How do I add two times together?

Enter each duration in hours, minutes, and seconds, then add them. The calculator carries seconds into minutes and minutes into hours automatically.

How do I convert a duration to decimal hours?

Divide total minutes by 60 and add to whole hours. For example, 2 hours 30 minutes equals 2.5 decimal hours. The calculator shows this conversion for you.

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Date & Time

Time Calculator

Add or subtract two durations in hours, minutes, and seconds. The total is also shown in decimal hours, total minutes, and total seconds.

Result

4:16:15

Decimal hours—

Total minutes—

Total seconds—

How it works

Each duration is converted to total seconds, combined, and then converted back to hours, minutes, and seconds. Because there are 60 seconds in a minute and 60 minutes in an hour, any overflow carries up cleanly.

total seconds = h×3600 + m×60 + s
decimal hours = total seconds ÷ 3600

Worked example

2:45:30 plus 1:30:45 is 9,930 + 5,445 = 15,375 seconds, which is 4 hours, 16 minutes, and 15 seconds — or 4.27 decimal hours.

Frequently asked questions

How do I add two times?

Enter both durations and add — seconds carry into minutes and minutes into hours automatically.

How do I get decimal hours?

Divide total minutes by 60 and add whole hours. 2h 30m = 2.5 decimal hours; the calculator shows it for you.