Macro Calculator
Get personalized macronutrient targets for cutting, maintaining, or bulking. Adjusts protein, carbs, and fat based on your TDEE and goal.
How to Track Macronutrients for Body Composition
Macronutrients, or macros, are the nutritional building blocks of your diet: proteins, carbohydrates, and fats. While total calorie intake determines whether you lose or gain weight, your macro distribution dictates whether that weight change comes from fat or muscle.
Each macronutrient has a specific role and caloric value: protein provides 4 calories per gram and preserves muscle mass; carbohydrates provide 4 calories per gram and fuel workouts; fats provide 9 calories per gram and support hormone health.
Customizing your macronutrient ratios allows you to target specific fitness goals. For example, a ketogenic diet requires high fat and minimal carbs, while muscle growth requires elevated protein and moderate carbohydrates. Our calculator makes it easy to set and track these targets.
About this Calculator
Methodology & Formulas: This Macro calculator uses standard physiological formulas and evidence-based guidelines to provide accurate estimates.
Reviewed by: Dr. Rekha Kumar, M.D., M.S., Lead Medical Reviewer
Last Updated: August 2026
Sources & Citations: Guidelines from the NIH and CDC were consulted in the creation of this tool.
Disclaimer: This tool is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider.
Frequently Asked Questions
Q: What is the best macro ratio for weight loss?
A common macro split for fat loss is 30% to 40% protein, 30% to 40% carbohydrates, and 20% to 30% fats. Hitting your protein target is the most important factor.
Q: How many calories are in macros?
Protein and carbohydrates contain 4 calories per gram, while fats contain 9 calories per gram.
Scientific References & Clinical Guidelines
- CDC Healthy Weight Guidelines - Centers for Disease Control and Prevention
- NIH National Heart, Lung, and Blood Institute (NHLBI) Obesity Guidelines
- PubMed studies on rate of fat mass vs. lean mass loss