Fat Intake Calculator
Compute your daily grams of dietary fat from a total calorie target and the share of calories you want from fat.
Last updated: September 2026
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About this calculator
Fat provides 9 kcal per gram — more than twice the energy density of carbs or protein — so a small change in fat grams moves total calories a lot. Daily fat grams = (daily calories × fat%) / 9.
The USDA's Acceptable Macronutrient Distribution Range (AMDR) for fat is 20–35% of total calories in adults, with a lower bound of 10% needed for essential fatty acids and fat-soluble vitamin absorption (A, D, E, K). Saturated fat should be kept under 10% of daily calories per the Dietary Guidelines; the American Heart Association recommends under 6% for people with elevated cardiovascular risk.
Ketogenic diets, at the extreme, push fat to 70–75% of calories. Very-low-fat diets (Ornish, Pritikin) go the other way to 10–15% of calories. Both are outside the USDA AMDR and appropriate only for specific medical contexts, so consult a dietitian before adopting either. For most people aiming for weight loss or maintenance on a mixed diet, 25–30% fat combined with 40–50% carbs and 20–25% protein is a common sensible split; the macro calculator at /en/calculators/nutrition/macro-calculator/ helps set the combination.
How to use
Example — a 2 000 kcal/day standard split. Enter calorieIntake = 2000, fatPercent = 30. Result = (2000 × 0.30) / 9 = 600 / 9 ≈ 66.7 g of fat per day. That is the middle of the AMDR range and matches the default 65 g fat DV on Nutrition Facts labels. Example — higher-fat approach. calorieIntake = 2200 (active adult male), fatPercent = 40. Result = (2200 × 0.40) / 9 = 880 / 9 ≈ 97.8 g. Higher than USDA's AMDR ceiling of 35% but still moderate; feasible for Mediterranean-style eating heavy on olive oil, avocado, and fatty fish. Cross-check protein and carbs with /en/calculators/nutrition/macro-calculator/.
Frequently asked questions
How much of my fat should be saturated?
USDA Dietary Guidelines recommend under 10% of daily calories from saturated fat; the American Heart Association tightens that to under 6% for people with cardiovascular risk factors. On a 2 000-cal diet, 10% is 22 g of saturated fat, and 6% is 13 g. That corresponds to roughly one tablespoon of butter (7 g) plus a small serving of cheese (5 g) — far less than a typical American diet.
What are essential fatty acids?
The two essential fatty acids humans cannot synthesize are alpha-linolenic acid (ALA, omega-3) and linoleic acid (LA, omega-6). The AI (Adequate Intake) is 1.1–1.6 g/day of ALA (walnuts, flaxseed, fatty fish) and 11–17 g/day of LA (vegetable oils, nuts, seeds). Long-chain omega-3s (EPA and DHA, from fatty fish) are also strongly beneficial though not strictly 'essential' in the RDA sense.
Are keto diets safe?
Short-term keto diets (weeks to a few months) are generally considered safe for otherwise healthy adults and have proven efficacy for weight loss and glycemic control in type 2 diabetes. Long-term keto raises questions about lipid profile, kidney function, and micronutrient adequacy; run it under medical supervision if you plan to stay in ketosis for more than a few months, and monitor lipid panels and kidney function every 3–6 months.
What about trans fats?
The FDA banned partially hydrogenated oils (the main source of industrial trans fat) in 2018. Naturally occurring trans fat in dairy and beef is different and appears at low levels (under 1% of calories in typical diets), which most guidelines consider negligible. If you spot a nutrition label with 'partially hydrogenated' anything in the ingredients, avoid the product.