Business Days
Count business days (Mon-Fri) between two dates
About this calculator
The Business Days Calculator counts working days (Monday–Friday) between two dates, inclusive of both endpoints. It reports the total calendar-day span, the number of business days, weekend days, and full weeks, using strict weekend-only exclusion without holiday calendars. Dates are validated as YYYY-MM-DD, and impossible dates or a start after the end return a clear error. Useful for project deadlines, shipping estimates, and leave planning.
How to use the Business Days calculator
- Enter your values into the input fields.
- Read the result — it updates instantly as you type.
- Adjust the inputs to compare scenarios.
- Copy the page URL to share the exact calculation.
Common examples
- Jan 1 → Jan 31, 2025: 31 total days, 23 business days, 8 weekend days
- Mon Jun 2 → Fri Jun 6, 2025: 5 total days, all 5 are business days
- Full year 2025 (Jan 1 → Dec 31): 365 days → 261 business days, 104 weekend days, 52 weeks
- Mar 10 → Apr 10, 2025: 32 total days → 24 business days, 8 weekend days
Frequently asked questions
How does the Business Days calculator work?
Enter your numbers and the calculator applies the standard formula for this everyday task, showing the result and how it was reached. It handles the unit and rounding details so you do not have to.
When would I use the Business Days calculator?
Whenever this comes up in daily life — planning, shopping, home projects, travel or work — and you want a quick, dependable answer instead of estimating or working it out by hand.
How accurate are the results?
The math runs at full precision internally and only the displayed value is rounded for readability. For real-world use the practical limit is the accuracy of the numbers you enter, not the calculation.
Can I share a specific calculation with someone else?
Yes. Every value you enter updates the URL, so copying the address bar and sharing the link reopens the exact same calculation for whoever clicks it.