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Date & Time
Time Duration Calculator
A duration is simply the difference between two moments, but crossing midnight or an hour boundary makes it easy to get wrong by hand. This calculator handles the wrap-around automatically.
How it works
Start time (HH:MM)
End time (HH:MM)
Hours
Minutes
Seconds
Duration
Share of a 24-hour day
Frequently asked questions
How do I use the Time Duration Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.