How duration calculator works
Total seconds = hours × 3600 + minutes × 60 + seconds.
Try an example
2 hours 30 minutes → 9,000 seconds.
Good to know
This is elapsed duration arithmetic, independent of timezone. Fractional inputs are allowed.
Your privacy
Processing happens on this device. We do not upload your input, put it in share links or save it to your favourites. Closing this tab discards the working input; downloaded results remain wherever you save them.