Time Calculator

Add or subtract hours, minutes and seconds — useful for totalling work hours, cooking times or scheduling.

First time

Hours

Minutes

Seconds

Operation

Second time

Hours

Minutes

Seconds

Result

4h 15m 0s

How to use the Time Calculator

Enter the first time value in hours, minutes and seconds.

Choose add or subtract, then enter the second time value.

The calculator shows the correctly carried-over result.

What happens if I subtract a larger time from a smaller one?+

The calculator shows the result as a negative duration, clearly labelled, rather than an invalid or confusing value.

Can I use this to total up work hours for a week?+

Yes — add each day's hours one pair at a time, using the running total as the next 'first time' value.