🥩 Macro Calculator

Calculate your ideal daily protein, carbs, and fat targets based on your body and goals.

What Are Macros and Why Do They Matter?

Macronutrients — or "macros" — are the three main categories of nutrients your body uses for energy: protein, carbohydrates, and fat. Alcohol is sometimes counted as a fourth macro. Each has a specific caloric value:

  • Protein — 4 calories per gram. Builds and repairs muscle tissue, keeps you full longer, and supports immune function. Especially important if you exercise regularly.
  • Carbohydrates — 4 calories per gram. Your body's preferred fuel source for high-intensity activity and brain function. Includes sugars, starches, and fiber.
  • Fat — 9 calories per gram. Essential for hormone production, vitamin absorption, and cell membrane health. Higher calorie density means smaller portions matter more.

Tracking macros — rather than just total calories — gives you a more precise way to reach body composition goals. Two people can eat the same number of calories but get very different results depending on how those calories are split between protein, carbs, and fat.

How This Calculator Works

Your daily calorie target is calculated using the Mifflin-St Jeor equation (the most validated formula for estimating BMR), then adjusted for your activity level. Your macro targets are then derived from that calorie number based on your goal: cutting, maintaining, or building muscle.

Common Macro Split Ratios

GoalProteinCarbsFat
Weight Loss40%30%30%
Maintenance30%40%30%
Muscle Gain30%50%20%
Low Carb / Keto25%5%70%
Endurance Athlete20%60%20%

FAQs

What are macros?
Macros are protein (4 cal/g), carbohydrates (4 cal/g), and fat (9 cal/g). Tracking them lets you hit specific nutrition targets for your health and fitness goals.
How much protein do I need per day?
General health: 0.8g/kg. Muscle building: 1.6–2.2g/kg (0.7–1g/lb). Weight loss with muscle preservation: 1.8–2.4g/kg.
What macro split is best for weight loss?
40% protein / 30% carbs / 30% fat is popular for fat loss. High protein preserves muscle in a calorie deficit. Some prefer higher carbs (40/40/20) or ketogenic (5/25/70) approaches.
What is TDEE?
TDEE (Total Daily Energy Expenditure) is all calories burned per day including exercise. Your macros are calculated from your TDEE adjusted by your goal (cut, maintain, or bulk).

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Calorie CalculatorBMR CalculatorBMI CalculatorBody Fat CalculatorIdeal Weight Calculator