Business Days Calculator
Count business days (weekdays) between two dates, with an optional holiday deduction.
How this calculator works
- Enter a start date and an end date.
- The calculator counts every weekday (Monday–Friday) in that range, using UTC-based date math to avoid daylight-saving errors.
- Subtract the number of holidays that fall in the range, if any, for the final business-day count.
This calculator counts the number of business days — Monday through Friday — between two dates, which is useful for estimating delivery windows, project deadlines, or how many working days are left before a due date. Subtract known holidays for a more precise count.
Example
From Monday, March 2 to Friday, March 13 (10 calendar weekdays across two full work weeks) is 10 business days. If one holiday (like a Monday off) falls in that range, subtract 1 for 9 business days.
Limitations
This counts calendar weekdays only — it doesn't know regional or company-specific holidays automatically, so enter the count of holidays that fall within your date range manually.
Frequently asked questions
How are business days calculated?
We count every Monday through Friday between your start and end dates, inclusive, then subtract any holidays you specify.
Does this include the start and end date?
Yes, both dates are included in the count if they fall on a weekday.
Can I exclude specific holidays automatically?
Not automatically — holidays vary by country, region and company. Enter the number of holidays that fall within your date range in the holidays field to subtract them.
Why use UTC-based date math?
Calculating date differences in local time can produce off-by-one errors around daylight saving time changes. Using UTC midnights avoids that entirely.