Time calculator

Add several durations or subtract everything after the first row from the first duration.

0 seconds

How it works

Each row becomes milliseconds. Addition sums them. Subtraction combines every row after the first, then subtracts that total from the first. Negative results are labeled rather than wrapped.

Questions

Can hours go past 24?

Yes. This tool adds durations, not clock times. 20 hours + 6 hours is 26 hours.

Example?

2 hours 30 minutes + 1 hour 45 minutes = 4 hours 15 minutes.

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