Working Days Calculator — Count Business Days Between Dates
Count working days (Monday–Friday) between two dates. Useful for SLA tracking, project scheduling, invoice due dates, and sprint planning.
Why Count Working Days Separately
Calendar days and working days produce very different numbers for the same date range. A 14-day sprint has 10 working days. A 30-day payment term starting on Friday has 20–21 working days. The time difference calculator shows total days, and you can calculate working days by subtracting the weekend days in the range.
- SLA tracking: Service level agreements often specify business days — a "5 business day" SLA runs Monday through Friday only
- Invoice due dates: "Net 30" typically means 30 calendar days, but "30 business days" is much longer
- Project scheduling: Sprint planning, milestone gaps, and deliverable windows in business days
- HR and employment: Notice periods, probation end dates, leave accrual
- Legal deadlines: Court filings often use business day counting rules
Choose the Right Variant
- This page: Working days calculator — Monday–Friday business days between dates
- Time Difference Calculator: Total calendar days, hours, minutes
- Days Between Dates: Calendar day count for any period
- Time Until Deadline: Days remaining until a future date
How to Calculate Working Days
- Use the Time Difference Calculator to find the total calendar days between your start and end dates
- Count the number of full weeks in the range — multiply by 5 (working days per week)
- Add working days for any remaining partial week days (count only Mon–Fri)
- Subtract any public holidays that fall on working days in your range
- Formula: Working Days = (Total weeks × 5) + remaining weekdays – public holidays
Working Day Count Reference
- 1 week: 5 working days
- 2 weeks: 10 working days
- 1 month (4 weeks): ~20 working days (typically 20–23 depending on the month)
- 1 quarter (3 months): ~65 working days
- 1 year: ~261 working days (365 – 104 weekend days)
- Note: Public holidays reduce these counts — the US has 11 federal holidays, the UK has 8 bank holidays
Privacy and Data Handling
All date calculations run locally in your browser. No data is sent to any server.
Frequently Asked Questions
Does the working days calculator account for public holidays?
The time difference calculator shows calendar days and total working days (Mon–Fri), but it does not automatically account for public holidays — these vary by country, region, and year. To get an accurate business day count that excludes holidays, take the working day count and manually subtract the number of public holidays that fall on weekdays within your date range. For a US date range, check the official federal holiday calendar; for the UK, use the government's bank holiday list.
What does "Net 30" mean — calendar days or business days?
"Net 30" in invoicing conventionally means 30 calendar days from the invoice date — not business days. Payment is due within 30 calendar days regardless of weekends or holidays. Some contracts specify "Net 30 business days" which is significantly longer (roughly 6 weeks on the calendar). Always check your contract or invoice terms for the exact convention. "Net 10", "Net 15", and "Net 60" similarly refer to calendar days by default unless explicitly stated otherwise.
How do I add a specific number of working days to a date?
To find a date that is N working days after a start date: (1) divide N by 5 to get full weeks, (2) add that many weeks to the start date, (3) add the remaining days (accounting for not crossing weekends). For example, 10 working days from Monday January 6 = 2 full weeks = Monday January 20. For 12 working days: add 2 weeks = January 20, plus 2 more working days = Wednesday January 22. Subtract any public holidays that fall on weekdays in the range.