Joined: 25 Sep 2007
|Posted: Wed Apr 29, 2009 4:54 pm Post subject: How to calculate percent error
|Let us say, you want to calculate the percent error of your measurements (the height of the tree next to your window or anything else).
You measured the height to 23.6 m whereas the original height is 25 m. So what’s your percent error?
Formula for percent error = (measured value – real value)/real value * 100
So let’s calculate your percent error:
(23.6 – 25)/25 * 100 = - 5.6%
A ‘-‘ sign means that your measured value is lower than the true value.
If you would have measured the height to 26.7 m whereas the real value stands the same to 25 m, then your percent error is
(26.7 – 25)/25 * 100 = 6.8%
A positive value means that your measurement is higher than the true value.
You did a lot of calculation. Now relax .
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