Free Nutrition Calculator

Your daily calories & macros, calculated in seconds

Enter your stats and goal — get a personalized breakdown of calories, protein, carbs, and fat.

3Goals supported
5Activity levels
100%Free, no signup
Calculate My Macros ↓

Enter your details

We use the Mifflin-St Jeor formula — the most accurate method for estimating BMR.

Your daily nutrition target:

calories per day
Protein
—%
Carbs
—%
Fat
—%
Protein
0%
Carbs
0%
Fat
0%

How the calculator works

We follow the same formulas used by registered dietitians and sports nutritionists.

1

Calculate BMR

Basal Metabolic Rate — calories your body needs at complete rest — calculated using the Mifflin-St Jeor equation.

2

Apply activity multiplier

BMR is multiplied by your activity factor to get TDEE — your total daily energy expenditure.

3

Adjust for your goal

We apply a 15–20% deficit for fat loss or a 10–15% surplus for muscle gain, based on evidence-based guidelines.

4

Split into macros

Calories are split into protein, carbohydrates, and fat using goal-specific ratios.

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Frequently asked questions

BMR (Basal Metabolic Rate) is the calories your body burns at rest. TDEE (Total Daily Energy Expenditure) includes BMR plus calories burned through daily activity and exercise. TDEE is the number to use for nutrition planning.
The Mifflin-St Jeor formula has an average error of around 10% for healthy adults. Use the result as a starting point and adjust by 100–150 kcal based on real-world results after 2–3 weeks.
For active individuals, 1.6–2.2 grams of protein per kilogram of body weight is the evidence-based recommendation. The calculator sets protein to approximately 2g/kg for muscle gain and fat loss goals.
This calculator is designed for generally healthy adults. If you have a medical condition such as diabetes or kidney disease, please consult a registered dietitian before making significant dietary changes.