“How I wish time was decimalised”

Nancy (2007)

Changing Excel hh:mm Time Into Decimal Hours


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 A2 contains the time in hours and minutes (eg 7:30), then this formula is one way to turn that time into its decimal equivalent in hours (ie 7.5):


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 B has been formatted to three decimal places to illustrate the cut off at two caused by the ROUND:

Changing hh:mm into decimal hours

One of our Technical Notes has a full discussion on rounding.


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