Fat Intake Calculator
Daily fat target in grams from your calories, with the saturated-fat ceiling, the omega-6 and omega-3 essential fatty acid minimums, and the IOM 20–35% range.
Fat Intake Calculator: with the default inputs, total fat per day is 73.
Your target intake. The calorie calculator works it out from your body and activity.
Used only for the essential fatty acid adequate intakes, which differ by sex.
grams
- Fat per meal
- 24grams
- Saturated fat ceiling
- 24grams — under 10% of calories (Dietary Guidelines for Americans).
- Saturated fat, AHA target
- 15grams — 6% of calories, for people lowering LDL cholesterol.
- Room left for unsaturated fat
- 49grams — total fat minus the saturated ceiling.
- Omega-6 (linoleic acid) adequate intake
- 17grams a day
- Omega-3 (alpha-linolenic acid) adequate intake
- 1.6grams a day
- Guideline range for your age
- 20–35% of calories (adults)
Assumptions
- Fat supplies 9 kcal per gram (Atwater factor); the share is applied to the calorie target you enter.
- Total-fat AMDR from the IOM 2005 DRI report: 20–35% of energy for adults, 25–35% for ages 4–18, 30–40% for ages 1–3.
- Saturated-fat ceiling is the Dietary Guidelines for Americans 2020–2025 limit of under 10% of calories (age 2 and above); the 6% figure is the American Heart Association's LDL-lowering target.
- Essential fatty acid figures are IOM adequate intakes for linoleic and alpha-linolenic acid — not requirements for EPA and DHA, which have no US RDA.
- General guidance for healthy people. It is an estimate, not a diagnosis or a treatment plan.
| Grams a day | Calories | Basis | |
|---|---|---|---|
| Total fat | 73 | 660 | 30% of calories — AMDR is 20–35% of calories (adults) |
| Saturated fat, maximum | 24 | 220 | Under 10% of calories — Dietary Guidelines for Americans 2020–2025 |
| Saturated fat, AHA target | 15 | 132 | 6% of calories — American Heart Association, for LDL lowering |
| Omega-6, linoleic acid | 17 | 153 | IOM adequate intake for your age and sex |
| Omega-3, alpha-linolenic acid | 2 | 14 | IOM adequate intake for your age and sex |
| Trans fat | 0 | 0 | As low as possible — industrial trans fat has no safe intake |
How this is worked out
The formula
Fat (g/day) = daily calories × fat share ÷ 9 kcal/g Saturated fat ceiling (g/day) = calories × 10% ÷ 9 (Dietary Guidelines for Americans) AHA target (g/day) = calories × 6% ÷ 9 (for LDL lowering) Fat AMDR = 20–35% of calories for adults, 25–35% ages 4–18, 30–40% ages 1–3 (IOM)
Open How it’s calculated above to see this worked through with your own numbers.
What you enter
- Daily calories
- Your target intake. The calorie calculator works it out from your body and activity.from 500 to 10000 · defaults to 2200
- Fat share of calories
- Choose one of 7 options.Lower end of the guideline range — 20% of calories · 25% of calories · Middle of the guideline range — 30% of calories · Upper end of the guideline range — 35% of calories · Higher-fat / Mediterranean style — 40% of calories · Ketogenic — 70% of calories · Custom (set the percentage under More options)
- Sex
- Used only for the essential fatty acid adequate intakes, which differ by sex.Male · Female
- Age
- A number.from 1 to 120 · whole numbers only · defaults to 35
- Meals per day
- A number.from 1 to 8 · whole numbers only · defaults to 3
- Custom fat percentage(under More options)
- Used only when the split above is set to Custom.a percentage · from 0 to 90 · defaults to 30
What you get back
- Total fat per daymain answer
- grams
- Fat per meal
- grams
- Saturated fat ceiling
- grams — under 10% of calories (Dietary Guidelines for Americans).
- Saturated fat, AHA target
- grams — 6% of calories, for people lowering LDL cholesterol.
- Room left for unsaturated fat
- grams — total fat minus the saturated ceiling.
- Omega-6 (linoleic acid) adequate intake
- grams a day
- Omega-3 (alpha-linolenic acid) adequate intake
- grams a day
- Guideline range for your age
What this assumes
- Fat supplies 9 kcal per gram (Atwater factor); the share is applied to the calorie target you enter.
