An hour is defined as exactly 3,600 seconds — a simple, fixed time conversion.
How it works
Multiplying hours by 3,600 gives seconds; dividing seconds by 3,600 gives hours back. Type into either field and the other updates instantly.
What this does not include
This does not include minutes — for that intermediate unit, use this site’s minutes-to-seconds calculator instead.
How to use this calculator
- Enter a value in either hours or seconds — the other field fills in automatically.
Frequently asked questions
Where is this conversion most commonly needed?
Programming and scripting, where timers and delays are often specified in seconds but planned in hours.
Why is an hour exactly 3,600 seconds?
It’s the product of 60 minutes per hour and 60 seconds per minute, a long-standing fixed relationship in timekeeping.
Can this handle fractional hours?
Yes — entering 1.5 hours converts to exactly 5,400 seconds, and any fractional value works the same way in both directions.
