Calculating accuracy within excel -


i have prediction cell (a1), results cell (b1) , difference cell (c1) in excel.

i have accuracy cell (d1) show accuracy of prediction based on result. example, if have 24 prediction , 24 results, accuracy should 100% difference of 0. if have prediction of 24 , results 12, accuracy should -50% difference of -12.

here calculation i'm using in accuracy cell (d1):

=(((c1+100)*a1)/b1)/(c1+100)

this calculation showing expected results when prediction cell higher or equal results cell. assistance appreciated, thank you.

format cell in col c "%" , try formula

formula in c1 per snapshot

=if(b1<a1,value("-"&(b1/a1)),(b1/a1))

formula in d1 per snapshot

=b1-a1

various test scenarios below.

enter image description here

let me know if have misunderstood question , rectify answer.

followup

try new formula

=if(b1<a1,value("-"&(b1/a1)),if(b1=a1,b1/a1,(b1-a1)/a1))

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