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Changing Excel hh:mm Time
Into Decimal Hours

Last updated on 2018-08-01 by David Wallis.


‘How do I convert a time (like 7:30, seven hours thirty minutes) into a number (ie 7.5) that I can use in an Excel calculation of total hours?”


If cell B2 contains the time in hours and minutes, for example 7:30, then this formula is one way to turn that time into its decimal equivalent in hours, that is 7.50:


The inclusion of the ROUND() function limits the calculation of the time to two decimal places in this example, ie 7.50.

In this illustration Column C has been formatted to two decimal places to correspond to the two places assigned to the ROUND() function via its second argument:

Excel Time Conversion

Note the application of the [h]:mm custom number format to the times in Column B. If you don't apply that format you might get some funny results. Excel Formuale and Formats for Time Differences carries an explanation of how Excel manages times greater than 24 hours.

Rounding Numbers Rumination has a full discussion on rounding in Excel, Access and VBA.

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“How I wish time was decimalised.”

Nancy (2007)