What this calculator does
Given a start time, end time and break minutes, it computes:
- Total hours, wall-clock duration of the shift.
- Paid hours, total minus unpaid break.
- Night hours and estimated pay, using the entered rate and night premium; optional previous-shift end time gives a clock-time rest-gap estimate.
Common shift patterns
| Shift | Hours | Notes |
|---|---|---|
| General (9–6) | 9 hrs (8 paid) | 1 hr lunch deducted |
| Morning (6–14) | 8 hrs | Manufacturing / BPO |
| Evening (14–22) | 8 hrs | Manufacturing / BPO |
| Night (22–06) | 8 hrs | Premium depends on contract and applicable law |
| 12-hour rotational | 12 hrs (11 paid) | Healthcare / process plants |
How shift length is worked out
Shift length is the end time minus the start time, minus any unpaid break. When a shift crosses midnight, add 24 hours to the end time before subtracting, a 22:00 to 06:00 night shift is 8 hours, not minus 16. Converting the result to decimal hours (divide minutes by 60) makes it ready for payroll and pay-rate maths.
Common mistakes to avoid
- Forgetting to remove an unpaid 30-minute meal break.
- Mixing 12-hour and 24-hour times on the same sheet.
- Rounding every punch upward instead of using your employer's stated rounding rule.
For a full week of shifts, use the Work Hours Calculator or print a weekly timesheet.