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Macro Calculator

Calculate your daily protein, carb, and fat targets based on your goals and activity level.

Macro Calculator

Understanding Macronutrients

Macronutrients — protein, carbohydrates, and fat — are the three building blocks of your diet. Each macro plays a unique role in your body: protein builds and repairs tissue, carbohydrates fuel activity and brain function, and fat supports hormones and nutrient absorption. Getting the right balance of macros is key to reaching your fitness goals, whether that's building muscle, losing fat, or improving performance.

ApproachProteinCarbsFat
Balanced30%35%35%
High Protein40%30%30%
Low Carb30%20%50%
Keto20%5%75%

The Role of Each Macro

Protein (4 cal/g) is essential for muscle repair, immune function, and enzyme production. Active individuals should aim for 0.7-1.0 g per pound of body weight. Carbohydrates (4 cal/g) are your body's primary fuel source, especially during intense exercise. They also regulate mood and brain function. Fat (9 cal/g) supports hormone production (including testosterone), absorbs fat-soluble vitamins (A, D, E, K), and provides sustained energy.

Finding Your Personal Split

Start with a general guideline from the table above, then adjust based on how you feel, perform, and recover. Track your intake for 2-3 weeks before making changes. If you're always hungry, try increasing protein or fat. If workouts suffer, add more carbs. The best macro split is one you can stick to consistently.

Disclaimer: This calculator is for informational purposes only and is not a substitute for professional nutritional advice. Consult a registered dietitian for personalized dietary guidance.

Frequently Asked Questions

What are macronutrients?
Macronutrients (macros) are the three main categories of nutrients your body needs in large amounts: protein, carbohydrates, and fat. Each provides energy (calories) and serves distinct functions. Protein provides 4 calories per gram and builds/repairs tissue. Carbohydrates provide 4 calories per gram and are your body's preferred energy source. Fat provides 9 calories per gram and supports hormone production, nutrient absorption, and cell structure.
How do I choose the right macro split?
Your ideal macro split depends on your goals. For general fitness, a balanced split of 30% protein, 35% carbs, and 35% fat works well. For muscle building, increase protein to 35-40% and keep carbs high to fuel training. For fat loss, a higher protein intake (35-40%) helps preserve muscle while in a calorie deficit. For keto, fat rises to 70-75% with carbs dropping to 5-10%. Start with a general guideline and adjust based on how you feel and perform.
How much protein do I really need?
Research suggests 0.7-1.0 grams of protein per pound of body weight (1.6-2.2 g/kg) is optimal for people who exercise regularly. This range supports muscle protein synthesis, recovery, and satiety. Sedentary adults need less — about 0.36 g per pound (0.8 g/kg). If you're in a calorie deficit, aim for the higher end of the range to minimize muscle loss.
What is IIFYM (If It Fits Your Macros)?
IIFYM, also called flexible dieting, is an approach where you focus on hitting your daily macro targets rather than eating specific "clean" foods. The idea is that body composition is primarily driven by total calorie and macronutrient intake, not individual food choices. While this is largely true for body composition, food quality still matters for overall health, micronutrient intake, and satiety. A practical approach is to get 80% of your intake from whole foods and use the remaining 20% flexibly.

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