Payroll
Minutes to Decimal Hours: A Payroll Guide for Military Time Cards
Convert minutes to decimal hours for payroll: the divide-by-60 rule, a quick reference table, how wrong decimals underpay workers, rounding rules and converting back to minutes.
By Free Military Time Calculator Team ·
To convert minutes to decimal hours, divide the minutes by 60: 15 minutes is 0.25 hours, 30 minutes is 0.50 hours and 45 minutes is 0.75 hours. Payroll systems multiply decimal hours by the hourly rate, so the conversion decides how much a worker is paid.
Why Payroll Uses Decimal Hours
An hour has 60 minutes, while a dollar has 100 cents. Payroll software multiplies hours by a rate, so it needs hours as a decimal number. 7 hours 30 minutes becomes 7.50 hours, and 7.50 × $18.00 = $135.00.
The Divide-by-60 Rule
- Keep the whole hours.
- Divide the minutes by 60.
- Add the two and round to 2 decimal places.
Example: 6 hours 40 minutes → 40 ÷ 60 = 0.667 → 6.67 hours.
Quick Reference Table
| Minutes | Decimal | Minutes | Decimal |
|---|---|---|---|
| 5 | 0.08 | 35 | 0.58 |
| 10 | 0.17 | 40 | 0.67 |
| 15 | 0.25 | 45 | 0.75 |
| 20 | 0.33 | 50 | 0.83 |
| 25 | 0.42 | 55 | 0.92 |
| 30 | 0.50 | 60 | 1.00 |
The full 0–59 table is on the military minutes conversion page.
How Wrong Decimals Underpay Workers
Copying minutes after the decimal point is the most common payroll error.
| Time worked | Wrong entry | Correct entry | Lost at $20/hour |
|---|---|---|---|
| 8 h 45 min | 8.45 | 8.75 | $6.00 |
| 7 h 30 min | 7.30 | 7.50 | $4.00 |
| 9 h 50 min | 9.50 | 9.83 | $6.60 |
Over a 5-shift week, an 8.45-for-8.75 mistake costs $30.00.
Rounding Rules
Payroll rounds decimal hours in 3 common ways:
- Hundredths: 2 decimal places (7.33). Most precise.
- Tenths: 6-minute steps, where each tenth of an hour equals 6 minutes.
- Quarter hours: 15-minute steps with the 7-minute rule: 1–7 minutes round down and 8–14 minutes round up.
The U.S. Department of Labor allows rounding only when it averages out over time and does not shortchange employees.
Converting Decimal Hours Back to Minutes
Multiply the decimal part by 60: 7.4 hours → 0.4 × 60 = 24 minutes → 7 h 24 min. 38.75 hours → 0.75 × 60 = 45 minutes → 38 h 45 min.
Military Time Cards to Decimal Hours
Military time cards need one extra step: find the hours worked first.
- Clock in 0730, clock out 1615.
- 1615 − 0730 → 8 h 45 min.
- 45 ÷ 60 = 0.75 → 8.75 decimal hours.
The time card calculator does this for a full week and shows overtime after 40 hours.