Quick answer: On 2,000 kcal a day, the recommended 20–35% of calories from fat is 2,000 × 20% ÷ 9 to 2,000 × 35% ÷ 9, or 44 to 78 g a day, with saturated fat under 22 g.
How it's calculated
Fat grams = daily calories × share ÷ 9, because each gram of fat gives about 9 kcal (the general Atwater factor). Some calculators use 8.8 kcal per gram (37 kJ/g, the FAO metric factor), which gives about 2% more grams. The National Academies set the acceptable range for adults at 20–35% of calories.
WHO and the US Dietary Guidelines advise keeping saturated fat under 10% of calories, and WHO advises trans fat under 1%. On 2,000 kcal that is under 22 g of saturated fat and about 2 g of trans fat. Ghee, butter, fatty meat, coconut and palm oil are high in saturated fat; olive oil, nuts and fish are mostly unsaturated.
The grams follow from the calorie number, so estimate that first with the calorie calculator. A gram target does not show the type of fat you eat, which matters as much for heart health as the amount.
Worked examples
- 2,000 kcal at 30%: 2000 × 0.30 ÷ 9 = 66.7 g
- 2,000 kcal, saturated limit: 2000 × 0.10 ÷ 9 = 22.2 g
- 2,500 kcal, 20–35% range: 55.6 – 97.2 g
Frequently asked questions
How much fat should I eat a day?
For adults, 20–35% of calories: about 44–78 g on 2,000 kcal. WHO suggests total fat under 30% to help prevent unhealthy weight gain.
What is the saturated fat limit?
Under 10% of calories, which is about 22 g a day on 2,000 kcal.
Is a low-fat diet better?
Not necessarily. Below about 20% of calories it becomes harder to get essential fatty acids and fat-soluble vitamins; the type of fat matters more than cutting it as low as possible.
Which fats are healthier?
Mostly unsaturated fats, such as olive oil, nuts, seeds and oily fish. Keep saturated fat low, and limit butter, ghee, fatty meat and pastries.
What is the limit for trans fat?
WHO advises under 1% of your calories, or about 2 g a day on a 2,000 kcal diet. Check labels for partially hydrogenated oils.
Does eating fat make you gain weight?
Not by itself. Weight follows total calories, though fat has more than twice the calories of carbohydrate per gram, so portions add up quickly.