Ed= ? Formula

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donf

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Please forgive this rudimentary question, but I need to get a good freeware voltage drop calculator or a corrected formula

I have been using the following formula:

%Ed=k*I*D*C/CMA where:
K = 12 for copper or 10 for Aluminum
I = Load
D = Distance
C = Number of Conductor
CMA = Area of cable

%Ed=12*60*90*2/26240
%of Ed 4.9 240* 4.9% = 12 Ed = 240-12 = 228 VAC

I cannot seem to get the percentage correct, what am I doing wrong?
 
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