Duration Calculator
Add time durations or subtract two durations and convert the result to seconds and decimal hours.
Result
How to use
Enter one H:MM:SS or M:SS duration per line.
Run the tool to calculate or transform the input.
Copy the result or save it as a text file.
FAQ
What rules does this tool use?
All durations are converted to seconds first, so totals may exceed 24 hours.
What are the limits?
This is elapsed time, not clock time. Use exactly two lines for subtraction.
Are my inputs uploaded?
Tool inputs are processed in your browser. Advertising makes separate requests as described in the privacy policy.