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May 26th, 2010, 08:09 AM  #1 
Newbie Joined: May 2010 Posts: 2 Thanks: 0  Calculating positive percentage change
Hi there, I am trying to calculate the positive change between monthly values. Lets say I have the following values: Month 1) 25,300 Month 2) 18,900 Month 3) 8,200 Month 4) 1,300 Month 5) 1,100 Month 6) 4,200 I want to see what the change is every month as a positive percentage. For the positive numbers, I can calculate say for month 6, the difference was (month6month5)/month5. Is there a formula to always give me a positive change regardless of whether the inputs are negative or positive? 
May 26th, 2010, 01:42 PM  #2 
Member Joined: Apr 2010 Posts: 34 Thanks: 0  Re: Calculating positive percentage change
I think if you have a number of months m1, m2, m3......m(n).... to find the positive percent gain from some month m(n) to the next month m(n+1), I thnk the equation is [m(n+1)  m(n)] / m(n). Notice that the denominator is in absoulte value brackets. This way, it doesn't matter if any of the terms are negative...you will always get a positive result as long as money keeps going up every month. 
May 27th, 2010, 06:10 AM  #3 
Newbie Joined: May 2010 Posts: 2 Thanks: 0  Re: Calculating positive percentage change
Great that looks like it did the trick. http://www.purplemath.com/modules/absolute.htm 
January 30th, 2017, 07:27 AM  #4 
Newbie Joined: Jan 2017 From: london Posts: 1 Thanks: 0 
You can check it at www.percentagechangecalculator.com.

February 9th, 2017, 06:14 AM  #5 
Math Team Joined: Jan 2015 From: Alabama Posts: 3,264 Thanks: 902 
The "percentage change" is always the amount of change divided by the absolute value of the original amount. Here, on the first month, the amount was 25300. On month 2, the amount was 18900, an increase of 18900 (25300)= 6400. so the percentage increase is 25.3%.


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