Business Days Calculator

Count how many working days (Mon–Fri) and weekend days fall inside any date range.

When a supplier says "15 business days", when a sprint ends, or when you are planning leave around a project, you need to know how many real working days a date range contains. Pick the start and end dates and this calculator counts them — including both endpoints, like most payroll systems.

How it counts

Working days are Monday through Friday; both the first and last date are included in the range. Saturdays and Sundays are counted separately. The tool does not subtract public holidays (they move every year), so subtract those manually when precision matters — in the US there are roughly 11 federal holidays per year.

Fast estimation rules

A year has about 250 working days (365 minus 104 weekend days minus ~11 holidays), and an average month has about 21. For a quick estimate: calendar days × 5/7 ≈ working days, then fine-tune with this calculator.

Frequently asked questions

How many calendar days is 30 business days?
Roughly 42 calendar days (six weeks) when no holidays interfere. Add a buffer if a public holiday falls inside the window.
Are the start and end dates included?
Yes. A Monday-to-Friday range counts as 5 working days, matching typical payroll counting.
Does it handle US federal holidays?
Not automatically — holiday dates shift every year. Count with this tool, then subtract the holidays (and add any furlough makeup days) yourself.

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