Calculate your recommended daily fat intake in grams based on your calorie needs, activity level, and dietary goal — including a breakdown by fat type.
| Diet Type | Fat % | Fat (g) |
|---|---|---|
| Lose Weight | 25% | 66g |
| Maintain Weight | 30% | 79g |
| Build Muscle | 30% | 79g |
| Ketogenic Diet | 70% | 184g |
| Low-Fat Diet | 15% | 40g |
Fat provides 9 kcal per gram. The DRI recommends 20–35% of calories from fat for adults. Trans fats should be avoided entirely. Limit saturated fat to <10% of calories.
How many grams of fat should I eat in a day? There is no single answer, because fat is usually set as a share of calories, and this page lets that share depend on your goal: 15% for low-fat, 25% when losing weight, 30% for maintaining or building muscle, and 70% for a ketogenic diet. It starts from your estimated calorie target, converts the share to grams at 9 kcal per gram, then divides the total between saturated, monounsaturated and polyunsaturated fat.
Target calories = TDEE + goal adjustment (−500 for Lose Weight, +300 for Build Muscle, 0 for the rest), never below 1,200. TDEE is Mifflin-St Jeor BMR times an activity factor from 1.2 to 1.9. Fat calories = target × fat share, and fat grams = fat calories ÷ 9. Grams per kilogram is fat grams ÷ body weight in kg. The type breakdown splits your total grams in fixed proportions: 25% saturated, 40% monounsaturated and 35% polyunsaturated. For context, the Dietary Guidelines for Americans keep saturated fat under 10% of calories, and the Dietary Reference Intakes give an acceptable range of 20 to 35% of calories from fat for adults.
What changes if you alter one input? For the example below, with a 2,371 kcal target at maintenance, each percentage point of fat is worth about 2.6 g. Dropping from 30% to 25% takes fat from 79 g to 66 g. The Low-Fat Diet option (15%) gives 40 g and the Ketogenic option (70%) gives 184 g, because the share, not your weight, is the lever. Switching the goal to Lose Weight both cuts calories to 1,871 and uses 25%, so fat falls to 52 g, about a third below maintenance.
Worked example: a 25-year-old man, 75 kg, 175 cm, lightly active, goal Maintain. BMR = 750 + 1,093.75 − 125 + 5 = 1,723.75, rounded to 1,724, and TDEE = 1,724 × 1.375 = 2,371 kcal. Fat calories = 2,371 × 0.30 = 711, and fat grams = 711 ÷ 9 = 79 g, or 1.1 g/kg. The breakdown is 79 × 0.25 = 20 g saturated, 79 × 0.40 = 32 g monounsaturated and 79 × 0.35 = 28 g polyunsaturated. Those 20 g of saturated fat are 180 kcal, or 7.6% of 2,371, inside the 10% guideline.
The split is fixed at 25/40/35 whichever diet you choose. At 184 g, the 25% saturated share is 46 g, or 414 kcal, which is 17.5% of 2,371 calories and well above the under-10% guideline printed beside it. Adjust the split yourself and ask a clinician before following a very high-fat plan.
It sits below the 20 to 35% range the Dietary Reference Intakes give for adults, so the Low-Fat Diet option is an aggressive choice. At 2,371 kcal it works out to 40 g a day. Talk it over with a registered dietitian before sticking to it.
No. It is grams of fat itself. A tablespoon of olive oil carries about 14 g, so 79 g is a bit under six tablespoons if oil were your only source, though most fat arrives hidden inside other foods.
Yes. If a small user's Lose Weight target would fall below 1,200, the page uses 1,200, and 25% of that is 300 kcal, or 33 g of fat.