Macronutrient (Macros) Calculator
Split your daily calories into protein, carbohydrates and fat. Set your macros for balanced eating, low-carb, high-protein or keto goals.
Use our calorie calculator if you're unsure
What are macronutrients?
Macronutrients, or macros, are the three nutrients your body needs in large amounts to function: protein, carbohydrates and fat. Each provides energy — protein and carbohydrates supply 4 calories per gram, while fat supplies 9. Counting macros means tracking not just how many calories you eat, but how those calories are divided between the three. Many people find that paying attention to their macro balance, rather than calories alone, helps them reach goals like building muscle, losing fat or improving energy.
What each macro does
Protein builds and repairs tissue, supports muscle and keeps you feeling full. Carbohydrates are your body's main and most readily available energy source, fuelling your brain and muscles, especially during exercise. Fat is essential for hormone production, absorbing certain vitamins, and protecting your organs. All three matter — very low intake of any one can affect your health, which is why balanced macro targets are usually healthier than extreme restriction of a single macro.
Choosing a macro split
There is no single best macro split; the right one depends on your goals, preferences and activity. A balanced split works well for general health. Higher-protein splits suit people building muscle or trying to stay full while losing fat. Lower-carb and ketogenic splits shift the body toward using fat for fuel and suit some people for weight management, though they are more restrictive. This calculator lets you compare common splits so you can pick one that fits your lifestyle.
Making macros work in practice
To hit your macros, it helps to know roughly where they come from: lean meats, fish, eggs, dairy and legumes for protein; grains, fruits, vegetables and starches for carbohydrates; and oils, nuts, seeds, avocado and fatty fish for fat. A food-tracking app makes counting much easier when you start. Remember these are targets, not rigid rules — consistency over time matters far more than hitting exact numbers every single day. Adjust based on your results and how you feel.
Frequently Asked Questions
There is no universally best split; it depends on your goals. A balanced split (around 30% protein, 40% carbs, 30% fat) suits general health. Higher protein helps with muscle building and satiety, while lower-carb or keto splits suit some people for weight management. This calculator lets you compare options.
Related Tools
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Protein Intake Calculator
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BMR Calculator
Calculate your Basal Metabolic Rate (BMR) — the number of calories your body burns at complete rest to keep you alive
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Sources & References
- 1.U.S. Dietary Guidelines. Acceptable Macronutrient Distribution Ranges.
- 2.Academy of Nutrition and Dietetics. How Much of Each Macronutrient Should You Eat?
- 3.International Society of Sports Nutrition. Position stand on diets and body composition.
LifeCheckIQ content is based on peer-reviewed research, recognised clinical guidelines, and authoritative medical sources, and is reviewed by Deborah Adotso, General Nurse, for clinical accuracy.
Medical Disclaimer: This tool is for informational and educational purposes only. Results are not a medical diagnosis. Always consult a qualified healthcare professional for medical advice, diagnosis, or treatment. In an emergency, call your local emergency number or visit the nearest hospital immediately.