Business Days Calculator
Pick two dates. Weekends and public holidays are subtracted for you.
More options
Custom holidays
Add a company or local holiday that isn't in the preset. Weekends and duplicates are ignored.
Public holidays only — company days off, regional holidays and paid leave aren't included. Everything is worked out in your browser.
Counting the days that actually count
Deadlines, SLAs, payroll cut-offs, notice periods, and delivery estimates are almost never measured in calendar days — they are measured in business days, the days an office is actually open. Counting those by hand means crossing off weekends and every public holiday in between, which is error-prone and country-specific. This calculator does it for you: it counts business days between two dates, or adds and subtracts a number of business days to find a due date, with weekends and the right national holidays removed automatically.
How to use it
- Days between dates: pick a start and end date to get the number of business days in that span.
- Add or subtract days: enter a start date and a number of business days, then choose After (a due date) or Before (work backwards to a start date).
- Your country's public holidays are preselected from your browser region; the breakdown always splits the total into business, weekend, and holiday days so you can verify it.
What counts, and what is excluded
A business day is any day that is not a weekend and not a public holiday. The weekend defaults to Saturday–Sunday, but visitors in Friday–Saturday regions (Saudi Arabia, Egypt, Bangladesh, Israel and others) get that weekend automatically, and you can override it under More options. Thirteen national holiday calendars are built in — the US, UK (England & Wales), Canada, Australia, Germany, France, Spain, Brazil, Mexico, India, Russia, Japan and South Korea — including substitute ("observed") days. Company or regional days off are never assumed; add them under Custom holidays.
Worked examples
Business, working, and calendar days compared
| Term | Counts weekends? | Counts holidays? | Used for |
|---|---|---|---|
| Calendar days | Yes | Yes | Age, countdowns, interest periods |
| Business days | No | No | SLAs, shipping, payment terms |
| Working days | No | No | Same as business days (a synonym) |
Common mistakes
- Forgetting the endpoints rule. Whether the start and end dates are included changes the total by a day or two — check the Include start / Include end toggles against how your contract defines the period.
- Assuming everyone shares your weekend. A deadline agreed with a Gulf partner may run on a Friday–Saturday weekend; set it explicitly rather than assuming Sat–Sun.
- Missing local or company holidays. The presets cover national public holidays only — a regional holiday or a company shutdown must be added as a custom holiday, or the count runs long.
Scope and accuracy
The built-in calendars cover national public holidays; they do not include regional (state or province) holidays, company days off, or paid personal leave. Korean lunar holidays such as Seollal and Chuseok are fixed by decree each year, so Korea is covered for 2025–2027, while every other country is computed from its underlying rules and works for any year. Everything is calculated in your browser, and your dates never leave your device.
Sources & further reading
Frequently asked questions
What's the difference between business days, working days and calendar days?
Calendar days count every day, including weekends and holidays. Business days (also called working days) count only the days most offices are open, so this business days calculator subtracts weekends and public holidays from the total to show the number of actual working days between your two dates. Use calendar days for age or countdowns, and business days for deadlines, SLAs, payroll and delivery estimates.
Which public holidays does the working days calculator exclude?
Your country is preselected from your browser region and its official days off are removed automatically — you never have to look a holiday up. Thirteen calendars are built in: the United States, United Kingdom (England & Wales), Canada, Australia, Germany, France, Spain, Brazil, Mexico, India, Russia, Japan and South Korea, including substitute days such as US observed holidays, UK bank holiday substitutes and Japan's furikae kyūjitsu. Korean lunar holidays (Seollal, Chuseok) are fixed by decree each year, so Korea covers 2025–2027; every other country is calculated from the law and works for any year. For a company or regional day off, add it under More options → Custom holidays.
Are the start and end dates counted?
By default both the start and end date are included, which is what most contracts and SLAs mean by "within N business days". Open More options and turn off "Include start date" or "Include end date" if your rule counts from the day after or stops the day before. The breakdown always splits the total into business, weekend and public-holiday days so you can check the math.
Can I change the weekend from Saturday–Sunday?
The weekend is set for you: visitors in Saudi Arabia, Egypt, Bangladesh, Israel and other Friday–Saturday regions get that weekend automatically, everyone else gets Saturday–Sunday. You can override it any time under More options → Weekend days, and the setting applies both to counting days between dates and to adding or subtracting business days.
How do I add business days to a date to find a due date?
Switch to the "Add or subtract days" tab, pick a start date, enter a number of business days and choose After to get a due date or Before to work back to a start date. Weekends and the selected holidays are skipped automatically, which is handy for shipping ETAs, payment terms and SLA deadlines. Everything runs in your browser, so your dates never leave your device.