How to count business days between two dates
A five-day review window, a delivery deadline, a staffing plan — business-day math is where weekends and holidays quietly eat the schedule. Pick the range, add your closure dates, and get the working-day count with the full breakdown.
Step by step
Open the business-days calculator
Start the free calculator — no account needed.
Enter the start and end dates
The start must be on or before the end; both endpoints are counted by default when they fall on weekdays.
Decide whether to include the endpoints
Turn off the include option to exclude both the start and end dates before weekend and holiday rules apply.
Add your holidays
Enter closure dates as YYYY-MM-DD; each unique weekday holiday inside the range subtracts one business day, and duplicates are deduplicated.
Read the full breakdown
See business days alongside calendar days, weekend days, and the number of holidays excluded.
Tips that save a second try
Weekends are fixed to Saturday and Sunday — no national or company calendar is loaded automatically, so enter your own observed closures.
A holiday that falls on a weekend is ignored rather than moved to an observed weekday; add the observed date yourself if your calendar moves it.
For a pure day count without weekend rules, the date-difference calculator is the simpler tool.
Common questions
Are the start and end dates counted?
They are counted by default when they are eligible business days. Turn off the include option to exclude both endpoints before weekend and holiday rules are applied.
What if I enter the same holiday twice?
Exact duplicate date strings are deduplicated, so a valid weekday holiday is subtracted at most once.