Convert hours to seconds instantly. Enter a value below, or use the formula and reference table further down the page.
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How to convert hours to seconds
Multiply the value by 3600.
s = h × 3600Example: 10 h = 36000 s.
Hours to Seconds conversion table
| Hours (h) | Seconds (s) |
|---|---|
| 1 h | 3600 s |
| 2 h | 7200 s |
| 3 h | 10800 s |
| 4 h | 14400 s |
| 5 h | 18000 s |
| 10 h | 36000 s |
| 15 h | 54000 s |
| 20 h | 72000 s |
| 25 h | 90000 s |
| 50 h | 180000 s |
| 100 h | 360000 s |
Frequently asked questions
How many seconds is 1 hour?
1 hour equals 3600 seconds.
What is the formula to convert h to s?
To convert h to s, multiply the value by 3600. The full formula is: s = h × 3600.
How do I convert seconds back to hours?
Use the same calculator above and type your value into the seconds field instead — it converts in both directions. Or use the reverse formula: h = s ÷ 3600.
Is the h to s conversion exact?
The conversion factor used here (3600) is the standard internationally defined value. Results on this page are rounded to four decimal places for readability.