Business Days Calculator

When a contract says payment is due in 10 business days, or a return window closes 30 business days after delivery, counting on your fingers past two weekends gets old fast. This business days calculator counts the working days between two dates, or adds a number of business days to a start date and tells you exactly where you land.

Saturdays and Sundays are skipped automatically. Holidays are yours to add, and I will explain below why the tool flatly refuses to guess them for you. Everything runs in your browser and nothing you enter is uploaded.

How to use

1. Choose a mode: count business days between two dates, or add N business days to a start date.
2. Pick your start date.
3. Pick an end date, or type the number of business days to add.
4. Optionally paste or add the holiday dates you want excluded.
5. Read the results: business days, total calendar days, and the landing date.
6. Adjust the holiday list any time and watch the counts update instantly.

Why use our business days calculator?

The part I got wrong first was holidays. My first version shipped with a hardcoded US federal holiday list, and within a week I understood how wrong that was. Holidays differ by country, by state, by province, by year, and sometimes by employer. Good Friday closes offices across Australia and Canada but is not a US federal holiday at all. So I removed the guessing entirely: you add the holidays that apply to you, and the answer is exact for your situation instead of approximately right for one country.

For US users, the official federal holidays list from OPM is the authoritative starting point, and UK users can pull bank holidays straight from GOV.UK. Adding ten dates takes under a minute, and the tool remembers none of them afterward, because nothing ever leaves your browser.

Seeing both numbers side by side matters. Ten business days is fourteen calendar days when it spans two weekends, and fifteen or sixteen with holidays in the middle. Getting business days, calendar days and the landing date together stops the classic mistake of promising a client something in two weeks when the contract clock actually runs three.

The add mode answers questions the way deadlines are actually phrased. Nobody writes the response is due March 24. They write within 15 business days of receipt. Enter the receipt date, enter 15, and you get a real calendar date you can put in your diary and stop thinking about.

If you want raw calendar math instead, the date difference calculator counts total days, weeks and months without skipping anything, and the time zone converter helps when your deadline technically expires in somebody else's time zone.

Who is this tool for?

Payment terms are the big one. Net 30 usually means calendar days, but plenty of contracts specify business days for disputes, refunds and delivery windows. If you bill clients, pairing this with my invoice generator means the due date you print is one you calculated rather than eyeballed.

Legal and HR deadlines are almost always written in business days: responses to demand letters, appeal windows, background check timelines, notice periods. When a letter says you have 10 business days to respond, this tells you the exact last day, and whether the Thanksgiving week sitting in the middle just quietly cost you two of them.

Shipping and returns run on business days too. A retailer promising delivery in 5 to 7 business days on a Thursday order before a Monday holiday is really promising the better part of two weeks, and it helps to know that before you pick a shipping speed.

For project planning, adding 20 business days to a kickoff date gives you an honest four-week estimate that will not silently swallow weekends the way a naive calendar count always does.

Frequently asked questions