Calculator Soup Date Calculator vs BusinessDayCalculator.org
Last reviewed: May 19, 2026
Calculator Soup's Date Calculator is a quick, no-frills way to add or subtract days from a date. Tick the business-days option and it counts weekdays only; there is even a checkbox to count Saturday as a business day for a six-day week. It is free, needs no sign-up, and loads fast. For plain date arithmetic, it does the job well, and that is worth saying up front.
The gap shows up the moment public holidays enter the picture. Calculator Soup states plainly that holidays are not included in its calculation and that you have to extend the final date yourself by however many holidays fall in the span. It also has no country-specific holiday lists and no way to set an unusual weekend. Those are exactly the gaps this site fills.
The holiday difference, concretely
Say you add 10 business days to a US date that spans a federal holiday. Calculator Soup returns a weekday-only result, then expects you to know the holiday is there and push the date out by one more working day. Miss it and the deadline is wrong by a day. Here, the holiday is removed automatically once you pick the country, so the answer is right without a second mental step. That single difference is why a holiday-aware calculator matters for invoices, filings, and SLAs, where a one-day error has consequences.
Feature comparison
| Feature | Calculator Soup | BusinessDayCalculator.org |
|---|---|---|
| Cost / account | Free, no sign-up | Free, no account or sign-up |
| Add or subtract days | Yes, with a business-days-only option | Yes, business days built in |
| Saturday as a business day | Yes, optional checkbox (six-day week) | Handled by the country's working week |
| Automatic public holidays | No, you extend the date by hand | Yes, built in for 25 countries |
| Country-specific holiday lists | None; links out to US reference sources | 25 countries plus sub-national regions |
| Custom weekend (Fri-Sat, Sun-Thu) | No, only the Saturday toggle | Yes, set automatically per country |
| Payment-term tools (Net 30/60/90, invoice) | Not offered | Dedicated calculators |
| Embed on your own site | Not offered | Yes, free iframe widgets |
Try a holiday-aware count
Count working days with public holidays removed using the business days between dates calculator, or add a deadline with add business days. For billing, the invoice due date calculator applies the holiday rules for you. Put any of them on your own site with a free embed widget, and see more side-by-sides on the alternatives hub.