Why Time Math Trips Everyone Up
Time is base-60, not base-10: 7:45 plus 2:30 is 10:15, not 9:75. This calculator handles the carrying for you in two modes: duration between two clock times (with overnight shifts handled automatically) and adding/subtracting time amounts.
Worked Examples
- Shift from 21:30 to 06:15 → 8 h 45 min (the calculator recognizes the span across midnight).
- 3 h 50 min + 2 h 25 min → 6 h 15 min.
Decimal Hours for Timesheets
Payroll systems usually want decimal hours: minutes ÷ 60. The calculator shows both formats.
| Minutes | Decimal | Minutes | Decimal |
|---|---|---|---|
| 15 min | 0.25 h | 40 min | 0.67 h |
| 20 min | 0.33 h | 45 min | 0.75 h |
| 30 min | 0.50 h | 50 min | 0.83 h |
8 h 45 min = 8.75 decimal hours — at $20/hour that's $175, computed directly.