Hours to Decimal Calculator
Convert hours and minutes into decimal hours for payroll, spreadsheets, or time-tracking software. Type the hours and minutes — the decimal answer updates instantly.
How to use this calculator
- Type the whole hours from your timesheet.
- Type the minutes (0 to 59).
- The decimal answer updates as you go — copy it into your payroll system, your spreadsheet, or wherever it needs to land.
A real example: a typical workday
You clocked in at 8:00 a.m., out at 12:00 p.m. for an early-afternoon meeting, then back in at 1:00 p.m. and out at 5:30 p.m. That's a morning block of 4 hours and an afternoon block of 4 hours 30 minutes — total 8 hours 30 minutes.
In decimal hours: 8 + (30 ÷ 60) = 8.5. In total minutes: 8 × 60 + 30 = 510.
The conversion matters because most payroll systems multiply hours by an hourly rate to compute pay. At $20/hour, your day is 8.5 × $20 = $170. If you tried to multiply "8:30" by $20 directly, the math wouldn't work — that's why payroll converts to decimals first.
How decimal conversion works
Three things to know that catch people out:
- 1.30 is not 1 hour 30 minutes. A timesheet showing "1.30" means 1 hour and 0.30 of an hour, which is 18 minutes — not 30. 1 hour 30 minutes in decimal is 1.5, not 1.30. This is the single biggest mistake people make reading timesheets.
- The clean conversions: 15/30/45 minutes. 15 min = 0.25 hours, 30 min = 0.50, 45 min = 0.75. These are the only minute values that produce clean decimals — every other minute creates a repeating decimal.
- Round consistently. Most payroll rounds to two decimal places (8.50, not 8.5167 for 8h 31m). Some employers use the "7-minute rule" — round to the nearest quarter hour at clock-in and clock-out — but that's a payroll policy, not a math rule.
Quick reference: minutes to decimal hours
| Minutes | Decimal | Minutes | Decimal |
|---|---|---|---|
| 5 | 0.0833 | 35 | 0.5833 |
| 10 | 0.1667 | 40 | 0.6667 |
| 15 | 0.25 | 45 | 0.75 |
| 20 | 0.3333 | 50 | 0.8333 |
| 25 | 0.4167 | 55 | 0.9167 |
| 30 | 0.50 | 60 | 1.00 |
For times like 8h 23m, multiply: 8 + (23 ÷ 60) = 8.3833 decimal hours.
Where decimal hours come up
- Payroll systems. Almost every payroll system stores time in decimal hours. ADP, Gusto, QuickBooks, Workday — all of them. You'll convert clock-in/out times to decimals before entry.
- Excel and Google Sheets. Spreadsheets handle time arithmetic, but only if everything's in decimal hours. Subtracting "5:30 p.m." from "8:00 a.m." is a quirk; subtracting 17.5 from 8 is just math.
- Hourly invoicing. Freelancers, lawyers, contractors — anyone who bills hourly. Invoicing 2h 45m gets weird quickly; invoicing 2.75 hours times your rate is straightforward.
- PTO and sick-day accruals. Most accrual systems track time in decimal hours. You earn 1.34 hours of PTO per pay period, not "1 hour 20 minutes."
Frequently asked questions
How do you convert hours and minutes to decimal?
Divide the minutes by 60 and add to the hours. So 8 hours 30 minutes = 8 + (30 ÷ 60) = 8.5 decimal hours. 1 hour 45 minutes = 1.75 decimal hours.
Why does payroll use decimal hours?
Payroll systems multiply hours by a pay rate, and decimals multiply cleanly. "8.5 × $20" gives you $170 immediately. Doing the same with 8 hours 30 minutes requires an extra conversion step every time, so payroll standardizes on decimals.
What is 1.30 in decimal hours?
1.30 already IS a decimal — it means 1 hour and 0.30 of an hour, which is 18 minutes (0.30 × 60). It does NOT mean 1 hour 30 minutes; that would be 1.5. This trips people up: a timesheet showing 1.30 means 18 minutes past the hour, not half past.
How do I convert 7:45 to decimal hours?
7 hours 45 minutes = 7 + (45 ÷ 60) = 7.75 decimal hours. The minute-to-decimal conversions to memorize: 15 min = 0.25, 30 min = 0.50, 45 min = 0.75.