Convert Hours to Seconds
hr to s · time conversion
What are hours and seconds?
An hour is 60 minutes, or 3,600 seconds. The second is the SI base unit of time, defined by the vibration of a cesium atom. For reference: there are 86,400 seconds in a day and 604,800 in a week.
How to convert hours to seconds
1 hr = 3,600 s. To convert, multiply the number of hours by 3,600. For example, 5 hr = 18,000 s, and 20 hr = 72,000 s. To go the other way, multiply seconds by 0.000277778 (since 1 s = 0.000277778 hr).
Hours to Seconds conversion table
| Hours (hr) | Seconds (s) |
|---|---|
| 1 | 3,600 |
| 5 | 18,000 |
| 10 | 36,000 |
| 30 | 108,000 |
| 60 | 216,000 |
| 90 | 324,000 |
| 365 | 1,314,000 |
FAQ
What is 1 hr in s?
1 hr = 3,600 s. To convert any amount, multiply the number of hours by 3,600.
How do I convert seconds back to hours?
Go the other way: 1 s = 0.000277778 hr, so multiply seconds by 0.000277778 to get hours.
Is a hour bigger than a second?
Yes — 1 hr is the larger unit, equal to 3,600 s.
Are these time conversions exact?
They use the standard internationally-defined conversion factors. Results are rounded to six significant figures for readability, which is accurate enough for everyday and most technical use.