# Percent error?

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What is the formula for percent-error? It's either:

or

I'm pretty sure it's the first one, but I also heard it can go either way. I tried both ways but I end up with two different values. Which one is which?

• Percent error? -

Neither.
%error = [delta/accepted value]*100
delta = your value - accepted value

• Percent error? -

Oh yeah. I was trying to remember it but I just couldn't get it straight. Thanks!

• Percent error? -

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