Calculate your recommended daily fat intake. Understand healthy fats vs bad fats and optimizing for Keto or Heart Health.
*Based on your TDEE
This guide is for educational purposes and is not medical advice. See our Disclaimer and consult a qualified healthcare professional before making changes to your diet or exercise routine.
For decades fat was treated as something to avoid, but it is one of the three macronutrients your body genuinely needs. Fat is a concentrated source of energy, providing about 9 calories per gram compared with roughly 4 calories per gram from protein and carbohydrates. Beyond fuel, dietary fat plays roles that no other nutrient can fully replace.
The National Academies set an Acceptable Macronutrient Distribution Range (AMDR) for fat of 20 to 35% of your total daily calories, and the Dietary Guidelines for Americans build on the same range. Staying inside that window gives your body enough fat to cover its essential needs while leaving room for protein and carbohydrates. On a 2,000-calorie day, 20 to 35% works out to roughly 44 to 78 grams of fat.
The type of fat matters just as much as the amount:
The math behind fat targets is simple once you have a calorie number to work from. The calculator first estimates your Total Daily Energy Expenditure (TDEE) from your gender, age, weight, height, and activity level using the Mifflin-St Jeor equation. It then converts a percentage of those calories into grams of fat with this formula:
Fat grams = (Total calories × Fat %) ÷ 9
Dividing by 9 turns fat calories into grams, since each gram of fat holds about 9 calories. The tool shows three targets so you can see the full range: a lower-fat 20% target, a balanced 30% target near the middle of the AMDR, and a high-fat 70% target for those following a ketogenic approach.
Say your estimated daily need is 2,000 calories and you want a balanced 30% of calories from fat. Multiply 2,000 by 0.30 to get 600 calories from fat, then divide 600 by 9. That comes to about 67 grams of fat per day. Using the same 2,000 calories, a 20% target lands near 44 grams, which gives you a sense of how the percentage shifts your goal.
| Choose more often | Keep to a minimum |
|---|---|
| Olive oil and other plant oils | Deep-fried foods |
| Nuts and seeds | Processed and cured meats |
| Avocado | Baked goods with partially hydrogenated oils |
| Fatty fish such as salmon and sardines | Heavy servings of butter and full-fat cheese |
A practical approach is to build meals around unsaturated fats, keep saturated fat near the American Heart Association's 5 to 6% of calories, and skip artificial trans fats wherever you can.
On a ketogenic diet, fat becomes your primary fuel source. Instead of relying on glucose from carbohydrates, your liver converts fat into ketones. This is why the calculator's high-fat target sits well above the standard AMDR. Keto is a bigger dietary change, so it is worth discussing with a healthcare professional before you start.
Fat is essential, so dropping well below the recommended range for a long stretch can cause problems. Watch for:
Fat is only one piece of your diet. Balance it with protein and carbohydrates, and use these guides to see the full picture:
The information on this page is based on guidance from the following authoritative sources:
No. Dietary fat is essential for hormone production, nutrient absorption (vitamins A, D, E, K), and brain health. The harmful fats to avoid are trans fats.
Good fats include unsaturated fats found in avocados, nuts, seeds, olive oil, and fatty fish (omega-3s). These support heart health.
A standard Ketogenic diet requires very high fat intake, typically 70-80% of your total daily calories, to become your body's primary fuel source.
There is no single number for everyone. The Dietary Guidelines for Americans and the National Academies recommend that adults get 20 to 35% of total daily calories from fat (the AMDR). On a 2,000-calorie diet that works out to roughly 44 to 78 grams per day. This calculator estimates your daily calorie needs and shows your fat targets across that range.
It first estimates your daily calorie needs (TDEE) from your gender, age, weight, height, and activity level using the Mifflin-St Jeor equation. It then applies each fat percentage to those calories and divides by 9, since each gram of fat provides about 9 calories. For example, 2,000 calories at 30% is 600 fat calories, and 600 divided by 9 is about 67 grams.
The American Heart Association suggests limiting saturated fat to about 5 to 6% of total daily calories, which is roughly 11 to 13 grams on a 2,000-calorie diet. The Dietary Guidelines recommend keeping saturated fat below 10% of calories. Replacing saturated fat with unsaturated fat is linked to better heart health.
Yes. All types of dietary fat, whether saturated, monounsaturated, polyunsaturated, or trans, provide about 9 calories per gram. That is more than double the roughly 4 calories per gram in protein and carbohydrates, so fat portions add up quickly even when the fats are healthy ones.
For most people, a balanced intake within the 20 to 35% range works well and is easy to sustain. Very high-fat approaches like keto and lower-fat approaches both have their place depending on your goals and health needs. There is no one best answer, so it is worth talking with a doctor or registered dietitian before making a major shift.
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