My Math Forum Calculating positive percentage change

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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 (month6-month5)/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. $\frac{6400}{25300}= 0.253$ so the percentage increase is 25.3%.

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