Get instant insights into your BMI, daily calorie needs, and personalized macronutrient breakdown
Learn what each measurement means for your health and fitness journey
Body Mass Index is a measure of body fat based on height and weight. It provides a quick assessment of whether you're in a healthy weight range. BMI categories: Underweight (below 18.5), Normal (18.5-24.9), Overweight (25-29.9), Obese (30+).
Macronutrients are the nutrients your body needs in large amounts: protein (builds and repairs tissue), carbohydrates (primary energy source), and fats (hormone production and nutrient absorption). Balancing these is key to reaching your fitness goals.
Total Daily Energy Expenditure is the total number of calories you burn in a day, including your basal metabolic rate and physical activity. Knowing your TDEE helps you determine how many calories to eat for weight loss, maintenance, or muscle gain.
Basal Metabolic Rate is the number of calories your body burns at rest to maintain vital functions like breathing, circulation, and cell production. It represents the minimum energy needed to keep your body functioning if you did nothing all day.
Get your personalized health metrics in four simple steps
Provide your age, gender, height, and weight in your preferred units
Choose your activity level from sedentary to super active
Pick whether you want to lose weight, maintain, or gain muscle
Instantly see your BMI, calories, and macro breakdown
See how different profiles affect your daily calorie and macro needs
Real feedback from users who achieved their fitness goals
This calculator helped me understand my macro needs better than any other tool. I recommend it to all my clients for tracking their nutrition goals.
Finally found a calculator that gives me accurate TDEE numbers. The interface is clean and the results are spot-on for my training needs.
I use this with my clients to show them their baseline metrics. The macro breakdown is particularly helpful for meal planning and education.
Everything you need to know about BMI and macro calculations
BMI is a useful screening tool but has limitations. It doesn't account for muscle mass, bone density, or body composition. Athletes with high muscle mass may have a high BMI but low body fat. Use BMI as one indicator among others, and consult healthcare professionals for a complete health assessment.
TDEE is calculated by multiplying your Basal Metabolic Rate (BMR) by an activity factor. We use the Mifflin-St Jeor equation for BMR, which is considered one of the most accurate formulas. Activity factors range from 1.2 (sedentary) to 1.9 (super active) based on your exercise frequency and intensity.
Macronutrients are protein, carbohydrates, and fats - the three main nutrients your body needs in large amounts. Protein builds and repairs tissue, carbs provide energy, and fats support hormone production and nutrient absorption. Balancing these based on your goals (weight loss, maintenance, or muscle gain) is crucial for optimal results.
This calculator is for informational and educational purposes only. It should not replace professional medical advice, diagnosis, or treatment. Always consult with qualified healthcare providers before making significant changes to your diet or exercise routine, especially if you have existing health conditions.
Our calculations use scientifically validated formulas (Mifflin-St Jeor for BMR) and are accurate for most people. However, individual metabolism varies based on genetics, muscle mass, and other factors. Use these numbers as a starting point and adjust based on your actual results over 2-3 weeks. Track your progress and modify intake as needed.
Yes, macro ratios can be adjusted based on your specific goals. For muscle gain, you might increase protein to 35-40%. For endurance training, higher carbs (45-50%) may be beneficial. For weight loss, some prefer higher protein (35%) to preserve muscle mass. Our default 30/40/30 split is a balanced starting point that works well for most people.