Tool

Time Calculator

Add or subtract time values in hours, minutes, and seconds. Convert between time formats and calculate durations.

Using the Time Calculator

Adding and subtracting time can be difficult because of base-60 math (60 minutes per hour, 60 seconds per minute). This versatile time calculator handles the arithmetic for you, allowing you to easily add or subtract time units from any starting point.

How it Works

Enter your "Starting Time".

Select the operation (Add or Subtract).

Input the hours, minutes, and seconds you want to change.

Review the calculated "End Time" and the total duration in multiple formats.

Enter Time Values to Add