Business Days Calculator
Calculate business days between two dates (excluding weekends), or add a number of business days to a start date.
Enter a start and end date, then click Calculate to see the business days breakdown.
Disclaimer: The results provided by this tool are estimates for informational purposes only. Actual values may vary. Please verify important calculations independently.
How business days are counted
The calculator iterates through each calendar date between your start and end points, advancing one day at a time and checking two conditions for each candidate: is it Monday through Friday, and if a country is selected, is the date absent from that country's public holiday list. Only days that pass both filters count toward the total. Saturdays and Sundays are always skipped, and the start date is excluded from the count so that Monday to Friday yields four business days โ Tuesday, Wednesday, Thursday, and Friday โ rather than five. This endpoint convention matches how most contracts and SLAs are written.
Public holiday data covers eight countries with different rules: United States federal holidays, Canadian statutory days, UK bank holidays, Australian national holidays, Chinese mainland public holidays, Japanese national holidays, South Korean public holidays, and Indian national holidays. When a holiday falls on a weekend, some countries observe the following Monday as a substitute; the calculator reflects each country's actual observance rather than applying a generic rule. In Add mode, the logic runs in reverse: the tool advances from the start date one business day at a time until it has counted the requested number, then returns the landing date.
Where business day counts matter
Payment terms, shipping estimates, regulatory filing windows, and employment notice periods almost always refer to business days rather than calendar days. 'Net 30 business days' is meaningfully different from 'net 30 days' โ across a month containing a long weekend and a national holiday, the business-day window can extend four or five calendar days past the simple 30-day mark. Procurement teams, HR departments, and legal operations rely on these counts to set deadlines that align with when counterparties are actually working. Shipping calculators use the same logic to predict delivery dates for ground service across regions.
Edge cases arise near year boundaries and during holiday clusters. Counting business days from December 20 to January 5 in the US, for example, skips both weekends and two federal holidays (Christmas Day and New Year's Day), producing substantially fewer business days than a naive weekday count would suggest. International projects complicate things further: a deadline that is business-day-reasonable in New York may fall on Golden Week in Japan or Chunjie in China, when counterparties are unreachable for a full week. Selecting the correct country in the holiday filter aligns the count with the calendar the counterparty actually observes.