Fat Intake Calculator: Daily Fat Grams

Reading your fat budget

Pick a Pattern in section 01 that matches how you eat, then read total fat grams and the sat/mono/poly breakdown in section 02. Optional lipids change only the saturated ceiling, not TDEE.

Example: 5′9″, 165 lb, male, light activity, Balanced

By default: age 30, male, 5′9″ (165 lb), Light (1.375×) activity, Balanced pattern. BMR ≈ 1,699 kcal → TDEE ≈ 2,336 kcal. Total fat = 30% of TDEE ÷ 9 ≈ 78 g/day. Saturated cap at 10% ≈ 26 g; monounsaturated target at 15% ≈ 39 g; polyunsaturated remainder ≈ 13 g. Omega-3 target 500 mg EPA/DHA (0.5 g on the card). Trans fat limit 0 g.

Heart vs Keto patterns on the same stats

Switching Pattern in section 01 changes fat grams, not TDEE. On Heart: 25% fat → about 65 g/day, saturated cap 7% → about 18 g, omega-3 target 1,000 mg. On Keto: 70% fat → about 182 g/day with the default 10% saturated ceiling unless optional lipids tighten it.

Optional LDL/HDL and the donut

Expand Optional lipids and enter LDL above 160 mg/dL or HDL below 40 mg/dL. Saturated fat cap drops to 7% of kcal even on Balanced or Keto (about 18 g saturated at default TDEE instead of 26 g). The modeled-mix donut updates sat/mono/poly gram targets; it does not reflect foods you ate.

Fat intake calculator: grams from TDEE and fat pattern

This calculator turns Mifflin–St Jeor TDEE into daily fat grams for Heart, Balanced, or Keto patterns with saturated caps and omega-3 targets. It is educational planning only, not medical or lipid treatment advice.

What this calculator does

Turns estimated maintenance calories into daily fat grams for Heart, Balanced, or Keto patterns selected in section 01. TDEE uses Mifflin–St Jeor BMR (10 × weight kg + 6.25 × height cm − 5 × age, plus 5 for male or −161 for female) multiplied by your activity tier. Heart and flagged optional lipids cap saturated fat at 7% of kcal; Balanced and Keto default to 10%. Monounsaturated fat is modeled at 15% of kcal; polyunsaturated fills the remainder. Trans fat target is 0 g; omega-3 is a single EPA/DHA milligram goal. It does not track meals, model medium-chain triglycerides (MCTs) separately, check Acceptable Macronutrient Distribution Range (AMDR) for all macros, or replace lipid panels. All math runs locally.

Total fat:

$\text{Fat (g)} = \frac{\text{TDEE} \times \text{Fat \%}}{9}$
Saturated cap:

$\text{Sat fat (g)} = \frac{\text{TDEE} \times \text{Limit \%}}{9}$
Pattern fat %:

Heart 25%, Balanced 30%, Keto 70% of TDEE from fat.

How the math works

BMR follows Mifflin–St Jeor; TDEE rounds BMR × activity multiplier. Total fat grams round from TDEE × pattern percent ÷ 9. Saturated grams use 7% on Heart (or when optional LDL/HDL triggers) and 10% otherwise. Monounsaturated grams use 15% of TDEE ÷ 9; polyunsaturated grams are total fat minus saturated cap minus mono target, floored at zero. Omega-3 targets are 500 mg on Balanced/Keto and 1,000 mg on Heart.

Limits of the model

TDEE is an estimate, not a measured burn rate. Optional LDL/HDL fields only adjust the saturated-fat percentage in this worksheet; they do not change total fat percent or TDEE. Swap suggestions on Heart and Keto are illustrative, not logged intake. The donut shows formula-driven gram targets, not your actual diet. For full macro splits including protein and net carbs, use the related calculators below; this page focuses on fat grams from TDEE and pattern alone.

FAQ

How does this calculator estimate daily fat grams?

It computes total daily energy expenditure (TDEE) with Mifflin–St Jeor basal metabolic rate (BMR) × your activity multiplier, then applies your Pattern fat percent (Heart 25%, Balanced 30%, Keto 70%) and divides by 9 kcal/g. Formula: fat grams = TDEE × fat% ÷ 9.

What is the daily limit for saturated fat?

American Heart Association (AHA) guidance often cites <7% of calories for heart-risk patterns and <10% for general health. In this tool, the Heart pattern uses 7%; Balanced and Keto default to 10%. Optional LDL >160 or HDL <40 also forces 7%. Grams = TDEE × limit% ÷ 9.

Why are trans fats set to zero?

Partially hydrogenated oils are largely gone from U.S. food manufacturing, and there is no safe intake level for artificial trans fat. This calculator shows 0 g as the target. Still read ingredient lists for "partially hydrogenated" oil; labels can round small amounts to zero per serving.

How much omega-3 does this model target?

Balanced and Keto patterns target 500 mg combined EPA and DHA; Heart targets 1,000 mg. That is a planning number, not a prescription. Fatty fish twice weekly or a tested supplement can cover it; plant ALA converts poorly to EPA/DHA.

Does this calculator diagnose high cholesterol?

No. Optional LDL and HDL fields only tighten the saturated-fat cap to 7% of calories when LDL >160 or HDL <40 in this model. Use your lab report and clinician for treatment decisions.

What does the modeled-mix donut show?

It charts gram targets for saturated, monounsaturated, and polyunsaturated fat using the sat/mono/poly rules in the section 02 panel, not food you logged. Monounsaturated fat is fixed at 15% of TDEE; polyunsaturated fat fills what remains after the saturated cap and mono target.

Can I eat too much healthy fat?

Unsaturated fats still carry 9 kcal/g. Olive oil and nuts help when they replace saturated fat, but extra calories from any source can add weight. Quality and quantity both matter.

When do Heart or Keto swap suggestions appear?

The Swaps block under section 02 shows optional food substitutions when Heart or Keto is selected (for example butter → olive oil on Heart). They are nudges only; this tool does not track meals or adjust TDEE from swaps.

Sources & citations

References used for the calculation method and definitions. Links open in a new tab when available.

[1]

Dietary Fats and Cardiovascular Disease: A Presidential Advisory from the AHA

AHA guidance on saturated fat limits and replacing saturated fat with unsaturated sources.

[2]

Omega-3 Fatty Acids – NIH Office of Dietary Supplements

EPA/DHA intake references and ALA conversion limits.

Fitness Reference Note

Informational Use: These calculations (BMI, Calories, etc.) are based on standard statistical formulas and are intended for general reference and goal-setting purposes only.

Consult Experts: This tool does not provide medical advice, diagnosis, or treatment. Results may not be accurate for athletes, pregnant individuals, or those with underlying health conditions.

Health Safety: Always consult with a healthcare professional or qualified trainer before beginning any new diet or intensive exercise program.

Privacy First: All calculations are performed locally in your browser. No health data is stored or transmitted to any server.

Fat Intake Calculator

Baseline

Fat budget

Modeled mix

How to use this calculator