
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
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February 5th, 2015, 04:52 PM  #1 
Member Joined: Oct 2014 From: Mars Posts: 37 Thanks: 0  Reverse compound interest excel formula?
Hi, is there a way to find out the annual compound interest (A), from the interest (I) over (Y) number of years? For example: If interest over 5 years is 300%, so I=5, Y=3.0, how can I calculate A=? Thanks in advance. 
February 5th, 2015, 05:17 PM  #2 
Math Team Joined: Dec 2013 From: Colombia Posts: 7,671 Thanks: 2651 Math Focus: Mainly analysis and algebra 
Libre Office has a NOMINAL function. In your case $$A = \text{NOMINAL}(Y,I)$$

February 5th, 2015, 07:27 PM  #3 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038 
Well, if your weird(!) example means an initial deposit of 1 dollar accumulates to 4 dollars (300%) over 5 years, then it's this simple: 1(1 + i)^5 = 4 1 + i = 4^(1/5) i = 4^(1/5)  1 = .3195079... or ~31.95% cpd annually. 
February 6th, 2015, 12:48 AM  #4 
Member Joined: Oct 2014 From: Mars Posts: 37 Thanks: 0 
Thanks Denis! Works great! 

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compound, excel, formula, interest, reverse 
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