Business Days Calculator
Count working days (Mon to Fri) between two dates. e.g. “How many working days until a deadline?”
Enter your values
Results update as you type. All calculation happens in your browser.
Methodology
Count working days (Mon to Fri) between two dates. This tool uses a standard, documented formula and runs entirely on your device.
Last reviewed January 2026 · Runs client-side
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Counting working days to a deadline
Deadlines written in business days ignore weekends, so counting them on a calendar by hand is easy to get wrong. This calculator counts only Monday to Friday between two dates, giving the working-day total directly.
It also shows the calendar-day and weekend-day totals, so you can see exactly how much a weekend or two shifts a deadline.
How to use this calculator
- Pick a start date.
- Pick an end date.
- Read the business days, alongside the calendar and weekend totals.
What the inputs mean
- Start and end dates
- The range is counted inclusively. Public holidays are not removed, so check your local calendar.
From 1 January to 1 February 2026 there are about 23 business days out of 32 calendar days, with the rest falling on weekends.
The formula, in plain terms
Every day in the range is checked, and those falling on a Saturday or Sunday are excluded from the count.
Frequently asked questions
Does it account for holidays?
No. It excludes weekends only, so subtract any public holidays that fall inside your range.
Is the range inclusive?
Yes, both the start and end dates are counted if they are weekdays.
Last reviewed January 2026. This explainer is general information, not professional advice.