Hours to seconds
One h equals 3600 s. Type any number and the answer appears as you type — the maths happens in your browser.
Result
The same value in every unit
| Unit | Value |
|---|
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Common values
| hours | seconds |
|---|---|
| 1 h | 3600 s |
| 2 h | 7200 s |
| 3 h | 10800 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 |
| 500 h | 1800000 s |
| 1000 h | 3600000 s |
How to use
- Enter the number of hours in the field.
- The result in seconds updates on every keystroke.
- Use the table below for the values people look up most often.
Formula and reverse conversion
The formula
To convert by hand: s = h × 3600. Going back the other way, one s is 0.0002777777778 h.
How long a month and a year are here
A month here is the average Gregorian month, 30.44 days, and a year is 365.2425 days. That is the right basis for questions like “how many hours in three months”, but not for a specific calendar month.
s = h × 3600
Frequently asked questions
How many seconds are in one hours?
One h is 3600 s.
How do I convert hours to seconds?
Multiply by the factor: s = h × 3600.
Is the result exact?
The factors are the exact legal definitions, and up to ten significant digits are kept in the answer. Rounding happens only in the display.
How do I convert seconds back to hours?
One s is 0.0002777777778 h — or open the reverse page linked below.