Add Business Days Calculator
Add a number of business days to a start date to find when a working-day deadline lands. The calculator steps forward through Monday-to-Friday dates, skipping weekends entirely. Enter a negative number to count backward instead. The result shows the resulting date, the day of the week it falls on, and the total calendar days the span covers.
How adding business days works
remaining = business days to add
step one calendar day at a time (forward or back)
if the new day is Mon to Fri: remaining -= 1
stop when remaining reaches 0
Counting starts the day after (or before) the start date, so a weekend start date does not consume a business day. Weekends are always skipped.
Worked example
Adding 5 business days to a Monday lands on the following Monday: Tuesday, Wednesday, Thursday, Friday make four, then the weekend is skipped and the next Monday is the fifth business day. That is 7 calendar days spanned.
Adding business days: frequently asked questions
How does adding business days work?
Starting from the day after the start date, the calculator steps forward one calendar day at a time, counting only Monday through Friday, until it has counted the requested number of business days. Weekends are skipped and never counted.
Can I subtract business days?
Yes. Enter a negative number of business days and the calculator steps backward through weekdays to find an earlier working-day date.
Does this include public holidays?
Public holidays are not subtracted automatically because they vary by country, state, and employer. The calculator skips weekends only. If a public holiday falls within your span, add an extra business day to compensate.
What if the start date is a weekend?
Counting always begins on the next weekday. The first business day added lands on the following Monday-to-Friday date, so a weekend start date does not consume a business day.
Official sources
- U.S. Office of Personnel Management: Federal Holidays.
- Day counting follows the standard Gregorian calendar.
Reviewed by the CalculatorHub team, edited by James Graham, 19 June 2026. See our methodology.