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Time
Hours to Seconds
Convert hours (hr) to seconds (s). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 hr = 3600 s
Hours to Seconds Conversion Table
Common values, ready to copy:
| hours | seconds |
|---|---|
| 1 hr | 3600 s |
| 2 hr | 7200 s |
| 5 hr | 18000 s |
| 10 hr | 36000 s |
| 25 hr | 90000 s |
| 50 hr | 180000 s |
| 100 hr | 360000 s |
| 1,000 hr | 3.6000e+6 s |
Formula
seconds = hours × 3600
Time uses fixed SI seconds. A day is exactly 86,400 seconds; a year (Julian) is 365.25 days = 31,557,600 seconds.
About Hours and Seconds
Hours (hr): Sixty minutes, derived from the Egyptian division of day and night into 12 parts each; the 24-hour day is much older than the modern second. Common uses: Work schedules, sleep tracking, journey lengths, billing (hourly rates), and any time interval longer than a few minutes.
Seconds (s): The SI base unit of time, defined since 1967 by 9,192,631,770 oscillations of cesium-133 (atomic clock precision is the most accurate unit definition in metrology). Common uses: Athletics timing, scientific measurement, computer benchmarking, music (BPM), and every other use of precise time.
How the conversion works
Time uses fixed SI seconds. A day is exactly 86,400 seconds; a year (Julian) is 365.25 days = 31,557,600 seconds.
The exact relationship is seconds = hours × 3600, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between hours and seconds comes up wherever time measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.