Guide / decimal hours
Hours and minutes to decimal hours
Time cards often show hours and minutes, while payroll systems may show decimal hours. The numbers look similar but follow different rules. In 7:30, the “30” means 30 minutes, which is half an hour; the decimal value is 7.50, not 7.30. The conversion is hours + minutes ÷ 60.
Common conversions
| Hours:minutes | Calculation | Decimal display |
|---|---|---|
| 0:15 | 15 ÷ 60 | 0.25 |
| 0:30 | 30 ÷ 60 | 0.50 |
| 0:45 | 45 ÷ 60 | 0.75 |
| 7:20 | 7 + 20 ÷ 60 | 7.33 |
| 7:30 | 7 + 30 ÷ 60 | 7.50 |
| 8:06 | 8 + 6 ÷ 60 | 8.10 |
Why totals should start with minutes
Three shifts of 7:20 total 22:00 exactly: three times 440 minutes is 1,320 minutes. If you first round each shift to 7.33 decimal hours and add those displayed figures, you get 21.99, a display artifact. Work Hours Desk adds exact minutes before showing a two-decimal decimal total.
Display rounding is not punch rounding
7:29 equals about 7.4833 decimal hours, displayed as 7.48. 7:31 equals about 7.5167, displayed as 7.52. The underlying minutes stay unchanged. This tool does not round clock-in or clock-out punches to the nearest interval; if an employer uses a permitted rounding policy, its records may differ.