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I've got a number in a spreadsheet like so: 28.686279

When I open this sheet in either LibreOffice Calc or Microsoft Excel, is there a formula function that returns the "whole number", I.e. 28. Also, is there a formula that returns the "decimal part", I.e. 0.686279?

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4 Answers 4

up vote 5 down vote accepted

TRUNC() is designed to remove the decimal part of any number immediately and without any modification to the non-decimal part.

So, as per LinYan's answer, you just need to use:

  • TRUNC(A1) to obtain the integer part of the value in A1
  • A1-TRUNC(A1) to obtain the fractional part of the value in A1

Unlike FLOOR(), TRUNC() works on both positive and negative numbers without requiring adjustment, and works in the same way in both Microsoft Excel and LibreOffice.

FLOOR() requires the significance parameter to have the same sign as the number being processed (or else will throw an error), so the 1 at the end would have to be changed to -1 to process negative numbers, or you could insert SIGN() and unnecessarily complicate the formula further.

And, in OpenOffice and LibreOffice, FLOOR() also has an additional (compared to Excel) third "mode" parameter that changes the results that the function returns for negative numbers.

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you can try FLOOR function, floor(A1,1) for integer part of A1, A1-floor(A1,1) for decimal part of A1.

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That works, thanks! –  hpy May 9 '11 at 3:59
    
Just wondering, why isn't there some form of FRAC(A1) function to retrieve the decimal part? It seems that's something people do quite often, right? –  Alexis Wilke Aug 29 '13 at 22:50

Don't think there's a specific function to do this, however by nesting a couple you can.

Assuming you're trying to return the right-of-decimal value for cell A1, the formula would be:

=MID(A1,SEARCH(".",A1,1)+1,LEN(A1))

Effectively what you're doing here is using the MID function to return some number of characters starting at the decimal point. All 3 references to A1 need to be updated for each cell you're targeting for it to work correctly.

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For example, imagine A1 is 167.583 :
int(A1) would give 167 and
mod(A1,1) would give 0.583 .

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