Seconds Converter
Type a raw number of seconds — 3725, 86,400, whatever a log file, API response or stopwatch hands you — and see it as readable hours, minutes and seconds. Go the other way too: type 1:02:05 and get the total seconds, which is what video timestamps and countdowns actually expect.
It is a small tool with an outsized number of uses: run splits (a marathon in seconds), podcast chapters, benchmark timings, game speedruns, and every timestamp that was clearly never meant for human eyes.
How to use
- Type a number of seconds — the h:m:s breakdown appears instantly.
- Or type a duration like 1:02:05 in the second box to get total seconds.
- Both boxes stay in sync — edit either side at any time.
Frequently asked questions
How many seconds are in an hour?
3,600 — 60 seconds × 60 minutes. A day is 86,400 seconds, which is the number behind most computer clock internals.
How do I convert seconds to h:mm:ss?
Divide by 3,600 for hours, take the remainder and divide by 60 for minutes, and what is left is seconds. 7,325 seconds = 2:02:05. The converter does this and shows the padding.
How many seconds is a 4 minute mile?
A 4-minute mile is 240 seconds — or 0.066 hours. Elite marathoners cover the same distance in under 4:35 per mile for two hours straight.
Why do APIs return seconds instead of hh:mm:ss?
Because plain integer seconds are unambiguous, sortable and easy to add — no 60-based carrying. Humans get readability; machines get seconds, and this converter translates between them.