Business Days Calculator
WEBCalculate the number of business days between two dates, with calendar days and weekend days shown alongside the total.
Counts Monday through Friday, inclusive of both the start and end date. Public holidays are not excluded.
What is the Business Days Calculator tool?
This business days calculator counts the working days — Monday through Friday — between a start date and an end date, including both ends when they land on a weekday. Instead of counting boxes on a calendar by hand, you pick the two dates and get an instant, accurate total, along with the total calendar days and how many of those were weekend days you can ignore.
It is built for the everyday planning questions that plain calendar math gets wrong: how many working days until a deadline, how long a project sprint actually runs once weekends are stripped out, how many billable days sit inside a date range, or how many working days of notice, leave or shipping time you actually have. Because weekends do not count toward most contracts, SLAs and delivery estimates, a raw day-count between two dates is almost always the wrong number — this tool gives you the one that matters.
If you accidentally set the start date after the end date, the tool handles it gracefully instead of showing a negative or broken result, so you can move fast without worrying about the order you picked the dates in. Everything runs in your browser — no sign-up, no account, and it keeps working once the page has loaded, even offline.
How to use the Business Days Calculator
- Pick your start date using the date field.
- Pick your end date the same way.
- Read the business-days count in the result card at the top.
- Check the breakdown below for calendar days and weekend days excluded.
- Use the swap button if you need to flip the two dates around.
Frequently asked questions
What counts as a business day?
Any Monday through Friday. Saturdays and Sundays are treated as weekend days and are not counted, even if they fall between your start and end dates.
Are the start and end dates both included in the count?
Yes. If both the start and end date fall on a weekday, they are each counted as one business day, matching how most deadlines and contracts are read inclusively.
Does this exclude public holidays?
No — it only excludes Saturdays and Sundays. Public holidays vary by country, region and organization, so they are not built in; subtract any known holidays from the result yourself if you need an exact figure for your calendar.
What happens if I pick a start date after the end date?
The tool swaps the two dates automatically and shows a small notice, so you always get a correct, non-negative count instead of an error.
Is this business days calculator free to use?
Yes — completely free, with no sign-up and no limits. It also works offline once the page has loaded, since all the date math happens on your device.