Keep the whole hours, divide the remaining minutes by 60, and add the two values. For example, 7 hours 45 minutes becomes 7 + 45 ÷ 60 = 7.75 hours.
Decimal hours = whole hours + minutes ÷ 60Use the minutes-divided-by-60 formula
An hour contains 60 minutes. That means 15 minutes is 0.25 of an hour, 30 minutes is 0.50, and 45 minutes is 0.75. Add that fraction to the whole-hour portion of the duration.
This conversion should happen after you calculate paid time. Subtract unpaid breaks in minutes first, then convert the remaining duration.
Quick decimal-hours chart
These common values are exact. Other minute values can be calculated by dividing by 60.
| Minutes | Decimal | Example total |
|---|---|---|
| 0 | 0.00 | 8h 00m = 8.00 |
| 15 | 0.25 | 8h 15m = 8.25 |
| 30 | 0.50 | 8h 30m = 8.50 |
| 45 | 0.75 | 8h 45m = 8.75 |
| 50 | 0.83 | 8h 50m ≈ 8.83 |
Why 7.30 is not 7 hours 30 minutes
The digits after a decimal point represent tenths and hundredths of an hour. The value 0.30 of an hour equals 18 minutes because 0.30 × 60 = 18. Seven hours 30 minutes is 7.50 decimal hours.
When a system displays 7:30, it usually means hours and minutes. When it displays 7.50, it usually means decimal hours. Preserve the label so the two formats are never confused.
Round once, after totaling the source time
Repeatedly rounding each shift can move a weekly total away from the original timestamps. Keep paid minutes as the source of truth, add the full period, then format the display to two decimals when needed.
If an employer, client, or billing system specifies a rounding method, follow that method for the official submission. A personal calculator should not silently invent one.
Use decimal hours carefully for pay estimates
Once the duration is correct, multiplying decimal hours by an hourly rate creates a basic gross-pay estimate. Different jobs or rate periods should be calculated separately before the results are combined.
EarnTrace shows both hours-and-minutes and decimal hours, so the readable duration and the calculation format stay together.
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