Time Calculator
Add or subtract hours, minutes and seconds and find time between two clock times.
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About the Time Calculator
Time Calculator adds and subtracts durations in HH:MM:SS format and converts the result to total seconds, minutes and hours. It also finds the duration between two clock times, even across midnight.
How to use the Time Calculator
- Enter two durations and choose add or subtract.
- Or enter a start and end time to get the duration.
- Read the results.
Frequently asked questions
What format should I use?
Use HH:MM:SS or HH:MM, for example 1:45:30, or simply a number of seconds.
What if the end time is after midnight?
If the end time is earlier than the start time, the tool assumes it is on the next day.