Fat Intake Calculator
Estimate your daily dietary fat intake in grams from your calorie target and the percentage of calories you want from fat.
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- Accurate results
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- Works on all devices
Your result
56 g/day
Fat
AI explanation
Formula
Fat grams = calories × percent / 100 / 9Worked example
2000 kcal at 25% from fat
| Field | Value |
|---|---|
| Daily calorie target | 2000 |
| Percent of calories from fat | 25 |
| Fat | 56 |
Assumptions
- Uses the Atwater factor of 9 kcal per gram of fat.
- A common general guideline is 20-35% of calories from fat, though individual needs vary with activity level and dietary approach.
- Informational only — not personalized medical or dietary advice.
Frequently asked questions
How much fat should I eat per day?
General dietary guidelines suggest 20-35% of total calories from fat, prioritizing unsaturated sources (nuts, seeds, olive oil, fish) over saturated and trans fats.
Why does fat use 9 kcal/g instead of 4?
Fat is more energy-dense than protein or carbohydrate — this is the Atwater energy factor, reflecting how many calories a gram of fat actually yields when metabolized.
Is a low-fat diet healthier?
Not necessarily — dietary fat is essential for hormone production and absorbing fat-soluble vitamins. Diet quality within the fat you eat (unsaturated vs. saturated/trans) matters more than minimizing total fat.
Related calculators
Sources
- Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids — National Academies (Institute of Medicine). Effective 01-01-2005, reviewed 13-09-2026.
This calculator provides a general estimate only and does not constitute personalized medical, nutritional, or fitness advice. Consult a registered dietitian for a personalized nutrition plan.
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