How time durations are combined
Durations are normalized into total minutes. In addition mode, the minutes are summed and converted into whole hours and remaining minutes.
In subtraction mode, the second duration is subtracted from the first duration to find the residual time.
Worked example
Adding 2 hours 45 minutes and 3 hours 30 minutes:
The combined duration is 6 hours and 15 minutes, which equates to 6.25 decimal hours, 375 total minutes or 22,500 seconds.
Inputs for the time addition calculator
First duration - hours
The hours portion of your first duration.
First duration - minutes
The minutes portion of your first duration (0 to 59).
Mathematical operation
Select whether to add or subtract the second time interval.
Second duration - hours
The hours portion of the second duration.
Second duration - minutes
The minutes portion of the second duration (0 to 59).
CALCULATOR QUESTIONS
Time addition calculator questions
Can I add more than 24 hours?
Yes, you can enter up to 9,999 hours to aggregate weekly or monthly task timesheets.
What happens if subtraction yields a negative result?
The calculator clamps the minimum duration at zero minutes to prevent negative elapsed time.