Enter the total number of grams of fat into the calculator to determine the number of calories in that fat.

Grams of Fat to Calories Formula

The following formula is used to calculate the total number of calories contained in a specific weight of fat.

C = GF * 9 
  • Where C is the number of calories
  • GF is the number of grams of fat

To calculate the number of calories in fat, multiply the grams of fat by 9.

How many calories are in fats, carbs, and protein?

Fats contain the most amount of energy per unit weight (grams). Fats come in at 9 calories per gram, while carbs and protein both come in at 4 calories per gram.

One of the big reasons that excessively high-fat diets are extremely bad for health is because these diets often are really high in calories.

While there can be other reasons, the fats themselves are usually too unhealthy for a person if they are the right fats, but they are high in calories, so if you overeat, you will gain weight and suffer health consequences.

How to calculate calories from fat?

The following example outlines how to calculate the total amount of calories in fat.

First, determine the total amount of fat is in the portion. For this example problem, there are 50 grams of fat.

The next, and last step is to simply use the formula above to calculate the number of calories in the fat.

C = GF * 9

C = 50 * 9

C = 450 calories