Daily Fat Intake Calculator
Use this Daily Fat Intake Calculator to find your personalized total fat target plus a breakdown by fat type: saturated, monounsaturated, and polyunsaturated. Based on your body stats, activity level, and health goal using the Mifflin-St Jeor equation and DRI macro guidelines.
How Your Fat Target Is Calculated
This calculator uses the Mifflin-St Jeor equation for BMR, multiplied by your activity factor to get TDEE, then adjusted for your goal. Fat is then allocated as a percentage of total calories using DRI AMDR guidelines (20 to 35% of total calories from fat). Since fat provides 9 calories per gram, each gram counts nearly twice as much as carbohydrates or protein.
Goal-Based Fat Allocation
For weight loss, fat is set at 25% of total calories. The deficit comes primarily from reducing overall intake rather than aggressively cutting any single macro. For maintenance, fat is set at 30%, aligned with the midpoint of the DRI AMDR. For muscle gain, fat is reduced to 20% to make caloric room for the higher carbohydrate intake that supports training performance and glycogen replenishment.
Fat Type Targets
Of your total fat intake, the breakdown by type matters as much as the total. Saturated fat is capped at 10% of total calories per American Heart Association and DRI guidelines. Monounsaturated fat (MUFA) is allocated 15 to 20% of calories as the primary fat source. Polyunsaturated fat (PUFA) is targeted at 5 to 10% of calories, covering both omega-3 and omega-6 essential fatty acids.
The Four Types of Dietary Fat
Saturated Fat - Limit
Found primarily in animal products (red meat, butter, full-fat dairy, lard) and some tropical oils (coconut, palm). Saturated fat raises LDL cholesterol in most people. The 2020 to 2025 Dietary Guidelines for Americans and the AHA both recommend limiting saturated fat to under 10% of total calories, and replacing it with unsaturated fats where possible.
Monounsaturated Fat (MUFA) - Prioritize
Found in olive oil, avocado, almonds, cashews, and peanuts. MUFA is the cornerstone of the Mediterranean diet. It maintains or raises HDL while lowering LDL, and has anti-inflammatory properties. There is no strict upper limit, but it should make up the majority of your fat intake.
Polyunsaturated Fat (PUFA) - Include
Divided into omega-3 (fatty fish, walnuts, flaxseed, chia) and omega-6 (vegetable oils, sunflower seeds). Both are essential fatty acids the body cannot synthesize. Omega-3s, particularly EPA and DHA from fatty fish, have the strongest evidence for cardiovascular and anti-inflammatory benefits. Most people consume sufficient omega-6 but are low in omega-3.
Trans Fat - Eliminate
Industrially produced trans fats (partially hydrogenated oils) have been banned in most countries due to strong evidence linking them to cardiovascular disease. They raise LDL and lower HDL simultaneously. Natural trans fats in small amounts in ruminant animals (conjugated linoleic acid) do not carry the same risk. Check labels for hydrogenated oils in processed foods.
Frequently Asked Questions
How much fat should I eat per day to lose weight?
Fat intake for weight loss is determined by your total calorie target, not by fat restriction alone. At a calorie deficit, fat is typically set at 20 to 25% of total calories. Extremely low-fat diets (under 15%) are difficult to sustain and can impair absorption of fat-soluble vitamins A, D, E, and K. A moderate fat intake within a calorie deficit is more effective and sustainable than aggressive fat restriction.
Is eating fat bad for your heart?
The relationship between dietary fat and heart disease is more nuanced than older guidelines suggested. Saturated fat in excess raises LDL cholesterol and is associated with increased cardiovascular risk. Unsaturated fats (MUFA and PUFA) are cardioprotective. The key is fat quality: replacing saturated fat with unsaturated fat consistently improves cardiovascular outcomes in clinical research. Total fat quantity is less important than fat type.
How much saturated fat is too much?
The DRI and American Heart Association both recommend keeping saturated fat under 10% of total daily calories. For a 2,000 kcal diet, that is no more than 22 g of saturated fat per day. The AHA further recommends aiming for 5 to 6% (about 11 to 13 g/day) for those with elevated LDL or cardiovascular risk. A single tablespoon of butter contains about 7 g of saturated fat as a reference point.
Should I eat more fat on a ketogenic diet?
Yes. Standard ketogenic diets derive 60 to 75% of calories from fat, which is far above the DRI AMDR upper limit of 35%. This calculator uses standard DRI ranges and is not designed for ketogenic diet planning. If you follow a ketogenic protocol, your fat target will be significantly higher than this calculator provides, and medical supervision is advisable, especially for those with lipid disorders.
What are the best sources of healthy fat?
Extra-virgin olive oil and avocado oil for cooking, avocados, fatty fish (salmon, mackerel, sardines) two or more times per week, walnuts and flaxseed for omega-3, and almonds, cashews, and peanuts for MUFA. These sources provide fat alongside fiber, micronutrients, or protein, making them nutritionally superior to refined fat sources like margarine or highly processed vegetable oils.
References
- Mifflin MD, et al. A new predictive equation for resting energy expenditure in healthy individuals. Am J Clin Nutr. 1990;51(2):241-247. https://pubmed.ncbi.nlm.nih.gov/2305711/
- Institute of Medicine. Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids. National Academies Press; 2005. https://www.ncbi.nlm.nih.gov/books/NBK56068/
- U.S. Department of Agriculture and U.S. Department of Health and Human Services. Dietary Guidelines for Americans 2020-2025. https://www.dietaryguidelines.gov/
- American Heart Association. Dietary Fats. https://www.heart.org/en/healthy-living/healthy-eating/eat-smart/fats/dietary-fats
- Sacks FM, et al. Dietary Fats and Cardiovascular Disease: A Presidential Advisory From the American Heart Association. Circulation. 2017;136(3):e1-e23. https://pubmed.ncbi.nlm.nih.gov/28620111/
