About this tool
Work out how many business days sit between two dates when planning delivery windows, project timing, or response SLAs.
Business Days Calculator is useful when the question is not just how many days exist between two dates, but how many working weekdays actually fit inside that window. It helps with delivery estimates, SLAs, project timing, and operational planning where weekends should not count.
- Counts business days in a bounded range with independent start and end inclusion rules.
- Adds or subtracts business days from a start date with an explicit start-count policy.
- Validates supplied holidays and exposes weekend overlaps, duplicates, and out-of-range dates.
How to use Business Days Calculator
Select the start and end dates, review the weekday count, and use the result in the schedule or estimate you are preparing. If the workflow also depends on regional holidays, treat this output as a baseline and adjust it with the holiday calendar used by your team or client.
When this tool is useful
- Counts business days in a bounded range with independent start and end inclusion rules.
- Adds or subtracts business days from a start date with an explicit start-count policy.
- Validates supplied holidays and exposes weekend overlaps, duplicates, and out-of-range dates.
Examples you can test
Load an example, compare the result with the expected output, then replace it with your own input.
Plan a five-day review window
Example input
Start date: 2026-06-10, business days: 5
Expected output
Due date excluding weekends
Useful for internal review deadlines where weekends should not count.
Count workdays between dates
Example input
Start: 2026-06-01, end: 2026-06-30
Expected output
Number of weekdays in the range
Use this for rough capacity planning, then adjust manually for holidays.
Validation checklist
- Confirm whether the start date should be included in the count.
- Adjust for public holidays or company closures if they matter.
- Check date ranges that cross weekends, months, or years.