Time to Decimal Calculator — Convert HH:MM:SS to Decimal
Convert hours, minutes, and seconds to decimal hours. For example, 2 hours 45 minutes equals 2.75 decimal hours. See also our Decimal to Time Calculator and Hours Calculator.
How to Convert Time to Decimal Hours
- Enter the hours, minutes, and seconds.
- Divide minutes by 60 to get the decimal fraction of an hour.
- Divide seconds by 3600 to get the decimal fraction of an hour.
- Add hours + decimal minutes + decimal seconds for the total.
- Click Calculate to see the result.
Formula
Decimal Hours = Hours + (Minutes / 60) + (Seconds / 3600)
Or: Decimal Hours = Total Seconds / 3600
Example
Time: 2 hours, 45 minutes, 0 seconds
Decimal = 2 + (45 / 60) + (0 / 3600)
Decimal = 2 + 0.75 + 0
Result: 2.75 decimal hours
Time to Decimal Reference Table
| Minutes | Decimal | Minutes | Decimal |
|---|---|---|---|
| 5 min | 0.083 | 35 min | 0.583 |
| 10 min | 0.167 | 40 min | 0.667 |
| 15 min | 0.250 | 45 min | 0.750 |
| 20 min | 0.333 | 50 min | 0.833 |
| 25 min | 0.417 | 55 min | 0.917 |
| 30 min | 0.500 | 60 min | 1.000 |
Frequently Asked Questions
Why convert time to decimal?
Decimal hours are used in payroll, billing, and project management because they simplify multiplication with hourly rates.
What is 30 minutes in decimal?
30 minutes = 0.5 decimal hours (30 / 60 = 0.5).
How do I convert 7 hours 20 minutes to decimal?
7 + (20/60) = 7 + 0.333 = 7.333 decimal hours.
What is the decimal equivalent of 1 hour 15 minutes?
1 hour 15 minutes = 1 + (15/60) = 1.25 decimal hours.
Do payroll systems use decimal time?
Yes, most payroll systems convert clock times to decimal hours for wage calculations. For example, 8:30 to 5:00 with a 30-minute break = 8.0 decimal hours.