Macros Calculator

What Are Macros and Why Do They Matter?

Macronutrients — protein, carbohydrates, and fat — are the three main categories of nutrients that provide calories. Protein and carbohydrates each provide 4 calories per gram; fat provides 9 calories per gram. Tracking macros goes beyond simply counting calories by ensuring you consume the right ratios to support your specific fitness goal.

Protein builds and maintains muscle, supports immune function, and is highly satiating. Carbohydrates are the primary fuel for exercise and brain function. Fat supports hormone production, vitamin absorption, and sustained energy.

Calorie to Gram Conversion

Protein: Grams = Calories × Protein% / 4 Carbs: Grams = Calories × Carb% / 4 Fat: Grams = Calories × Fat% / 9

Macro Split Recommendations by Goal

Goal	Protein	Carbs	Fat
Weight Loss	35%	35%	30%
Maintenance	30%	40%	30%
Muscle Gain	30%	45%	25%
Ketogenic	25%	5%	70%
Endurance Sports	20%	55%	25%

Frequently Asked Questions

The evidence-based recommendation for active adults is 1.6–2.2 grams of protein per kilogram of body weight. For a 75 kg person, that's 120–165 grams per day. During weight loss with a calorie deficit, higher protein (2.0–2.4 g/kg) helps preserve lean muscle mass.

No — carbohydrates are not inherently bad. They are the body's preferred fuel for exercise and cognitive function. Quality matters: complex carbs (oats, brown rice, vegetables, legumes) are preferable to refined carbs (white bread, sugar, candy). Active people generally need more carbohydrates to fuel training.

The ketogenic diet severely restricts carbohydrates (typically 20–50g/day) to induce ketosis — a metabolic state where the body burns fat for fuel. It's effective for some people for weight loss and has medical applications for epilepsy. However, it is highly restrictive, eliminates many healthy foods, and performs similarly to other calorie-controlled diets for long-term weight loss.

Net carbs = total carbs − fiber − half of sugar alcohols. Dietary fiber does not raise blood sugar and has different metabolic effects, so some people (especially on low-carb diets) track only net carbs. For general health and weight management, tracking total carbs is simpler and works well.