What this calculator does

Business day counts are useful for delivery windows, service levels, project planning and payment terms. This calculator counts weekdays and lets you enter holiday dates to exclude.

Formula used

The calculator walks through each date in the range, counts Monday to Friday and subtracts matching holiday dates entered in the holiday field.

How to read the result

Different countries and businesses define working days differently. Add local public holidays or company closure dates when they matter.

Assumptions

  • Counts Monday to Friday as business days.
  • Excludes holiday dates entered as comma-separated YYYY-MM-DD values.
  • Does not automatically fetch public holiday calendars.

Sources and checks

This calculator uses a standard public formula. Where rules or thresholds can change, source links are listed on the relevant page.

Frequently asked questions

Can I use this outside the UK?

Yes. Enter the local public holidays you want to exclude, and the calculator will count weekdays in the same way.