How it works
Both durations are converted to minutes before addition or subtraction, then converted back to hours and minutes.
Durations and schedules
Duration Add or Subtract Calculator
Enter durations as HH:MM, including values longer than 24 hours.
Your result4 hr 15 min
Result of the operation on both durations.
- Signed minutes
- 255
Understanding your result
A negative result means the second duration is greater than the first during subtraction.
Last verified:
03FAQ
Frequently asked questions
Yes. These are durations, not clock times.