Convert hours to seconds
Converting hours to seconds is a common time task, whether you are checking a recipe, a spec sheet, a travel distance or a homework problem. Since 1 h equals 3,600 s, the math is a single multiplication — and this page does it for you instantly, with the formula, a table of common values and answers to the questions people ask most.
Exact factor
How to convert hours to seconds
To convert hours to seconds, multiply the number of hours by 3,600. For example, 10 h × 3,600 = 36,000 s.
s = h × 3,600
- Write down the value in hours you want to convert.
- Multiply it by 3,600 (the exact h→s factor).
- The result is your value in seconds. Check it below with the converter or the table.
Conversion table
Common values of hours and their equivalents in seconds:
| h | s |
|---|---|
| 1 | 3,600 |
| 2 | 7,200 |
| 3 | 10,800 |
| 4 | 14,400 |
| 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 |
About these units
Hour (h). An hour equals 60 minutes or 3,600 seconds, dividing the day into 24 parts. Work schedules, travel times and billing are commonly expressed in hours.
Second (s). The second is the SI base unit of time, defined by the cesium-133 atomic transition frequency of 9,192,631,770 hertz. It is the foundation of all time measurement.
Frequently asked questions
How do I convert hours to seconds?
To convert hours to seconds, multiply the number of hours by 3,600. For example, 10 h × 3,600 = 36,000 s. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many seconds are in 1 hour?
1 h = 3,600 s. That is the fixed relationship used by this converter and by international standards.
How many hours are in 1 second?
1 s = 0.000277778 h. If you are converting in the opposite direction, use our Second to Hour converter for the dedicated table and FAQ.
Is the hours to seconds conversion exact?
Yes. Both units are defined by international agreement, so the factor of 3,600 is exact. Displayed results are rounded to 6 significant digits only for readability.
What is hour used for?
An hour equals 60 minutes or 3,600 seconds, dividing the day into 24 parts. Work schedules, travel times and billing are commonly expressed in hours.