Business days calculator
Count working days from 1 to 31 January 2026 with your own weekend days, a holiday list and inclusive or exclusive end dates.
- Runs in your browser
- No upload
- Instant result
Assumptions & formula
Formula and assumptions
N = Σ(valid d); 0=Sun/So/Do/Dim/Dom/Dom/Dom/Min … 6=Sat/Sa/Sáb/Sam/Sáb/Sab/Sáb/Sab
Only entered holidays are excluded; no national holiday calendar is assumed. Sunday=0 through Saturday=6. Choose inclusive/exclusive endpoints. Maximum range: 36,600 days. Enter at least one weekend weekday; empty entries are invalid.
Results
Enter values and press Calculate to see the result here.
How to use this calculator
- Set inputs and units
Set the date range, the weekend numbers 0–6, any holidays explicitly, and whether the endpoints are inclusive or exclusive.
- Calculate
Check this worked example: 2026-01-01…2026-01-07; weekend=0,6; holiday=2026-01-01; inclusive → days=7, businessDays=4, excluded=3
- Results
Compare the eligible days with the excluded ones. A holiday that already falls on a weekend isn't subtracted twice.
Questions and limits
Which weekday numbers should I enter?
Sunday is 0 and Saturday is 6. Supply your own holiday dates; no national calendar is downloaded.
Which input errors should I correct?
The end date must come after the start date. Weekend entries must be integers from 0–6, and the span can be at most 36,600 days.
What does this calculation leave out?
Counts the selected calendar dates only. It doesn't cover legal deadlines, half-days, shift schedules or country-specific entitlements.