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In the equation:

$5 \times 100 / 1$

You see that $5$ over $1$ is a $500\%$ increase. How would I show the percent of increase over zero? Thank you.

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    I would say 5 over 1 is a 400% increase. Certainly 1 over 1 is no increase at all.2012-10-30

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$500$% increase means that provided that you previously had $x$ amount of something, then it became $5$ times itself.

$500$% increase 'over $0$' thus means that you had $x=0$, and finally it became $5x$ which is still $0$.

Increase from $0$, hence is not measured well by the ratio of increasement, but the increasement itself. And, percentage can describe only ratios.

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    Question, and this is me speaking as a German, thus not 100% familiar with the English language: Wouldn't a 500% increase mean something goes from 1 -> 6? It's increased by 5, which is 500% of the original value. I would understand if someone says "we performed 5 times better", but increased by 4 times.2012-11-20