Convert seconds to hours
To convert seconds to hours: one second is 0.0002777778 hours, so 3,600 seconds is 1 hour. The factor is exact.
In hours
- Conversion factor Exact.
- 1 second = 0.0002777778 hours
- In every unit
- 3,600,000 ms 3,600 s 60 min 1 h 0.041667 day 0.0059524 week 0.001369 month 0.00011408 year
- As hours and minutes
- 1:00
- 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 second is exactly 0.0002777778 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: 1,800 s x 0.0002777778 = 0.5 h.
Going the other way, one hour is 3,600 seconds.
For mental arithmetic: Divide by 3,600, or halve it and divide by 1,800 if that is easier to do in your head.
3,600 is a factor people reach for without checking, and it is worth knowing where it comes from: it is 60 times 60, not a definition of its own. The conversion matters most in two places that look nothing alike. Energy billing uses it (a watt-second is a joule and a kilowatt-hour is 3.6 million of them), and so does log analysis, where durations arrive in seconds and have to be reported in hours.
Precision is worth matching to the input. A measurement given as 60 s 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 second?
0.0002777778. That is exact by convention: the units of the clock are fixed multiples of the second.
What is 3,600 s in hours?
1 h. Multiply by 0.0002777778: 1,800 s x 0.0002777778 = 0.5 h.
How do I convert hours back to seconds?
Divide by 0.0002777778, or equivalently multiply by 3,600. One hour is 3,600 seconds. 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 3,600, or halve it and divide by 1,800 if that is easier to do in your head. It is close enough for everyday use.
More from the Time Converter
- hours to seconds
- minutes to hours
- hours to minutes
- milliseconds to seconds
- seconds to minutes
- seconds to milliseconds
- minutes to seconds
- hours to days