How to use time duration calculator
Add or subtract two durations written as hours, minutes and seconds. Display a signed result together with total seconds and decimal hours.
- Enter the numbers, dates or units you want to compare.
- Choose the calculation options and calculate.
- Review the result together with the assumptions shown.
Try this next
Add 01:35:20 and 00:45:50 to work out a combined session length.
A detail to keep in mind
These are durations rather than clock times. Hours can exceed 23, but minutes and seconds must be between 0 and 59.
Questions, answered.
Is time duration calculator free to use?
Yes. This tool is part of Nepocore’s free browser toolkit. There is no paid tier, file-download gate or application account required.
What should I check before using the result?
These are durations rather than clock times. Hours can exceed 23, but minutes and seconds must be between 0 and 59.
Does this tool upload my files or text?
The tool processes its input in your browser. File contents and text are not sent to a processing server. See the privacy page for local storage and hosting details.