Time Duration Calculator
Add, subtract and convert hours, minutes and seconds.
Enter your values
ⓘ Live results
Results
- Result
- 4:05:45
- Decimal hours
- 4.0958
- Total minutes
- 245.75
- Total seconds
- 14,745
Quick answer
Convert both durations to seconds, add or subtract, then convert back to hours, minutes and seconds.
How to use the Time Duration Calculator
- 1Enter the first duration as HH:MM:SS.
- 2Enter the second duration.
- 3Choose add or subtract.
Worked example
Using the values the calculator loads with:
Inputs
- First duration02:45:30 HH:MM:SS
- Second duration01:20:15 HH:MM:SS
- OperationAdd
Results
- Result4:05:45
- Decimal hours4.0958
- Total minutes245.75
- Total seconds14,745
Frequently asked questions
Why is 1:30 not 1.30 hours?
Minutes are sixtieths, so 1:30 is 1.5 decimal hours. Payroll and billing always use the decimal form.
Can I enter durations over 24 hours?
Yes — the hours field is not capped, so 36:00:00 is valid.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.