Macro Calculator
Break your daily calorie target into protein, carb, and fat grams based on your goal and diet style.
What are macronutrients?
Macronutrients — protein, carbohydrates, and fat — are the three nutrients that supply your body with calories. Protein and carbs each provide 4 calories per gram, while fat provides 9 calories per gram. While total calorie intake determines whether you gain, lose, or maintain weight, how those calories are split between macros can affect muscle retention, satiety, energy levels, and training performance. If you haven't set a calorie target yet, our TDEE calculator and calorie deficit calculator can help you find one.
How this calculator splits your macros
This calculator applies standard macro splits based on diet style: a Balanced split (30% protein / 40% carb / 30% fat), a Low-Carb split (35% protein / 20% carb / 45% fat), and a High-Protein split (40% protein / 30% carb / 30% fat). If your goal is to build muscle, we add 5 percentage points to your protein target to support muscle repair and growth, adjusting the other macros proportionally. Grams are then calculated using 4 calories per gram for protein and carbs, and 9 calories per gram for fat.
Adjusting macros to your goals
There's no single "correct" macro split — it depends on your goals, training style, and personal preference. People cutting body fat often favor higher protein to preserve muscle, while endurance athletes may want more carbs for fuel. Use this calculator as a starting point and adjust based on how your body responds. This tool provides an estimate only and is not medical or nutritional advice; consult a registered dietitian for a personalized plan.
Frequently Asked Questions
What are macros and why do they matter?
Macros (macronutrients) are protein, carbohydrates, and fat — the nutrients that provide calories. While total calories drive weight change, the balance of macros affects things like muscle preservation, hunger levels, and workout performance.
How many calories are in a gram of protein, carbs, and fat?
Protein and carbohydrates each provide 4 calories per gram, while fat provides 9 calories per gram. This calculator uses those values to convert your macro percentages into grams.
How do I find my daily calorie target before calculating macros?
Start with your Total Daily Energy Expenditure (TDEE) using our TDEE calculator, then adjust up or down depending on whether your goal is to gain, maintain, or lose weight. Our calorie deficit calculator can help with the weight-loss version of that math.
Why does building muscle increase my protein target?
Muscle repair and growth require adequate protein intake to supply amino acids for muscle protein synthesis. This calculator adds 5 percentage points to your protein allocation when your goal is set to "Build Muscle" to better support that process.
What's the difference between the Balanced, Low-Carb, and High-Protein splits?
The Balanced split (30/40/30) mirrors general healthy-eating guidance. Low-Carb (35/20/45) reduces carbohydrate intake in favor of fat, often used for lower-carb or keto-adjacent approaches. High-Protein (40/30/30) prioritizes protein, popular for those focused on muscle retention or satiety.
Do I need to hit my macros exactly every day?
No — macros are a target, not a strict requirement. Staying within a reasonable range (roughly ±5-10g) most days is generally sufficient for the intended benefits, and weekly averages matter more than any single day.
Is a low-carb diet better for weight loss than a balanced macro split?
Research generally shows that total calorie intake matters more for weight loss than the specific macro split, as long as protein is adequate. Low-carb diets can help some people manage hunger and adherence, but they aren't inherently superior for fat loss.
Is this macro calculator medical or nutritional advice?
No. This tool provides a general estimate based on common macro-splitting guidelines and is not a substitute for personalized advice from a registered dietitian or healthcare provider, especially if you have specific medical or dietary needs.