Convert minutes to hours
To convert minutes to hours: one minute is 0.016666667 hours, so 90 minutes is 1.5 hours. The factor is exact.
In hours
- Conversion factor Exact.
- 1 minute = 0.0166666667 hours
- In every unit
- 5,400,000 ms 5,400 s 90 min 1.5 h 0.0625 day 0.0089286 week 0.0020534 month 0.00017112 year
- As hours and minutes
- 1:30
- 7.25 decimal hours Multiply the fractional part by 60: 0.25 x 60 = 15 minutes.
- 7 hours 15 minutes (7:15)
- And the other way
- 7:15 is 7.25 decimal hours
- Minutes that convert cleanly
- 15 = 0.25, 30 = 0.50, 45 = 0.75
| Minutes | Decimal hours | Minutes | Decimal hours |
|---|---|---|---|
| 0 | 0 | 30 | 0.5 |
| 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 |
How the Time Converter works
One minute is exactly 0.0166666667 hours. That is a fixed convention, not a measurement: 60 seconds to the minute, 60 minutes to the hour, 24 hours to the day and 7 days to the week, with the second as the SI base unit. Leap seconds adjust the clock against the Earth's rotation; they do not change the length of a minute or an hour as a unit, so this factor is exact.
Worked through: 90 min x 0.0166666667 = 1.5 h.
Going the other way, one hour is 60 minutes.
For mental arithmetic: Divide by 6 and move the decimal point one place left. 90 minutes is 9 divided by 6, so 1.5 hours.
Going this way the result is almost always a decimal, and the question is how many places to keep. Payroll systems vary: some round to two decimals, some to the nearest tenth of an hour, and some to the nearest quarter hour, which can move a day's pay by several minutes' worth. 100 minutes is 1.6667 hours, and whether that is paid as 1.67, 1.7 or 1.75 is a policy rather than an arithmetic question. The exact figure is here; which rounding applies is in your contract.
Precision is worth matching to the input. A measurement given as 15 min carries one or two significant figures, and reporting its conversion to six implies a precision the original never had.
Time Converter FAQ
How many hours are in a minute?
0.016666667. That is exact by convention: the units of the clock are fixed multiples of the second.
What is 90 min in hours?
1.5 h. Multiply by 0.016666667: 90 min x 0.0166666667 = 1.5 h.
How do I convert hours back to minutes?
Divide by 0.016666667, or equivalently multiply by 60. One hour is 60 minutes. The two factors are reciprocals, so you only need to remember one of them.
Is there a quick way to do this in my head?
Divide by 6 and move the decimal point one place left. 90 minutes is 9 divided by 6, so 1.5 hours. It is close enough for everyday use.
More from the Time Converter
- hours to minutes
- seconds to hours
- seconds to minutes
- hours to seconds
- minutes to seconds
- hours to days
- years to hours
- milliseconds to seconds