Macro Calculator

Understanding macronutrients

Macronutrients are the three nutrients your body needs in large amounts: protein, carbohydrates, and fat. Together they make up your total calorie intake. Each has a different calorie density: protein and carbs provide 4 calories per gram, while fat provides 9 calories per gram.

Protein (4 cal/g)

Protein builds and repairs muscle, supports immune function, and keeps you full. Active individuals should aim for 0.7–1g of protein per pound of body weight. Higher protein intakes (35–40% of calories) help preserve muscle during weight loss and boost satiety.

Carbohydrates (4 cal/g)

Carbs are your body's preferred energy source, especially for high-intensity exercise and brain function. While low-carb and keto diets restrict them, carbs are not inherently fattening — total calories matter most for weight management.

Fat (9 cal/g)

Dietary fat is essential for hormone production, vitamin absorption, and cell health. Avoid dropping fat below 20% of calories, as very low-fat diets can disrupt hormones. Healthy fat sources include olive oil, nuts, avocado, and fatty fish.

Which macro split is best?

There's no single "best" ratio — it depends on your goals and preferences. Balanced (30/40/30) works for most people. High-protein is great for muscle retention and fat loss. Keto (low-carb) helps some people control appetite. The best diet is the one you can stick to long-term. Always consult a registered dietitian for personalized nutrition advice.

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