tools.macros_calculator.label_meal_split
ℹ️ About this tool
Calculate Your Daily Macros for Free Online
The Macros Calculator gives you personalized daily targets for protein, carbohydrates, and fat based on your body stats and fitness goal. It uses the Mifflin-St Jeor equation to estimate your Total Daily Energy Expenditure and then distributes calories across macronutrients in ratios optimized for fat loss, maintenance, or muscle gain.
How to Use the Macros Calculator
Select your gender, then enter your weight, height, and age. Choose your activity level from sedentary to extremely active. Pick your fitness goal — lose fat, maintain weight, or build muscle. Click Calculate Macros to instantly see your TDEE, total daily calories, and a breakdown of protein, carbohydrates, and fat in both grams and calories. Copy the results for easy reference.
Why Use This Macros Calculator
This calculator is completely free, requires no signup, and produces results instantly. It uses the scientifically validated Mifflin-St Jeor equation for accurate BMR estimation. All calculations run in your browser so your personal health data is never sent to any server. The clear breakdown makes it easy to plan meals and track nutrition.
Popular Use Cases
Gym-goers calculate daily protein needs for muscle building programs. People starting a weight loss journey find their calorie deficit and macro split. Athletes adjust macronutrient ratios during training and competition phases. Nutritionists and personal trainers use it as a quick reference tool when advising clients on dietary plans.
Frequently Asked Questions
How are macros calculated?
The calculator first estimates your Basal Metabolic Rate using the Mifflin-St Jeor equation, which factors in your gender, weight, height, and age. It then multiplies your BMR by an activity factor to determine your Total Daily Energy Expenditure. Finally, it distributes your calories across protein, carbohydrates, and fat based on your selected fitness goal, whether that is losing fat, maintaining weight, or building muscle.
What activity level should I choose?
Choose Sedentary if you have a desk job and do little exercise. Lightly Active fits someone who exercises one to three times per week. Moderately Active suits three to five workouts per week. Very Active is for intense exercise six to seven days per week. Extremely Active applies to athletes or people with physically demanding jobs who also train daily.
How much protein do I really need?
For most people aiming to build or maintain muscle, the widely recommended range is 1.6 to 2.2 grams of protein per kilogram of body weight per day. This calculator adjusts the protein ratio based on your goal — higher for muscle gain and fat loss to preserve lean mass, and moderate for weight maintenance. Individual needs may vary based on training intensity and overall diet composition.
Is my personal health data stored anywhere?
No. All calculations happen entirely in your browser. Your weight, height, age, and other inputs are never sent to any server or stored in any database.
How accurate is the Mifflin-St Jeor equation?
The Mifflin-St Jeor equation is considered one of the most accurate formulas for estimating basal metabolic rate and is widely used by nutritionists and healthcare professionals. Individual results may vary based on factors like body composition and metabolism.
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