Macro Calculator

Break down your daily calorie goal into precise grams of protein, carbs, and fats.

Don't know? Calculate calories first

Your Daily Nutrients

Protein -- grams
Carbs -- grams
Fats -- grams

Nutritional Values Used:

  • Protein: 4 calories per gram
  • Carbohydrate: 4 calories per gram
  • Fats: 9 calories per gram

Fuel your body right

Enter your daily calorie target and choose a diet strategy to see exactly how much protein, fat, and carbs you need each day.

Macro Calculator – Break Down Calories into Protein, Carbs & Fats

Convert your daily calorie goals into precise grams of protein, carbohydrates, and fats with our free online Macro Calculator. No software installation, no registration, and no data storage. Simply enter your details and get instant, personalized macronutrient targets.

Whether you're following a ketogenic diet, building muscle, or optimizing athletic performance, this tool calculates your ideal macro split based on your goals, activity level, and body composition – taking the guesswork out of nutrition planning.

Macro Calculator Online Tool
Features of Macro Calculator

Why Use Our Macro Calculator?

  • 100% Free – No hidden charges or premium tiers
  • Privacy First – Your personal data never leaves your browser; nothing is stored online
  • Goal-Based Splits – Different macro ratios for weight loss, muscle gain, or maintenance
  • Customizable Ratios – Adjust protein, carb, and fat percentages to match your dietary preferences
  • Diet-Specific Presets – Keto, Zone Diet, Mediterranean, and low-carb options available
  • Gram Breakdown – See exactly how many grams of each macronutrient to eat daily

How to Calculate Your Macros

  1. Enter your age, gender, height, and weight
  2. Select your activity level from sedentary to extra active
  3. Choose your primary goal: weight loss, muscle gain, or maintenance
  4. Select a diet preset or customize your own macro ratios
  5. Optional: Enter body fat percentage for more accurate calculations
  6. Click Calculate Macros to see your personalized protein, carb, and fat targets

No technical skills required – the process takes just seconds.

How to calculate macros steps

Practical Use Cases for Our Macro Calculator

Every day, thousands of fitness enthusiasts, athletes, and health-conscious individuals rely on our tool to optimize their nutrition. Here are just a few ways macro tracking can help you reach your goals:

Ketogenic Diet

Get precise fat, moderate protein, and minimal carb targets for ketosis. Our keto preset follows the standard 75% fat, 20% protein, 5% carb ratio.

Muscle Building

Optimize protein intake for muscle protein synthesis while ensuring enough carbs for energy and fats for hormone production during bulking phases.

Weight Loss

Create a sustainable calorie deficit while maintaining high protein to preserve muscle mass and keep you feeling full and satisfied.

Athletic Performance

Fine-tune carb intake around training sessions for optimal energy, protein for recovery, and fats for endurance activities and overall health.

Pro Tips & Best Practices

Master your macro tracking with these expert tips:

  • Protein is Non-Negotiable: Aim for at least 0.7-1.0 grams per pound of body weight (1.6-2.2 g/kg) whether you're cutting or bulking. It preserves muscle and keeps you full.
  • Adjust Based on Results: Your calculated macros are a starting point. Track your progress for 2 weeks and adjust fats/carbs up or down based on energy levels and results.
  • Focus on Food Quality: While hitting your numbers matters, getting macros from whole foods (lean meats, vegetables, healthy fats) is better than processed alternatives.
Macro calculator tips and best practices

Core Benefits of Using a Macro Calculator

  • Precision Nutrition: Move beyond vague "eat less" advice to exact gram targets tailored to your body and goals.
  • Flexible Dieting: No foods are off-limits. As long as you hit your numbers, you can enjoy the foods you love in moderation.
  • Better Results: Proper macro balance ensures you lose fat instead of muscle, or gain muscle without excess fat.
  • Educational: Learn the nutritional composition of foods and build lasting healthy eating habits.

Complete Privacy – Your Data Stays on Your Device

Unlike online calculators that may track or store your personal information, Sellooo's Macro Calculator works entirely in your browser using JavaScript. Your age, weight, height, and all personal data never leave your device, aren't stored anywhere, and remain completely confidential. No servers, no logs, no tracking.

Frequently Asked Questions

Find detailed answers to common questions about macronutrients, macro tracking, and nutrition planning.

Yes, Sellooo's Macro Calculator is completely free. There are no paywalls, no hidden subscription fees, and no "pro" features you have to unlock. We believe essential nutrition tools should be accessible to everyone without cost barriers.

Macronutrients are the nutrients your body needs in large amounts for energy and function: Protein (4 calories per gram) for muscle repair and growth, Carbohydrates (4 calories per gram) for energy, and Fats (9 calories per gram) for hormone production and nutrient absorption. Tracking macros gives you more control than counting calories alone.

For most active individuals, aim for 0.7-1.0 grams per pound of body weight (1.6-2.2 g/kg). Sedentary individuals need less (0.4-0.5 g/lb), while bodybuilders and athletes may benefit from up to 1.2 g/lb. Our calculator adjusts protein based on your goals – higher for muscle gain and weight loss to preserve muscle mass.

A common starting point for weight loss is 40% carbohydrates, 30% protein, 30% fat. However, the "best" ratio varies by individual. Higher protein (30-35%) helps preserve muscle and increases satiety. Some prefer lower carb (20-30%) if they're insulin sensitive. Our calculator lets you customize based on your preferences.

A standard ketogenic diet typically follows 75% fat, 20% protein, and 5% carbohydrates. This usually means keeping carbs under 20-50 grams per day. Our keto preset automatically applies these ratios, but you can adjust if you prefer a modified approach like targeted keto for athletes.

Use apps like MyFitnessPal, Cronometer, or Lose It! to log your food. Weigh portions with a food scale for accuracy (especially for fats and proteins). Start by tracking for a few weeks to understand portion sizes – you'll get better at estimating over time without needing to weigh everything forever.

Your privacy is our highest priority. All calculations run strictly locally inside your web browser using JavaScript. This means your age, weight, height, and all personal data is never transmitted to our servers, stored anywhere, or logged. You can use our calculator with complete confidence.

Yes! Our tool is entirely web-based and fully responsive. It works flawlessly on any modern browser on Windows, macOS, Linux, iOS (iPhone/iPad), and Android devices. No app installation required – just open your browser and calculate your macros instantly.

Explore More Nutrition Tools

Looking for more nutrition insights? Check out our Calorie & TDEE Calculator or BMR Calculator to complete your nutrition toolkit at sellooo.com.