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The term percent change is commonly used to describe $\frac{new - old}{old}\times 100$ which is the fraction of the old value by which it has grown. There is a related concept which is $\frac{new - old}{new}\times 100$ which is the fraction of the new value which is attributed to the change. Is there a common term for this?

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2 Answers

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Answer

Percentage change = $\frac{new - old}{old}\times 100$

From my experience and research, there is not a common term for: $\frac{new - old}{new}\times 100$.

Claim

That being said, I'd like to stake my claim and coin the corresponding term. It is to be known thus, as percentage change with respect to the new value.

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This is commonly called the relative change, which may (but need not) be expressed as a percentage. The difference new - old is the absolute change.

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