Fat Intake Calculator

Daily fat grams · AMDR range · Saturated fat caps

Age

yrs

Sex

Male

Female

Height

Weight

lbs

Calorie estimate

BMR formula ?

Activity level

Or enter daily calories ?

kcal

Fat target

📌

Fat provides about 9 kcal per gram. Results are planning estimates, not medical advice.

🥑 Enter height, weight, and activity to see daily fat grams and saturated fat limits.

How Fat Intake Is Calculated

This fat intake calculator first estimates daily calories (or uses your override), then converts a chosen fat percentage into grams using 9 kcal per gram.

Mifflin St Jeor BMR

Men: BMR = 10×kg + 6.25×cm − 5×age + 5 Women: BMR = 10×kg + 6.25×cm − 5×age − 161 Example (man, 72.6 kg, 178 cm, age 30): BMR ≈ 1,694 kcal

TDEE and fat grams

TDEE = BMR × activity factor Fat g = (calories × fat %) ÷ 9 Example: 2,600 kcal × 30% ÷ 9 ≈ 87 g fat/day

What You Get From This Tool

Daily fat target: grams and calories from your chosen fat percentage
AMDR band: age based Acceptable Macronutrient Distribution Range for total fat
Saturated fat caps: gram limits at under 10% and under 7% of calories
BMR and TDEE: Mifflin St Jeor or Katch McArdle with activity multipliers
Charts: fat share of calories and fat grams at 20%, 25%, 30%, and 35%

💡

Stay inside your AMDR band for total fat, then keep saturated fat well below the 10% ceiling when heart health is a priority.

What Is a Fat Intake Calculator?

A fat intake calculator estimates how many grams of dietary fat fit a daily calorie budget. Fat is one of three energy yielding macronutrients, along with carbohydrate and protein. It supplies energy, carries fat soluble vitamins (A, D, E, and K), and supports cell membranes and hormone production.

People use this tool to answer how much fat per day they should eat, what 20% to 35% of calories looks like in grams, and how strict saturated fat limits translate into food choices.

Types of dietary fat

Saturated fat is common in fatty meats, full fat dairy, coconut, and palm oils. Public health guidance treats high saturated fat intake as a risk factor for higher LDL cholesterol for many people.

Trans fat from partial hydrogenation is not essential and should be minimized. Labels may round very small amounts down to zero, so check ingredient lists for partially hydrogenated oils.

Monounsaturated and polyunsaturated fats (including omega 3 fatty acids from some fish and plant sources) are the fats most guidelines encourage in place of saturated fat when you swap cooking fats and protein foods.

AMDR fat ranges by age

The Acceptable Macronutrient Distribution Range describes fat as a share of total calories, not a fixed gram number for everyone:

Age	Suggested fat share of calories
2 to 3 years	30% to 40%
4 to 18 years	25% to 35%
19 years and older	20% to 35%

How to use this calculator

Choose US or metric units and enter age, sex, height, and weight.
Pick Mifflin St Jeor (default) or Katch McArdle with body fat percent.
Select activity level, or enter your own daily calorie target.
Choose 20%, 30%, 35%, or a custom fat percentage.
Read daily fat grams, the AMDR band for your age, and saturated fat gram ceilings.

Worked example

Adult man, age 30, 5 ft 10 in, 160 lb, moderate activity, Mifflin St Jeor. Weight ≈ 72.6 kg, height ≈ 178 cm. BMR ≈ 10×72.6 + 6.25×178 − 5×30 + 5 ≈ 1,694 kcal. TDEE ≈ 1,694 × 1.55 ≈ 2,626 kcal.

At 30% fat: fat calories = 0.30 × 2,626 ≈ 788 kcal. Fat grams = 788 ÷ 9 ≈ 87 g/day. Saturated fat under 10% ≈ 263 kcal ÷ 9 ≈ 29 g. Under 7% ≈ 184 kcal ÷ 9 ≈ 20 g.

