays, Sundays and the holidays on your list.

Adding business days

To find when a 10-business-day deadline starting November 3, 2026 ends, the calculator steps forward one day at a time, skipping weekends and holidays: with no holidays listed, the deadline is November 17. Use a negative number to count backward.

Holidays

Holidays differ by country, state and city, so the list starts empty. Add the public holidays that apply to you, one per line; when a holiday falling on a weekend is observed on a Friday or Monday, enter the observed date. Court, tax and banking deadlines may have their own counting rules: check the one that applies.