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Date, Time & Age

Business Days Calculator with Holidays

Count business days between dates excluding weekends and your own list of holidays, or add business days to find a deadline.

Your inputs

Enter the official holidays for your country or organisation — none are assumed.

Results

Business days (inclusive)

20

Holidays falling on working days
2
Weekend days
9

✓Exact calculation — rounded only for display

What this calculator does

Deadlines are often set in business days. Enter the holidays that apply to you — no country’s holidays are assumed.

Formula and method

Business days = days in range that are neither weekend days nor listed holidays. Adding N business days steps forward skipping both.

Worked example

Calculated by this tool with its default inputs:

Inputs

  • Calculate: Business days between two dates
  • Start date: 2026-01-01
  • End date: 2026-01-31
  • Weekend days: Saturday & Sunday
  • Holidays to exclude (YYYY-MM-DD, one per line or comma-separated): 2026-01-01 2026-01-19

Results

  • Business days (inclusive): 20
  • Holidays falling on working days: 2
  • Weekend days: 9

How to read the results

Holidays that fall on weekend days are counted as weekend days, not twice.

Assumptions and limitations

  • Date-only arithmetic on the Gregorian calendar; results do not depend on your time zone or daylight-saving changes.
  • Observed (substitute) holidays must be entered explicitly.

Questions

Is the start date counted?

When adding business days, day 0 is the start date and counting begins the next day.

Methodology and verification

Result type
Exact mathematical calculation (rounded only for display)
Formula version
1.0
Automated verification
5 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
Editorial review
Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.

Privacy

Everything you enter is calculated in this browser and is not sent to Numerith or anyone else. Inputs are added to a share link only if you choose to include them. Privacy policy