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How to use Pearson’s Square

Hi, Milk Scientists

Need to know how much milk to mix with another to get a certain butterfat %?

Use the Pearson Square or the “milk butterfat square”.  Subtract diagonally and convert to the positive if not. Mix the parts as calculated and you will get the center value ( the one you wanted ).

In this example 2/3 of the final volume of the 4% milk must be added to 1/3 of the 1% milk to get 3% milk. So if you wanted 1000 L of 3% milk, then you would need 666 L of 4% milk and add that to 333 L of 1% milk.

This also works well for juices with different concentrations (Brix).

Kind regards,

Leon the Milkman


Dairy Science and Technology, Second Edition (Food Science and Technology)

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