The minutes-to-decimal-hours formula
There are 60 minutes in an hour, so each minute is 1/60 of an hour. For 24.59 minutes: 24.59 ÷ 60 = 0.409833..., which is about 0.4098 decimal hour.
Convert hours and minutes together
When you have a value such as 7 hours 45 minutes, keep the 7 whole hours and convert only the minutes: 45 ÷ 60 = 0.75. The result is 7.75 decimal hours.
Quick conversion chart
| Minutes | Decimal hours | Minutes | Decimal hours |
|---|---|---|---|
| 1 | 0.0167 | 30 | 0.5000 |
| 5 | 0.0833 | 35 | 0.5833 |
| 10 | 0.1667 | 40 | 0.6667 |
| 15 | 0.2500 | 45 | 0.7500 |
| 20 | 0.3333 | 50 | 0.8333 |
| 25 | 0.4167 | 55 | 0.9167 |
For payroll or billing, the required rounding rule may be different from simple mathematical rounding. Follow the policy used by your organization.
Decimal hours are not minutes after the decimal point
7.30 decimal hours does not mean 7 hours 30 minutes. The .30 is three-tenths of an hour: 0.30 × 60 = 18 minutes. Therefore 7.30 decimal hours equals 7 hours 18 minutes.
This is one of the most common errors in timesheets because clock notation and decimal notation look similar.
Timesheet example
Suppose an employee works from 9:10 to 16:00 with a 45-minute break. The elapsed time is 6 hours 50 minutes. Subtract 45 minutes to get 6 hours 5 minutes. Convert 5 minutes to decimal: 5 ÷ 60 = 0.0833. The net time is approximately 6.0833 hours.
How many decimal places should you use?
Four decimal places are useful for checking a conversion, while two decimals are common for invoices and summaries. Do not round each small interval too early if you will add many entries; total the precise values first and round the final result according to the required rule.
Convert decimal hours back to hours and minutes
Keep the whole-number hours, multiply the decimal part by 60, and round the minutes as needed. For 10.187 hours, keep 10 hours and calculate 0.187 × 60 = 11.22 minutes, giving about 10 hours 11 minutes.
When to use a calculator
A converter is useful when you have many time entries, unusual decimal values or payroll data that must be checked consistently. It also helps distinguish values such as 31.49 decimal hours from 31 hours 49 minutes.
Frequently asked questions
What is 30 minutes as a decimal hour?
30 ÷ 60 = 0.5 hour.
What is 45 minutes as a decimal?
45 ÷ 60 = 0.75 hour.
How do I convert 24.59 minutes to decimal hours?
24.59 ÷ 60 ≈ 0.4098 decimal hour.
Is 7.50 decimal hours the same as 7 hours 50 minutes?
No. 0.50 hour is 30 minutes, so 7.50 decimal hours is 7 hours 30 minutes.
Enter your own values, keep the assumptions visible and use this guide to understand the formula behind the result.