Home › Date & Time › Business Days Calculator
FREE · NO SIGN-UP · TRANSPARENT FORMULAS

Business Days Calculator

Count working days with a chosen weekend pattern and your entered holiday dates.

Your numbers

Make it your own
Updates as you type
Business days
5days

Calculated from your inputs · rounded for display

Excluded weekend days0
Excluded entered holidays0
End date includedYes

No national holiday calendar is loaded. Enter the holiday dates applicable to your location. Duplicate and out-of-range holidays do not change the count.

Your calculation, step by step

No black boxes
  1. Count from 2026-10-19 through 2026-10-23.
  2. Exclude the selected weekend pattern.
  3. Exclude only entered holiday dates that are not already weekends.
  4. Remaining working days = 5.

How to use this calculator

  1. Enter your own values in the labeled fields. Check the units and assumptions before comparing results. Only the fields needed for your selected calculation mode are shown.
  2. Your answer updates automatically. Review the calculation steps to see exactly how it was calculated.
  3. Copy, share, save, or download your result. Saved inputs stay on this device.

How the calculation works

Business days = counted calendar dates − weekend dates − non-weekend holiday dates

The start date is considered, while the end date follows your inclusion setting. Weekends are excluded using the selected pattern. Enter actual applicable holidays; no national calendar is supplied. Duplicate holidays and holidays outside the interval are ignored, and a holiday on a weekend is not deducted twice.

A worked example

Monday October 19 through Friday October 23, 2026 inclusive contains 5 weekdays. Excluding an entered Wednesday holiday leaves 4.

Reading your result

Use the main result together with its units and supporting figures. Display values are rounded; calculations keep their underlying precision. A change in inputs or assumptions can change the answer. Compare the step-by-step working with your intended use before relying on an estimate.

Frequently asked questions

Does it know public holidays automatically?

No. Enter the relevant holiday dates yourself.

Can I use a different weekend?

Yes. Select the weekend pattern or choose no weekend exclusions.

Sources & methodology

This calculator uses the mathematical identity and assumptions stated above. No current rates, prices, or external data are loaded. Conversion tools use international unit definitions.

Formula review: October 24, 2026. Read our methodology.