Atwater factors calculator

1. What is the Atwater equation?
2. How does the Atwater system work?
3. What is the Atwater factor for fat?
4. What are the Atwater general factors?

What is the Atwater equation?

Calculated with modified Atwater equation (AAFCO, 1997): ME (kcal/kg) = 10 × (3.5 × Crude Protein % + 8.5 × Crude Fat % + 3.5 × Nitrogen-Free Extract %).

How does the Atwater system work?

The Atwater system uses the average values of 4 Kcal/g for protein, 4 Kcal/g for carbohydrate, and 9 Kcal/g for fat. Alcohol is calculated at 7 Kcal/g. (These numbers were originally determined by burning and then averaging.)

What is the Atwater factor for fat?

In the case of fat, the Atwater general factor of 37 kJ/g (9.0 kcal/g) is commonly used. Specific factors range from 35 kJ/g (8.37 kcal/g) to 37.7 kJ/g (9.02 kcal/g), a range of -5 to +2 percent relative to the general factor.

What are the Atwater general factors?

The Atwater general factor system includes energy values of 4 kcal per gram (kcal/g) (17 kJ/g) for protein, 4 kcal/g for carbohydrates and 9 kcal/g (37 kJ/g) for fat. Alcohol is also technically considered a macronutrient and contains 7 kcal/g (29 kJ/g).