Time calculator
Add and subtract hours and minutes
How it works
Add durations in HH:MM or HH:MM:SS format, separated by whitespace. Prefix a duration with minus to subtract it. Totals can exceed 24 hours.
Example
08:30 + 01:45 − 00:20 = 09:55.
How to use
- Enter your values or choose a local file.
- Choose settings and run the tool.
- Review the result, then copy it or download the file.
Common questions
What rules does this tool use?
Add durations in HH:MM or HH:MM:SS format, separated by whitespace. Prefix a duration with minus to subtract it. Totals can exceed 24 hours.
Are my inputs uploaded?
Calculations, texts and files are processed in this browser. The currency tool requests only currency codes from our server.
Free tool · Inputs processed locally · Updated October 5, 2026