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Jeremy-M asked on

Excel 201 Convert minutes & seconds to decimals

How can I convert minutes and seconds to decimals, for example, 21:42 (21 minutes:4 seconds is .3671 of an hour.  What is the formula and what is the cell formatting to convert minutes:seconds to decimals?


Microsoft Excel

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Steven Carnahan

8/22/2022 - Mon
Saqib Husain

Divide the time by 2.5    and format the cell as general or fixed,


What is the cell format for 21:42?

What is the cell format for the formula?
Saqib Husain

21:42 can be either in time format or in text format
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William Peck
Steven Carnahan

If you use the time format then you should put it in 00:21:42 format or it will read as hours/minutes instead of minutes/seconds.
Saqib Husain

Thank you pony10us for correcting me. my formula was converting 21hrs... to decimals.

Actually you should be dividing the time by 24.

I formatted the cell as "hh:mm:ss" and the Error Message displayed below appeared when I depress the tab key and attempted to exit the cell.

Error Message for "hh:mm:ss" Cell Format
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Saqib Husain

Can you include the formula bar and the cell in the snapshot?
Steven Carnahan

np - however I think it would be to multiply by 24

00:24:15 * 24 = 0.404167
24:15:00 * 24 = 24.25   (24 and 1/4 hours)
23:15:00 * 24 = 23.25   (23 and 1/4 hours)
23:45:00 * 24 = 23.75   (23 and 3/4 hours)

Actual formula would be:

=a1*24  (a1 being the cell that contains the time)

I'm still getting the error message

I can't upload an image large enough to be readable

Cell Format:          Custom "hh:mm:ss"

Entering "00:21:42: in the cell results in the standard Excel Error Message

"The formula you type contains an error:
blah, blah, blah"

What is wrong?

Cell Format - Cell Contents - Error Message
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James Murphy
Steven Carnahan

Column A is format time hh:mm:ss
Column D is format general
Formula is in column D as shown at top of screen cap

time decimal conversion

The format I am using in Column A is "hh:mm:ss" and when I enter "00:21:42" or "0:21:42" I receive the error message when I depress the tan key in an attempt to exit the cell the Excel error message is displayed.

This should not be this difficult!
Steven Carnahan

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