- Total-fat AMDR from the IOM 2005 DRI report: 20–35% of energy for adults, 25–35% for ages 4–18, 30–40% for ages 1–3.
- Saturated-fat ceiling is the Dietary Guidelines for Americans 2020–2025 limit of under 10% of calories (age 2 and above); the 6% figure is the American Heart Association's LDL-lowering target.
- Essential fatty acid figures are IOM adequate intakes for linoleic and alpha-linolenic acid — not requirements for EPA and DHA, which have no US RDA.
- General guidance for healthy people. It is an estimate, not a diagnosis or a treatment plan.
About this calculator
Fat is nine calories a gram — more than twice carbohydrate or protein — so small changes in fat move a day's calories a long way. This calculator turns a calorie target into grams of fat, then adds the three numbers that matter more than the headline: how much of it can be saturated, and how much has to be omega-6 and omega-3 because your body cannot make them.
How to use it
Enter your daily calories, pick a share of calories from fat, and set your age and sex — the essential fatty acid minimums differ by both. Under More options you can type an exact percentage. Three meals is the default divisor for the per-meal figure; change it if you eat differently.
How to read the results
- Total fat comes from the Institute of Medicine's Acceptable Macronutrient Distribution Range: 20–35% of calories for adults, 25–35% for ages 4–18, and 30–40% for ages 1–3, because small children need the energy density. The range is wide on purpose. Within it, what you eat matters more than how much.
- The saturated-fat ceiling is the Dietary Guidelines for Americans limit — under 10% of calories from age 2 on. The American Heart Association goes further, to 5–6%, for anyone who needs to lower LDL cholesterol. Both are shown so you can see the gap.
- Omega-6 (linoleic acid) and omega-3 (alpha-linolenic acid) are the two fats humans genuinely cannot synthesise. The IOM sets adequate intakes of 17 g and 1.6 g a day for men aged 19–50, and 12 g and 1.1 g for women. Almost anyone eating nuts, seeds and vegetable oils clears the omega-6 figure without trying; the omega-3 figure is the one people miss. A tablespoon of ground flaxseed or a handful of walnuts covers it.
- Room left for unsaturated fat is your total minus the saturated ceiling. That is the space for olive oil, nuts, avocado and oily fish.
What the evidence actually supports
Replacing saturated fat with polyunsaturated fat lowers cardiovascular events; replacing it with refined carbohydrate does not. That replacement — not total fat — is the finding that survived four decades of trials and meta-analyses. This is why the guidance shifted from "eat less fat" to "eat better fat," and why the AMDR is a 15-point-wide band rather than a target.
Industrial trans fat is the one fat with no safe intake. It is largely gone from the US supply since the FDA's 2015 determination, but "0 g trans fat" on a label can still mean up to 0.5 g per serving, so check for partially hydrogenated oil in the ingredients.
Caveats
These are reference intakes for healthy people, and they say nothing about your labs. If you have familial hypercholesterolaemia, pancreatitis, gallbladder disease, or are on a fat-restricted diet for malabsorption, your target is a clinical decision, not a percentage. The calculator also assumes the calorie figure you enter is right — if that is off, every gram figure below it is off by the same proportion.
Frequently asked questions
▸How many grams of fat should I eat a day?
On 2,000 calories, the 20–35% guideline range works out to 44–78 g a day. Thirty per cent — about 67 g — sits in the middle and is a reasonable default for most adults.
▸How much saturated fat is too much?
The Dietary Guidelines cap it at under 10% of calories: about 22 g on a 2,000 kcal diet. The American Heart Association recommends 5–6% — roughly 13 g — for people who need to lower LDL cholesterol.
▸Does eating fat make you fat?
Only through calories. Fat is 9 kcal a gram against 4 for carbohydrate and protein, so it is easy to overshoot, but trials matching calories find no special fattening effect. Total intake is what moves body weight.
▸How much omega-3 do I need?
The IOM adequate intake for alpha-linolenic acid is 1.6 g a day for men and 1.1 g for women — a tablespoon of ground flaxseed or an ounce of walnuts. That is separate from EPA and DHA from oily fish, for which there is no US RDA; most heart guidelines suggest two servings of fish a week.
▸Should I count fat or calories?
Calories, with protein as the second priority. Fat and carbohydrate split the remainder however suits your appetite and cooking. This calculator exists to convert a share of calories into grams you can shop with, not to argue that fat is the number to chase.
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