2:45:30 + 1:20:45
4:06:15 — 4.1042 hours.
Time Calculator
Add or subtract hours, minutes and seconds, and convert the result to total hours, minutes or seconds.
Result
Enter your values and select Calculate to see the result.
Runs in your browser — nothing you enter is sent to a server.
How the Time Calculator works
Enter two durations in hours, minutes and seconds and choose whether to add or subtract them. The result is shown as hours:minutes:seconds and as a total number of hours, minutes and seconds. Values roll over automatically — 90 minutes counts as 1 hour 30 minutes — and a subtraction that goes below zero is shown with a minus sign.
Formula
s = h × 3600 + m × 60 + sec
Where:
- h
- Hours
- m
- Minutes
- sec
- Seconds
Both durations are converted to seconds, added or subtracted, then split back into hours, minutes and seconds.
Examples
1 hour 30 minutes 15 seconds in seconds
3,600 + 1,800 + 15 = 5,415 seconds.
Frequently asked questions
Can I use it for clock times, like 9:00 to 17:30?
Yes: subtract the start time from the end time using the 24-hour clock. 17:30 − 9:00 gives 8:30:00, or 8.5 hours.
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