Microsoft KB Archive/214096

= Method to calculate interpolation step value in Excel =

Article ID: 214096

Article Last Modified on 2/23/2007

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APPLIES TO


 * Microsoft Office Excel 2007
 * Microsoft Office Excel 2003
 * Microsoft Excel 2002 Standard Edition
 * Microsoft Excel 2000 Standard Edition

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This article was previously published under Q214096





SUMMARY
The following Microsoft Excel formula performs linear interpolation by calculating the interpolation step value

=(end-start)/(ROW(end)-ROW(start))

where  is the cell address of the larger number, and   is the cell address of the smaller number.

Interpolation is a method used to determine a present or future value factor when the exact factor does not appear in either a present or future value table. Interpolation assumes that the change between two values is linear and that the margin of error is insignificant.



MORE INFORMATION
To create a sample linear interpolation formula, follow these steps:   Type the following values in a worksheet:   A1: 9          B1: =(A7-A1)/(ROW(A7)-ROW(A1)) A2: =A1+$B$1 A3: A4: A5: A6: A7: 11   Select cells A2:A6. On the Edit menu, point to Fill, and then click Down. The formula is filled down, and the following values are displayed in cells A2:A6:   A2: 9.33333 A3: 9.66667 A4: 10. A5: 10.33333 A6: 10.66667 

NOTE: You must type the reference to the step value in cell B1 as an absolute reference (with dollar signs).

Additional query words: interpolate xl20 xl2000 xl2k XL2003 XL2002 XL2007

Keywords: kbhowto kbinfo KB214096

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