Time Calculator: Add and Subtract Hours, Minutes and Seconds
Enter two durations and choose add or subtract. The result is shown as h:mm:ss, as days, hours, minutes and seconds, and as totals.
Estimates only. Check important results before you rely on them.
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From related categoriesHow to use this calculator
- Choose Add or Subtract.
- Enter the first duration in hours, minutes and seconds.
- Enter the second duration.
- Read the total at the top and the other forms below it.
The formula
Worked example
14:45:30 + 11:30:00 = 26:15:30, which is 1 day, 2 hours, 15 minutes and 30 seconds, or about 26.2583 hours.
Understanding your result
A negative result means the second duration is longer than the first. Minutes and seconds above 59 are fine, they are carried over automatically.
When to use it
- Add up work hours, shifts and timesheets.
- Total video or audio running times.
- Find the time left between two durations.
Assumptions and limits
This tool works with durations, not clock times on a 12 or 24-hour dial. Use the Date Difference Calculator for dates.
Frequently asked questions
How do I add hours and minutes?
Convert both to minutes or seconds, add them, then convert back. The calculator does this automatically.
What does a negative result mean?
You subtracted a longer duration from a shorter one.
Can minutes go above 59?
Yes. 90 minutes is treated as 1 hour 30 minutes.
How do I convert the result to decimal hours?
See the Total hours line, which is seconds divided by 3600.
Can I add more than two durations?
Add two, then use the result as the first duration for the next.