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Lynn Curtis

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Dry Matter Basis Calculation

Dry Matter Basis removes the water from the equation. When foods are considered on a dry matter basis, they can be directly compared to one another. In other words, a canned food with 78% water can now be compared to a dry food that contains 11% water.

Using the following equation, plug in the Guaranteed Analysis Values or the As Fed (Served) Values, but remain consistent, do not use one of each.

At first glance, it appears that the dry food below has more protein than the canned food. However, the canned food on a dry matter basis contains 45% protein as opposed to the dry food which contains 40% protein, when calculated.

Dry Food
Canned Food

Protein

36%

Protein

10%

Fat

18%

Fat

5%

Moisture

11%

Moisture

78%

Calculating the DMB (Dry Matter Basis):

Dry Food Protein = 36%
Dry Food Moisture = 11%
100% (dry and wet) – 11% (wet) = 89% dry
(36% Protein / 89% dry) x 100 = 40% Protein DMB in dry food

Canned Food Protein = 10%
Canned Food Moisture = 78%
100% (dry and wet) – 78% (wet) = 22% dry
(10% Protein / 22% dry) x 100 = 45% Protein DMB in canned food