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Time Duration Calculator

Calculate the duration between two times in hours, minutes and seconds, or add and subtract times. Handles times past midnight. Free.

First time
Second time
Result
4 h 15 min
In decimal hours
4.25
In minutes
255
In seconds
15,300

How long between two times?

Enter a start and an end time to get the duration in hours, minutes and seconds. From 9:15 to 17:45 is 8 hours 30 minutes. If the end is earlier than the start, the calculator assumes it's the next day, so 22:00 to 06:00 is 8 hours. You can also add or subtract durations, such as 2 h 45 min + 1 h 30 min = 4 h 15 min, for adding up shifts or lap times.

How to use it

  1. 1

    Choose the calculation

    Duration between times, or add and subtract durations.

  2. 2

    Enter the times

    In hours and minutes, with seconds if needed.

  3. 3

    Read the duration

    In hours and minutes, total minutes and decimal hours.

Frequently asked questions

How do I calculate time between two times?

Subtract the start from the end. If the result is negative, add 24 hours.

How do I write 8 hours 30 minutes as a decimal?

8.5 hours. Divide the minutes by 60 and add them to the hours.

Can I add durations together?

Yes. Use the add tab to add or subtract hours, minutes and seconds.

Is anything stored?

No. The calculation runs in your browser.

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