Fat Intake Calculator
Written by Thierno Sadou Diallo, formula verified per our methodology • Last checked on 10/10/2026
ANSES (the French food safety agency) recommends that fat make up 35 to 40% of total energy intake. For a need of 2000 kcal/day, that corresponds to a range of about 78 to 89 g of fat per day.
Explanation
Fat is the most energy-dense macronutrient, at 9 kilocalories per gram, compared with 4 for protein and carbohydrates — this conversion factor, known as the Atwater factor, is what lets a percentage of energy intake be translated into a concrete weight of food. In December 2016, ANSES set the nutritional reference for fat intake in adults at a range of 35 to 40% of total energy intake, a range rather than a single value because a slight deviation in either direction remains compatible with a satisfactory dietary balance. This range covers all fat consumed, of every type (saturated, monounsaturated, and polyunsaturated fatty acids, including omega-3 and omega-6); for the breakdown among these different types of fatty acids, see our saturated fatty acid intake calculator and our omega-3 intake calculator, which cover more specific subcategories within this overall fat envelope.
Example: a daily calorie need of 2000 kcal
Inputs
Daily calorie need: 2000 kcal.
Calculation
Minimum = (2000 × 35%) ÷ 9 ≈ 77.8 g. Maximum = (2000 × 40%) ÷ 9 ≈ 88.9 g.
Result
For this calorie need, the recommended fat range is between about 78 and 89 g per day.
Frequently asked questions
Is eating less than 35% fat healthier?
Not necessarily: fat plays an essential role (absorption of certain fat-soluble vitamins, cell membrane structure, supply of essential fatty acids the body cannot synthesize on its own), and significantly dropping below this range over time can compromise these functions. The relevant question is usually less about total fat quantity than about its type (favoring unsaturated fatty acids, found notably in vegetable oils, fatty fish, and nuts, rather than excess saturated fatty acids).
Does this calculation apply to a child or a pregnant woman?
This 35-40% range specifically concerns the nutritional references for healthy adults published by ANSES in 2016. Other populations (growing children, pregnant or breastfeeding women, older adults) may have slightly different fat needs, particularly for essential fatty acids, to be assessed with a healthcare professional rather than with this general reference.
How do I know if I'm eating too much or too little fat?
You need to compare your actual fat intake (estimable via a food-tracking app or the nutrition labels of foods consumed) to the range calculated here for your calorie need. Our calories from macronutrients calculator lets you check the exact share your fat intake represents in your total daily energy intake.