Count the working days between two dates — weekends excluded, and you can subtract your holidays too.
What Is a Business Days Calculator?
A business day is any weekday — Monday to Friday — so a business-days calculator counts only those between two dates, skipping Saturdays and Sundays. Contracts, delivery SLAs, payment terms (“payment within 10 business days”) and project schedules all run on business days, and counting them by hand across month ends is exactly where errors creep in. This tool counts inclusively from start to end, reports the weekend days separately, and lets you subtract holidays you enter.
How to Use the Business Days Calculator
- Pick the start and end dates (order does not matter).
- Enter how many public holidays fall on weekdays inside the range.
- Click “Count Business Days”.
- Use the net figure for deadlines and schedules.
Formula
Walk each day from start to end (inclusive): Saturday and Sunday are weekend days; the rest are business days. Business days minus holidays = business days − holiday count (never below zero).
Worked Example
October 2026 (Oct 1 to Oct 31): 31 total days, 9 weekend days, 22 business days. With 1 holiday: 21 net business days.
How It Works, In Plain Words
The tool walks the calendar one day at a time, exactly as the Formula section describes. It starts on your start date — swapping the two dates first if you entered them in reverse — and steps forward day by day until it reaches the end date, counting both endpoints because the count is inclusive. Each day is tested against the weekend rule: a Saturday or a Sunday goes into the weekend tally, and every other day goes into the business-day tally. Three counters therefore grow together — total days, weekend days and business days — and they always add up, which is why the worked example’s 31 total days split cleanly into 9 weekend days and 22 business days. Only at the very end does the holiday figure come in: the count you entered is subtracted from the business days, with a floor of zero so the net figure can never go negative. A blank or negative holiday entry is treated as zero.
Real-World Uses
Checking a contract or payment term. Terms like “payment within 10 business days” are only useful if you can count those days correctly — and as the FAQ below notes, 10 business days is roughly 14 calendar days, because two weekends usually sit inside the span. Planning a project schedule. A task that needs a set number of working days has a very different end date from the same number of calendar days; October 2026 offers 22 business days out of 31, which is the kind of split this tool shows before you commit to a deadline. Counting leave. Entering a holiday period shows how many working days it actually consumes — the business days in the range — rather than the longer calendar span, which is what most leave balances are charged against.
Benefits of a Business Days Calculator
- Inclusive day count matches how contracts count.
- Weekends shown separately for transparency.
- Your own holiday list — any country’s holidays.
- Never goes below zero on the net figure.
Features of Our Tool
- Instant results in your browser.
- No sign-up, no download, 100% free.
- Works on mobile, tablet and desktop.
- Clear step-by-step explanation below the tool.
- Private — your entries never leave your device.
Common Mistakes
- Counting weekends as available days — the classic missed deadline.
- Mixing inclusive and exclusive counts: decide once (this tool is inclusive) and state it.
- Forgetting that Friday–Saturday weekends (some Middle East countries) differ — this tool uses Saturday–Sunday; adjust manually for other weeks.
Common Mistakes to Avoid
The list above covers the big three — counting weekends, mixing counting conventions and assuming every country shares the same weekend. Two quieter errors also distort results. The first is entering holidays that fall on a Saturday or Sunday: the holiday box is meant for holidays on weekdays inside the range, and weekend holidays are already excluded by the weekend count, so including them subtracts the same day twice. The second is leaving the holiday box at zero out of habit and then treating the business-day figure as final: the tool cannot know your country’s holidays — the FAQ is explicit that you enter the count yourself — so a range containing a public holiday needs that number added before the net figure is quoted.
FAQ
How many business days are in October 2026?
22, out of 31 total days with 9 weekend days.
Are public holidays excluded automatically?
No — holidays vary by country and year, so you enter the count yourself for the range.
Is the end date included?
Yes — the count is inclusive of both dates, matching contract conventions.
What if the start date is after the end date?
The tool swaps them and counts the same range.
How do I add 10 business days to a date?
Use the business-days logic forward from your start date, skipping weekends — count 10 weekdays ahead (roughly 14 calendar days).
What if I enter more holidays than there are business days?
The net figure never goes below zero — as the Benefits list puts it, the tool floors it at zero. The business days and weekend days lines still show their raw counts, so you can see the range itself was counted correctly and only the subtraction was capped.
Can I count a range of a single day?
Yes. Pick the same date as start and end: because the count is inclusive, the total is one day, which lands in the business-day tally if it falls Monday to Friday and in the weekend tally if it falls on a Saturday or Sunday.