Formula to calculate the amount of fat to add to get a certain percent fat in the sausage.

Fat to Add Calculator
F2A = MoH/[(1 – F%D)/F%D]

F2A = Fat to Add
MoH = Meat on Hand
F%D = Fat % Desired

Example: 10 lbs of meat how much fat do I add?
F2A = 10/(1 – 0.3)/0.3 = 4.29 lbs of Fat to Add 4.29/14.29 = .30
Meat to Add Calculator
M2A = FoH X (1 – F%D)/F%D

M2A = Meat to Add
FoH = Fat on Hand
F%D = Fat % Desired

Example: 4.29 lbs of fat how much meat do I add?
M2A = 4.29 X (1 – 0.3)/0.3 = 10 lbs of Meat to Add
Again, this is more of my scratch pad, but hopefully, someone else might find it of use. I used 30% because that’s what Jimmy Dean uses in his sausage. If I wanted 14% (1.63 lbs) for my hamburger then I use that as my F%D.

By the son of mtnlakeman at SMF.

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From: http://www.madmeatgenius.com/search/label/Sausage

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