Fat Content Calculator Formula

Understand the math behind the fat content calculator. Each variable explained with a worked example.

Use the Fat Content Calculator

Formulas Used

Total Fat

fat_g = food_weight_g * fat_pct / 100

Calories from Fat

cal_from_fat = (food_weight_g * fat_pct / 100) * 9

% of 65 g Daily Value

pct_daily_65g = (food_weight_g * fat_pct / 100) / 65 * 100

Variables

VariableDescriptionDefault
food_weight_gFood Weight(g)100
fat_pctFat Content15

How It Works

How to Calculate Fat Content

Formula

Fat (g) = Food Weight (g) x Fat Percentage / 100

Calories from Fat = Fat (g) x 9

Fat provides 9 calories per gram, more than double protein or carbs (4 cal/g each).

Daily Value

The daily value for total fat is 65 g based on a 2000 calorie diet (about 30% of calories from fat).

Worked Example

Calculate fat in 100 g of 85% lean ground beef.

food_weight_g = 100fat_pct = 15
  1. 01Fat content: 15% (85% lean = 15% fat).
  2. 02Fat: 100 x 15/100 = 15 g.
  3. 03Calories from fat: 15 x 9 = 135 kcal.

Ready to run the numbers?

Open Fat Content Calculator