MihsabaSubtract start time from end time after converting both to minutes. For an overnight shift ending the next day, add 24 hours when the end clock time is earlier. Subtract unpaid breaks before converting minutes back to hours.
Formula
Net minutes = (end − start + 1,440 if overnight) − break minutes; decimal hours = net minutes / 60.
How to calculate
- Convert start and end clock times to minutes since midnight.
- Add 1,440 minutes if the end belongs to the following day.
- Subtract the unpaid break and express hours/minutes or decimal hours.
Worked examples
| Scenario | Calculation | Answer |
|---|---|---|
| 09:00 to 17:30 | 510 minutes | 8 h 30 min |
| 22:00 to 06:00 overnight | 480 minutes | 8 hours |
| 08:00 to 16:30 minus 30-min break | 510 − 30 = 480 minutes | 8 net hours |
Important limitation
Seven hours and thirty minutes equals 7.5 decimal hours, not 7.30. This method assumes a clock interval shorter than 24 hours; use a date calculator for multiple days.
Common question
How do I calculate overnight work hours?
If the end clock time is earlier, treat it as occurring on the next day; then subtract any break.