What a business day means here
A business day is a Monday through Friday. Saturdays and Sundays are skipped. If you give the tool a list of holiday dates, those days are skipped too. The start day itself is not counted. If you count from Monday to Friday, you get 4 business days, because Monday is day zero and the count begins on Tuesday.
This tool does not assume a country or an employer. Holidays differ by country, region, and company. A bank in one state may close on a day that a factory in the same city stays open. So the calculator takes a list of dates you type in, one per line. If you leave the box empty, only weekends are removed.
Two ways to use it
Count business days between two dates
Enter a start date and an end date. The tool counts the weekdays in between. The start date is not included. The end date is included. If you need both ends counted, there is an inclusive option that adds one day to the total.
Example: you order a part on Monday, September 14, 2026. The seller says it ships in 5 business days. You want to know the ship date. Start with Monday, September 14. Skip the weekend of September 19 and 20. Five business days later is Monday, September 21, 2026. If September 18 is a company holiday and you list it, the ship date moves to Tuesday, September 22, 2026.
Add business days to a date
Enter a start date and a number of business days. The tool moves forward that many working days and gives you the new date. This is the mode you use for shipping estimates, contract deadlines, and payroll cutoffs. You can also move backward by entering a negative number.
Example: a contract says payment is due 10 business days after signing. You sign on Wednesday, September 16, 2026. Ten business days later is Wednesday, September 30, 2026. If you list a holiday inside that window, the due date pushes to the next working day.
Why the start day is not counted
Most business rules count from the day after an event. If a notice period is 3 business days and you give notice on Monday, the clock starts Tuesday. Counting the start day would give you a shorter period than the rule intends. The tool follows that convention by default. The inclusive option is there for the cases where a contract or policy says to count both ends.
This is also why the tool does not guess at holidays. A built-in list would be wrong for most users. A national holiday in one country is a normal workday in another. A company may close for a floating holiday that has no fixed date. By taking a list, the tool stays correct for your situation.
Common uses
- Shipping and delivery estimates: sellers often quote business days, not calendar days.
- Contract deadlines: notice periods, payment terms, and response windows are often written in business days.
- Payroll: pay periods and direct deposit cutoffs usually follow working days.
- Project planning: you can see how many working days are left before a launch date.
- School and work schedules: you can count teaching days or office days in a term.
If you need a plain day count that includes weekends, use the date calculator. For time math like 7.5 hours, use the time calculator. To see how the site handles dates and leap years, read how we calculate.
Dates, leap years, and daylight saving
Every day in these calculators is 24 hours. Daylight saving changes are not counted, so a day never has 23 or 25 hours here. Leap years follow the standard rule: every 4 years, except century years not divisible by 400. 2024 and 2028 are leap years. 2100 is not. That matters when a deadline crosses February 29.
Months are calendar months. January 31 plus one month is February 28, or February 29 in a leap year. January 31 to March 1 is 1 month and 1 day. These rules keep the business day count consistent with the calendar you see on the wall.
How to get a clean answer
- Pick the mode: count between dates, or add business days to a date.
- Enter your dates in the format the tool accepts.
- Type any holidays, one date per line. Leave the box empty if there are none.
- Choose inclusive only if your rule counts both the start and end day.
- Read the result. The tool shows the number of business days or the new date.
If the answer looks off by one, check whether the start day should be counted. That single choice causes most of the confusion with working day math.