BMI · BMR · TDEE Calculator
Three evidence-based numbers to anchor your nutrition plan
Body Mass Index (BMI) screens weight status, Basal Metabolic Rate (BMR) estimates calories burned at rest, and Total Daily Energy Expenditure (TDEE) adjusts BMR for your activity level. Enter your numbers below — the calculator updates instantly.
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Your Numbers
How to use these numbers
BMI is a screening tool — it does not distinguish fat from muscle. Athletes often register as overweight or obese despite low body fat. Pair BMI with waist circumference and body composition for a fuller picture.
BMR is the calories your body burns at complete rest. It accounts for 60–75% of TDEE for most people. BMR decreases with age and loss of lean mass, and increases with muscle and certain medical conditions.
TDEE is your maintenance calories — eat this to stay at your current weight. To lose weight, subtract 250–500 kcal; to gain weight, add 250–500 kcal. Aim for 0.5–1% body weight change per week for sustainable results.
Formulas Used
- BMI = weight (kg) ÷ height (m)²
- BMR (male) = 10 × weight + 6.25 × height − 5 × age + 5
- BMR (female) = 10 × weight + 6.25 × height − 5 × age − 161
- TDEE = BMR × activity factor (1.2 / 1.375 / 1.55 / 1.725 / 1.9)
BMR uses the Mifflin-St Jeor equation, which is recommended by the American Dietetic Association as the most accurate for healthy adults. BMI uses the WHO international classification for adults.
This calculator is for educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Consult a registered dietitian or physician for personalized recommendations.