# Math Question: Ex. Percentage Change from Month to Month

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• #55657

68rs327
Participant

I am calculating the percentage increase or decrease from January’s OEE to February’s OEE.

Example: January’s OEE was 64% and February’s OEE was 74% what percentage increase did OEE improve. I used the formula below, let me know your thoughts on if this is the correct way to calculate OEE % increase or decrease.
I come up with a 15.62% improvement in February vs. January.

To find the percent change between two percentages:

Start by using the following difference quotient

(new number – current number) / current number

2. Then multiply the result in step (1.) by 100%.

Example:

64% to 74%

74-64=10

10/64=.1562

.1562*100= 15.62%

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#201004

68rs327
Guest

Any Math guys here?

0
#201005

MBBinWI
Participant

@68rs327 – this is rather simple. Why are you looking for confirmation?

0
#201006

68rs327
Guest

Someone at work told me it was wrong… I’d like another opinion.

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#201009

MBBinWI
Participant

@68rs327 – other than incorrect rounding, this is the correct answer. Your colleague is probably mixing up percentage points improved (which would be 10) with percent improved, which as you indicate is (0.74/0.64)-1, which calculates out to 15.625 (or 15.63 rounded).

You and your coworker should talk about clear definitions of terms, as the two of you are not in agreement. Perhaps you both will learn something. At the very least, you will be communicating more precisely.

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