Saturated fat guidance

United States Dietary Guidelines for Americans recommend keeping saturated fat to less than 10% of calories for ages 2 and older. Many clinicians and heart focused organizations suggest aiming closer to 5% to 6% or under about 7% when lowering LDL is the goal. This page shows both a 10% ceiling and a 7% planning ceiling so you can compare.

Common mistakes

Treating all fat as equally harmful and cutting too low for vitamins and satiety
Confusing body fat percentage with dietary fat grams
Using a fat percent outside the AMDR without a supervised reason
Ignoring saturated fat while only tracking total fat grams
Forgetting that alcohol and added sugars also take room in the calorie budget

When this calculator is useful

Use it to set a daily fat gram target, check that your macro plan sits inside an age appropriate AMDR, and translate saturated fat percent limits into grams. Pair it with the Macro Calculator, Protein Calculator, TDEE Calculator, and Calorie Calculator for a full energy and macro plan.

When results may not fit

Medical conditions, lipid disorders, gallbladder disease, and prescribed diets need clinician or dietitian guidance. Very low fat therapeutic diets are outside the simple AMDR planning model. Pregnancy, childhood growth, and athletic fueling may shift calorie needs more than this page’s activity multipliers capture.

Calculation Methodology

Convert height and weight to metric units when needed.
Estimate BMR with Mifflin St Jeor, or with Katch McArdle when body fat percent is provided (BMR ≈ 370 + 21.6 × lean kg).
Multiply BMR by the selected activity factor to get TDEE, unless you enter custom calories.
Select the AMDR fat band from age (2 to 3, 4 to 18, or 19+).
Compute fat calories = daily calories × fat percent, then fat grams = fat calories ÷ 9.
Compute saturated fat gram ceilings at 10% and 7% of daily calories ÷ 9.

⚠️

Results are educational estimates for personal planning. They are not medical nutrition therapy and do not replace professional advice.

Reference: Fat Grams From Calories

At a 2,000 kcal day (common label reference):

Fat %	Fat kcal	Fat grams
20%	400	≈ 44 g
25%	500	≈ 56 g
30%	600	≈ 67 g
35%	700	≈ 78 g

Saturated fat under 10% of 2,000 kcal is 200 kcal, or about 22 g. Under 7% is about 16 g. Your live results scale these ideas to your calorie target.

Frequently Asked Questions

How much fat should I eat per day?

Most adults land near 20% to 35% of calories from fat. Convert with grams = (calories × percent) ÷ 9. This calculator estimates calories first, then applies your chosen percent.

What is the saturated fat limit?

Dietary Guidelines recommend less than 10% of calories from saturated fat. Many heart focused plans aim near 7% or lower. Divide those calorie caps by 9 for grams.

How do you calculate fat grams from calories?

Multiply daily calories by the fat decimal, then divide by 9. Example: 2,400 × 0.30 ÷ 9 ≈ 80 g fat per day.

Is dietary fat bad for you?

No. Fat is essential. Focus on overall pattern: prefer unsaturated fats more often, keep saturated fat within guidance, and minimize industrial trans fat.

Does fat intake differ by age?

Yes. Young children often need a higher fat share of calories than adults. This tool shows the AMDR band that matches the age you enter.

Should I use body fat percent for this calculator?

Only if you choose Katch McArdle for BMR. Otherwise Mifflin St Jeor needs height, weight, age, and sex. Dietary fat targets still come from calories × percent ÷ 9 either way.

Sources & References

U.S. Departments of Agriculture and Health and Human Services — Dietary Guidelines for Americans: dietaryguidelines.gov
American Heart Association — Saturated fat guidance: heart.org saturated fats
National Academies / IOM — Dietary Reference Intakes macronutrient distribution ranges (AMDR overview via NIH ODS): ods.od.nih.gov nutrient recommendations

Last reviewed for methodology: 2026. Estimates on this page are for education only and are not medical advice.