Macro Calculator

1. Calculate your TDEE from body stats or enter it manually.
2. Select your weight goal: lose, maintain, or gain.
3. View your target calories based on your goal.
4. Compare four macro presets with visual breakdowns.
5. See exact grams of protein, carbs, and fat for each preset.
6. Choose the split that aligns with your diet and training.

What Are Macronutrients?

Macronutrients (commonly called "macros") are the three primary nutrients your body requires in large quantities: protein, carbohydrates, and fat. Each macronutrient serves a distinct role. Protein builds and repairs muscle tissue, supports immune function, and produces enzymes and hormones. Carbohydrates are your body's preferred energy source, fueling brain function, physical activity, and organ systems. Fat supports hormone production, absorbs fat-soluble vitamins (A, D, E, K), protects organs, and provides long-lasting energy. While total calorie intake determines whether you gain or lose weight, your macro ratio influences body composition, energy levels, athletic performance, and satiety. Tracking macros allows you to optimize these factors beyond what simple calorie counting can achieve.

How Macro Calculations Work

Macro calculations begin with your total daily calorie target, which is derived from your TDEE adjusted for your weight goal. A standard adjustment is minus 500 calories per day for weight loss or plus 500 calories per day for weight gain. Once you have your calorie target, it is divided among the three macronutrients according to your chosen ratio. To convert from calories to grams, divide protein and carbohydrate calories by 4 (each gram provides 4 calories) and divide fat calories by 9 (each gram provides 9 calories). For example, on a 2,000-calorie balanced diet using a 40/30/30 split (carbs/protein/fat): 800 calories from carbs equals 200g, 600 calories from protein equals 150g, and 600 calories from fat equals approximately 67g.

This calculator uses the Mifflin-St Jeor equation to estimate your TDEE when calculating from body stats. You can also enter your TDEE directly if you already know it from our TDEE Calculator or another source.

Common Use Cases

• Optimizing body composition during a fat loss or muscle building phase
• Following a specific diet protocol such as keto, low-carb, or high-protein
• Improving athletic performance and workout recovery through targeted nutrition
• Managing hunger and energy levels by adjusting the ratio of protein, carbs, and fat
• Transitioning from simple calorie counting to a more detailed nutrition approach
• Planning weekly meal prep around specific gram targets for each macronutrient

Macronutrient Ratios for Different Goals

Balanced (40% carbs, 30% protein, 30% fat): This is a well-rounded split suitable for most people focused on general health and moderate fitness. It provides enough protein for muscle maintenance, sufficient carbs for energy, and adequate fat for hormonal health.

Low Carb (25% carbs, 45% protein, 30% fat): Reducing carbohydrates and increasing protein can help with appetite control and fat loss while preserving lean muscle mass. This approach works well for people who are less active or who respond poorly to high-carb diets.

High Protein (30% carbs, 45% protein, 25% fat): Prioritizing protein is ideal during aggressive fat loss phases or for strength athletes aiming to maximize muscle retention. Research suggests 0.7 to 1.0 grams of protein per pound of body weight for active individuals.

Keto (5% carbs, 30% protein, 65% fat): The ketogenic diet restricts carbohydrates to roughly 20 to 50 grams per day, forcing the body into ketosis, a metabolic state where fat becomes the primary fuel source. This split requires careful planning to maintain adequate nutrition. Consult a healthcare professional before starting a ketogenic diet, especially if you have diabetes or kidney conditions.

Related Health Tools

Determine your daily calorie needs with the Calorie Calculator, explore your energy expenditure at every activity level with the TDEE Calculator, or check your weight classification with the BMI Calculator and Body Fat Calculator.