Business Days Calculator
Count the working days between two dates, or add and subtract business days from a start date. Choose which days are your weekend, enter your own holiday dates, and toggle whether the start and end dates count. Everything runs locally in your browser.
- 100% free
- Private & safe
- Runs in your browser
Why use Business Days Calculator?
Business Days Calculator works out the answer precisely from local calendar dates, so there are no timezone or daylight-saving surprises.
- Runs instantly in your browser — nothing to install, nothing uploaded.
- Completely free, with no account, no watermarks and no usage limits.
- Handles Business days = weekdays in range − holidays entered; Weekends (Sat/Sun) are excluded.
- Pick a mode: count business days between two dates, or add/subtract business days from a date.
- Works on any device — desktop, tablet and phone — and is fully keyboard accessible.
What it can do — and its limits
- Two modes: count business days between dates, and add or subtract business days from a start date.
- Custom weekend selection (any combination of the seven days).
- Specific holiday dates rather than just a count, so weekend holidays are never subtracted twice.
- Include or exclude the start and end dates, with a business/weekend/holiday/total breakdown.
- Copy the result together with the assumptions used to produce it.
How to use Business Days Calculator
- Pick a mode: count business days between two dates, or add/subtract business days from a date.
- Choose which days are weekends (defaults to Saturday and Sunday).
- Enter any specific holiday dates (YYYY-MM-DD) to exclude — holidays on a weekend are not double-counted.
- Toggle whether the start and end dates are included, then read the breakdown and copy the result with its assumptions.
Examples
- Estimating a delivery window in working days.
- Counting workdays in a billing period.
Worked example
Input
Start on a Monday, end on the Friday of the following week (two work weeks).
Output
10 business days — the two weekends in between are excluded.
Supported formats & limits
- Business days = weekdays in range − holidays entered
- Weekends (Sat/Sun) are excluded
Limitations
- The calculator does not automatically load national or regional holiday calendars. Enter the specific holiday dates that apply to your location, employer or contract.
- Business-day definitions vary. Choose the correct weekend pattern and start/end inclusion rules before relying on the result.
- Confirm the governing rules separately for legal, financial or compliance deadlines.
Common problems & fixes
Public holidays are still counted.
Add them to the holiday list so they're subtracted.
Off by one day.
Check whether you want the start date counted — inclusive vs exclusive ranges differ by one.
Frequently asked questions
Does it know public holidays?
The calculator does not automatically select holidays for a country or region. Enter the specific holiday dates that apply to your schedule. Holidays that fall on selected weekend days are not counted twice.
Are weekends excluded?
Yes. Saturday and Sunday are selected by default, but you can choose any combination of weekend days to match your organization or location.
Is the date range inclusive?
You control this setting. Use the switches to include or exclude the start date and end date. The result displays the assumptions used.