After computing the decimal value simply converts eh decimal number computed into a percentage by multiplying it by 100. Displaystyle text MPE frac 100 nsum _ t1 n frac a_ t-f_ t a_ t where at is the actual value of the quantity being forecast ft is the forecast and n is the number of different times for which the variable is forecast. The formula to calculate Percent Error is.
Normally the absolute value of the error is divided by an accepted value and given as a percent.
Displaystyle text MPE frac 100 nsum _ t1 n frac a_ t-f_ t a_ t where at is the actual value of the quantity being forecast ft is the forecast and n is the number of different times for which the variable is forecast. Percentage of Days spent in USA 5 15 100 3333 Percentage of Days spent in Home Town 10 15 100 6666. Absolute Difference Accepted value Experimental value Percentage Error fracAbsolute Difference Accepted Valuetimes 100. Percentage Error Approximate Value Exact Value Exact Value 100.