Free Time Duration Calculator

Use the My Hours Time Duration Calculator to accurately calculate the difference between two times in hours, minutes, or seconds.

Accurately calculating time between two times means finding out the exact number of hours, minutes, and seconds between them. To do that, you should:

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1. Choose the start and end time.

You’ll need to subtract the start time from the end time using a particular formula (more on that below).

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2. Your start and end time need to be converted to a 24-hour format (i.e. military time).

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Any time in the AM will be in the 24-hour format, but for PM time, you’ll need to add 12 to the hours to convert it to military time. 

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For instance, if you want to convert 3:00 PM from a 12-hour to a 24-hour format, it would look something like this:

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3 + 12 = 15  

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3. Work out if the minutes are larger in the start or end time. 

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If the minutes are larger in the start time, subtract the start time from the end time. To make it easier, you can separate the hours from minutes and calculate them individually. For example:

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15:57 - 8:45 = 15 - 8 and 57 - 45 = 7:12

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If the minutes are larger in the end time, add 60 to the start time minutes and subtract 1 from the start time hours, then perform simple subtraction. When you do that, your calculation will look something like this:

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15:57 - 8:59 = 14 (15 - 1) : 117 (57 + 60) - 8:59 = 6:58