The short answer
8 hours 15 minutes = 8.25 decimal hours, because 15 ÷ 60 = 0.25. Going back, 7.75 hours is 7 hours and 0.75 × 60 = 45 minutes, or 7:45.
Quick reference
0.25 = 15 minutes, 0.5 = 30 minutes, 0.75 = 45 minutes. Every minute is 0.0167 hours, which is why 10 minutes is 0.17 (rounded) and 20 minutes is 0.33. Most payroll systems round to 2 decimals.
Minutes to decimal
| Minutes | Decimal hours |
|---|---|
| 5 | 0.0833 |
| 6 | 0.1000 |
| 10 | 0.1667 |
| 12 | 0.2000 |
| 15 | 0.2500 |
| 20 | 0.3333 |
| 30 | 0.5000 |
| 40 | 0.6667 |
| 45 | 0.7500 |
| 50 | 0.8333 |
| 55 | 0.9167 |
Common decimal hours
| Decimal hours | Hours:minutes |
|---|---|
| 0.25 | 0:15 |
| 0.5 | 0:30 |
| 0.75 | 0:45 |
| 1 | 1:00 |
| 1.5 | 1:30 |
| 2 | 2:00 |
| 4 | 4:00 |
| 6 | 6:00 |
| 7.5 | 7:30 |
| 8 | 8:00 |
| 8.25 | 8:15 |
| 8.5 | 8:30 |
| 10 | 10:00 |
| 12 | 12:00 |
FAQ
How do I convert minutes to decimal hours?
Divide the minutes by 60. 45 minutes is 0.75 hours; 20 minutes is 0.33 hours.
How do I convert decimal hours to minutes?
Multiply the decimal part by 60. 0.4 hours is 24 minutes, so 6.4 hours is 6:24.
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