Brian Dunning's FileMaker Custom Functions

IRR ( IRR1 ; IRR2 ; NPV1 ; NPV2 )

IRR - Calculate the IRR through 'Interpolation'

  Average rating: 3.8 (47 votes) Log in to vote

Barry Maskell   Barry Maskell
CB Richard Ellis
www.cbre.com.au

Share on Facebook Share on Twitter

  Sample input:
IRR ( 11 ; 12 ; 35167 ; 54790 )
  Sample output:
11.39

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

Where the IRR is required without the use of a spreadsheet or as a check method, the IRR for a project can be calculated through INTERPOLATION, through simple linear interpolation. This involves finding the IRR of two trials where the NPV is either side of zero. Then by using the interpolation formula, the IRR can be found.

Eg: IRR1 = 11%
IRR2 = 12%
NPV1 = $35,167
NPV2 = $54,790
RESULT IRR : 11.36%
*/

 

Comments

Log in to post comments.

 

Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

Under construction. Email me your wish list for improvements.