Hours to Seconds Converter
Convert hours to seconds instantly. 1 h = 3,600 s. Free two-way converter with the formula and a quick reference table.
How to convert hours to seconds
seconds = hours × 3,600
One hour equals 3,600 seconds, so to convert hours to seconds you multiply by 3,600. Going the other way, one second is 2.7778e-4 hours. Both units measure time, so the conversion is an exact ratio that never changes.
10 hours = 36,000 seconds. Multiply your hour figure by the factor above (or just type it into the box) to convert any amount.
hours to seconds table
| hours (h) | seconds (s) |
|---|---|
| 1 | 3,600 |
| 2 | 7,200 |
| 3 | 10,800 |
| 5 | 18,000 |
| 10 | 36,000 |
| 20 | 72,000 |
| 25 | 90,000 |
| 50 | 180,000 |
| 100 | 360,000 |
| 250 | 900,000 |
| 500 | 1,800,000 |
| 1,000 | 3,600,000 |
Frequently asked questions
How many seconds are in a hour?
One hour equals 3,600 seconds. So to convert, multiply the number of hours by 3,600.
How do I convert hours to seconds?
Multiply by 3,600, or simply enter the value in the converter above — it does the math instantly and works both ways.
Is this conversion exact?
Yes — both units measure the same quantity, so the ratio is fixed and this uses the standard internationally-agreed factor.