Time Addition Calculator

How to Add Multiple Time Durations

This calculator sums multiple time entries (hours, minutes, seconds) into a single total duration.

Step-by-step

  1. Enter each time duration on a separate line in H:MM:SS format.
  2. Click Calculate to get the total time.

Worked example

Enter three durations: 1:30:00, 0:45:30, 2:15:00. Total = 4 hours 30 minutes 30 seconds → 4:30:30.

When to use

Adding up work hours across multiple days, totaling lap times for a race, summing audio track lengths for a playlist, and logging billable hours across tasks.