Fat Content Calculator Formula
Understand the math behind the fat content calculator. Each variable explained with a worked example.
Formulas Used
Total Fat
fat_g = food_weight_g * fat_pct / 100Calories 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 * 100Variables
| Variable | Description | Default |
|---|---|---|
food_weight_g | Food Weight(g) | 100 |
fat_pct | Fat Content | 15 |
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.
- 01Fat content: 15% (85% lean = 15% fat).
- 02Fat: 100 x 15/100 = 15 g.
- 03Calories from fat: 15 x 9 = 135 kcal.
Frequently Asked Questions
What types of fat are there?
Saturated (solid at room temperature), monounsaturated (olive oil), polyunsaturated (fish oil, flax), and trans fats (partially hydrogenated oils). Unsaturated fats are generally healthier.
How much fat per day?
The USDA recommends 20-35% of daily calories from fat. On a 2000 kcal diet, that is 44-78 g of fat per day.
Does cooking add fat?
Frying adds fat from the cooking oil. Grilling and baking can reduce fat as it drips away. The cooking method significantly affects total fat content.
Ready to run the numbers?
Open Fat Content Calculator