Business Date Calculator

1. Enter the date the clock starts from.
2. Leave the direction on Add business days.
3. Enter how many working days to move.
4. Adjust the working week and add holidays if your office differs from Monday to Friday.
5. Press Calculate and read the resulting workday.

Switch the direction to Subtract business days. This answers backward-looking questions such as “if the filing is due on the 30th, and I need 10 working days of lead time, when must I start?” The same weekend and holiday rules apply in reverse.

Ten calendar days is always ten days later. Ten business days is usually fourteen calendar days, because two weekends fall inside the span. Add a public holiday and it becomes fifteen. Contracts and service windows normally mean business days, so check the wording before you plan around it.

By default it does not. The start date is day zero, so Friday plus one business day is the following Monday, and Monday minus one business day is the previous Friday. Some rules count the starting day itself, so the option is there when you need it. With it on, and a working start date, Friday plus one business day stays Friday.

Any day marked as a non-working weekday is skipped, and so is any date you list as a holiday. Skipped days do not count toward the total, but they do add to the calendar days elapsed. A holiday that falls on a weekend is counted once, as a weekend day.

Friday, January 2, 2026 plus 5 business days is Friday, January 9, 2026. Two weekend days are skipped, so 7 calendar days pass.