Business Days Calculator

Count the number of business days between two dates while automatically excluding weekends. You can also add holiday dates to remove them from the final count, which is useful for project planning, delivery estimates, SLA deadlines, payroll windows, and office scheduling.

How to use the Business Days Calculator

Enter the start date and end date.
Add optional holiday dates in YYYY-MM-DD format, one per line.
Click Calculate to count the business days.
Use Copy if you want to paste the result into a message, spreadsheet, or report.

Common use cases

Estimating project lead times excluding weekends.
Calculating SLA or support response windows.
Planning delivery, shipping, or fulfillment schedules.
Counting payroll, invoice, or billing periods.
Checking how many working days remain before a deadline.

Tips & notes

The start and end dates are included when they fall on weekdays.
Holiday dates only reduce the count when they fall inside the selected range and on a weekday.
Use one holiday date per line for best results.
This calculator uses a Monday–Friday work week.

Related time tools

FAQ

What is a business day?

This calculator treats Monday to Friday as business days and excludes Saturdays and Sundays.

Can I exclude public holidays?

Yes. Add holiday dates in YYYY-MM-DD format, one per line, and they will be excluded if they fall on a weekday.

Are the start and end dates included?

Yes. The calculator counts both the start date and end date when they are valid business days.

What happens if the end date is before the start date?

The calculator will show a clear error so you can correct the date range.

Can I change the weekend days?

Not in this version. It uses a standard Monday–Friday work week.