Convert hours to seconds
Enter a value in hours to convert it to seconds.
hours to seconds reference
| hours | seconds |
|---|---|
| 1 h | 3600 s |
| 2 h | 7200 s |
| 5 h | 18000 s |
| 10 h | 36000 s |
| 25 h | 90000 s |
| 50 h | 180000 s |
| 100 h | 360000 s |
The conversion factor
One hour is 3600 seconds. So to convert, multiply your figure in hours by 3600. To go the other way, multiply seconds by 0.00027778.
Doing it in your head
For a quick estimate, round the factor: roughly "times 3600". Use the exact converter above when the number matters.
Where this conversion comes up
Durations in code and spreadsheets, timeouts, and project estimates.
See the common unit conversions cheat sheet for the factors worth memorising.
Related tools
Frequently asked questions
How many seconds are in a hour?
1 hour = 3600 seconds.
What is the formula to convert hours to seconds?
Multiply the number of hours by 3600. To go back the other way, multiply seconds by 0.00027778.
What is 10 hours in seconds?
10 hours = 36000 seconds. The reference table below lists more common values.
Is this converter accurate?
It uses the internationally defined conversion factors and computes at full floating-point precision, then rounds only the displayed result. For everyday purposes it is exact; for legal, engineering or scientific work, confirm the required number of significant figures.
Does it work offline?
Yes. The conversion runs in your browser with no server call, so it keeps working with no connection, and nothing you enter is uploaded.
Last reviewed: September 2026. Figures and formulas are checked against their published sources; see the site's data notes.