Duration Converter
Convert a total number of seconds into hours, minutes, and seconds, or the other way around. Free and private, right in your browser.
Seconds to hours, minutes, seconds
Hours, minutes, seconds to total seconds
Type in a number of seconds and instantly see it broken into hours, minutes, and seconds (and back again), handy for turning a video's runtime, an API timeout, a log timestamp, or a race split into something you can actually read at a glance.
How to use it
- Enter a total number of seconds (or hours/minutes/seconds instead)
- Watch the other fields update instantly
- Copy the hh:mm:ss result you need
Frequently asked questions
- Does it handle negative durations?
- Yes. Enter a negative number of seconds and the hours, minutes, and seconds all come out negative, so countdowns and time-remaining calculations stay correct.
- What happens with really large values, like millions of seconds?
- It converts fine, 31,536,000 seconds becomes exactly 8760 hours, 0 minutes, 0 seconds (one non-leap year), with no rounding until you get down to fractional seconds.
- Can I go the other way and enter hours/minutes/seconds to get total seconds?
- Yes, the fields are linked both ways. Type into any of the hour, minute, or second boxes and the total seconds value updates automatically.
- 1
Nothing is uploaded
The file never leaves your device. There is no server to send it to, so there is nothing to leak, log, or subpoena.
- 2
No signup, no limits
No account, no email, no daily cap, no watermark, and no paid tier waiting behind the third file.
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Works offline
Load the page once and it keeps working with the network off, because all the work was always happening locally.