How to Calculate Percent Error

Place a known weight on the scale and record the weight displayed on the scale.

Use the known weight and the weight observed on the scale in the formula below.

[ [ (Observed Weight) / (Known Weight) ] x 100] - 100 =  % Error

Example:

                        A known weight of 1,380 lbs is placed on the scale. The scale shows 1,200 lbs.

[ [ (1200) / (1380) ] x 100] - 100 = %Error

      1200/1380=0.8696

[ [0.8696] x 100] - 100 = %Error

      0.8696 x 100 = 86.96

[86.96] - 100 = %Error

      86.96 - 100 = -13.0

-13.0 = %Error

The percent error is -13%, this means the scale is reading 13% low.

If the percent error is more than 1% off, recalibration is recommended.

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