NUTRITIONNutritionHealth Calculator
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Macronutrient Calculator

Calculate your optimal daily intake of protein, carbohydrates, and fat based on your TDEE and fitness goals. Standard ratios are 40/30/30, 30/40/30, or 30/35/35 depending on whether you're cutting, maintaining, or bulking.

Concept Fundamentals
0.7-1g/lb
Protein
45-65% AMDR
Carbs
20-35% AMDR
Fat

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Key values and context for this tool: • Protein: 0.7-1g/lb • Carbs: 45-65% AMDR • Fat: 20-35% AMDR

Key values
0.7-1g/lb
Protein
Key value
45-65% AMDR
Carbs
Key value
20-35% AMDR
Fat
Key value

Ready to run the numbers?

Why: This page explains what the Macro Calculator - Macronutrient calculator does, what to enter, and how to read the results—without repeating the overview above.

How: Enter your values in the calculator fields below, keep units consistent, then run the calculation to see results and any step-by-step work shown on this page.

Run the calculator when you are ready.

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For TDEE calc
Current weight
Leave blank to auto-calc

For informational purposes only — not medical advice. Consult a healthcare professional before acting on results.

Macros (macronutrients) are protein, carbohydrates, and fat. Standard ratios are 40/30/30, 30/40/30, or 30/35/35 depending on whether you're cutting, maintaining, or bulking. Protein: 0.7-1g/lb. Carbs: 45-65% AMDR. Fat: 20-35% AMDR.

0.7-1g/lb
Protein
45-65%
Carbs AMDR
20-35%
Fat AMDR
4-4-9
kcal/g P-C-F

Sources: IOM AMDR, ISSN, Academy of Nutrition and Dietetics.

Key Takeaways

  • • Set protein first based on body weight and goal (0.7-1g per lb)
  • • Fat 20-35% supports hormones and satiety
  • • Carbs fill remaining calories; adjust for preference and performance
  • • 40/30/30 and 30/40/30 are common balanced ratios

Did You Know?

🔢 Protein has highest thermic effect (~20-30% of its calories)
📊 Carbs are primary fuel for high-intensity exercise
💡 Fat is essential for hormone production (testosterone, etc.)
🌍 AMDR = Acceptable Macronutrient Distribution Range (IOM)
📈 1.6-2.2g protein/kg for muscle gain (ISSN)
🎯 Spread protein across 4+ meals for optimal MPS

How Does Macro Calculation Work?

Step 1: Protein

Protein = weight (kg) × multiplier. Cutting: 2.2g/kg. Bulking: 2.0g/kg. Maintenance: 1.6g/kg.

Step 2: Fat

Fat = 20-35% of calories. Cutting: 25%. Bulking: 30%. Fat has 9 kcal/g.

Step 3: Carbs

Carbs = (Total calories - Protein calories - Fat calories) ÷ 4.

Expert Tips

Prioritize protein at each meal (20-40g) for optimal muscle protein synthesis
Time carbs around workouts for performance and recovery
Don't fear fat; include omega-3s for health
Adjust based on preference; sustainable adherence beats perfect ratios

Macro Ratios by Goal

GoalProteinCarbsFat
Cutting30-40%30-40%25-30%
Maintenance25-35%40-50%25-35%
Bulking25-30%40-50%25-35%

Frequently Asked Questions

What are macros?

Macros (macronutrients) are protein, carbohydrates, and fat. They provide calories: protein 4 kcal/g, carbs 4 kcal/g, fat 9 kcal/g. AMDR recommends 10-35% protein, 45-65% carbs, 20-35% fat.

What macro ratio for weight loss?

Common ratios: 40/30/30 (balanced) or 30/40/30 (higher carb). Prioritize protein (0.7-1g per lb) to preserve muscle. Carbs can be reduced for satiety; fat provides essential fatty acids.

What macro ratio for muscle gain?

30/35/35 or 30/40/30 (protein/carbs/fat). Protein 1.6-2.2g per kg. Carbs fuel training; fat supports hormones. A moderate surplus (200-400 kcal) supports lean gain.

How do I calculate macros from calories?

Set protein first (g based on weight and goal). Allocate 20-35% of calories to fat. Remaining calories go to carbs. Example: 2000 kcal, 150g protein (600 kcal), 65g fat (585 kcal), 204g carbs (815 kcal).

What is the 40/30/30 ratio?

40% carbs, 30% protein, 30% fat. A balanced approach for maintenance or moderate activity. Popularized by Zone Diet. Adjust based on preference and performance.

Can I replace medical advice with macro tracking?

No. Macro calculators are educational tools. Those with medical conditions (diabetes, kidney disease) should consult a dietitian. Tracking helps awareness but isn't a substitute for professional guidance.

Key Statistics

4 kcal
Protein (per g)
4 kcal
Carbs (per g)
9 kcal
Fat (per g)
20-40g
Protein/meal

Official Data Sources

IOM Dietary Reference ↗
AMDR guidelines
ISSN Position Stand ↗
Protein for athletes
Academy of Nutrition ↗
Clinical guidelines
USDA Dietary Guidelines ↗
Federal recommendations

⚠️ Disclaimer: This calculator is for educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider or registered dietitian. Not medical advice.

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