Calculate tenths of an hour from a duration or timecard, or convert tenths back to hours and minutes with optional rounding and pay estimates.
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Tenth of an Hour Formula
Tenths = Minutes / 6
Decimal Hours = Tenths / 10
- Tenths = number of tenth-hour units (0.1 hr each)
- Minutes = total elapsed minutes
- Decimal Hours = hours expressed as a decimal
One tenth of an hour equals exactly 6 minutes. To round, divide minutes by 6 and round the result to a whole number, then divide by 10 to express it in hours. Timecard mode subtracts unpaid break time from the clock span before converting.
Minute to Tenth-Hour Conversion
Use this table to convert minutes to tenths at a glance. Values shown use nearest-tenth rounding.
| Minutes | Tenths | Decimal Hours |
|---|---|---|
| 0–2 | 0 | 0.0 |
| 3–8 | 1 | 0.1 |
| 9–14 | 2 | 0.2 |
| 15–20 | 3 | 0.3 |
| 21–26 | 4 | 0.4 |
| 27–32 | 5 | 0.5 |
| 33–38 | 6 | 0.6 |
| 39–44 | 7 | 0.7 |
| 45–50 | 8 | 0.8 |
| 51–56 | 9 | 0.9 |
| 57–60 | 10 | 1.0 |
Tenths to Minutes
| Tenth | Minutes | Tenth | Minutes |
|---|---|---|---|
| 0.1 | 6 | 0.6 | 36 |
| 0.2 | 12 | 0.7 | 42 |
| 0.3 | 18 | 0.8 | 48 |
| 0.4 | 24 | 0.9 | 54 |
| 0.5 | 30 | 1.0 | 60 |
Examples and FAQ
Example 1. You worked 1 hour and 15 minutes. Total minutes = 75. 75 / 6 = 12.5, which rounds to 13 tenths, or 1.3 hours.
Example 2. Clocked in at 8:00 and out at 4:30 with a 30-minute unpaid break. Clock span = 8.5 hours. Worked = 8.0 hours = 80 tenths.
Why use tenths? Payroll, legal billing, and trucking logs round to 6-minute units so totals stay clean in decimal form. Adding 1.3 + 2.4 + 0.5 is faster than adding mixed hours and minutes.
Does 1 minute round to a tenth? No. With nearest-tenth rounding, anything under 3 minutes rounds to 0. Use the "next tenth up" option if your system bills any partial unit as a full tenth.
Is a tenth the same as a quarter hour? No. A quarter hour is 15 minutes; a tenth of an hour is 6 minutes. Some employers round to the nearest quarter instead.
