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Time Duration Calculator

Find elapsed hours and minutes between two times on a 24-hour clock.

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Adjust the values below to get a clear estimate.

FREE TOOL

Clock-minute subtraction

Convert each time to minutes after midnight. If the end is earlier than the start, add 1,440 minutes to represent the next calendar day.

Duration = end minutes − start minutes; add 1,440 if negative

Worked example

An evening-to-morning interval

Inputs: start: 22:30 · end: 06:15

Illustrative result: 7 hr 45 min

The end clock time is earlier, so it is interpreted as the next morning.

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Good to know

Frequently asked questions

Does 08:00 to 08:00 mean one day?

This calculator treats equal times as zero elapsed minutes, not a full 24-hour interval.

Does it handle daylight-saving time?

No. Entered values are clock times without a date or time-zone transition.