Health Calculators
BMI and daily calorie needs — two essential health calculators using WHO and Mifflin-St Jeor standards.
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Frequently Asked Questions
Are these health calculators free and private?↓
Yes. The BMI and calorie (TDEE) calculators are free with no signup, and every calculation runs in your browser. Your height, weight and age are never sent to or stored on a server.
How is BMI calculated?↓
BMI is your weight in kilograms divided by your height in meters squared (kg/m²). For adults, the WHO categories are: under 18.5 underweight, 18.5–24.9 normal weight, 25–29.9 overweight, and 30 or higher obese.
What is the difference between BMR and TDEE?↓
BMR (basal metabolic rate) is the calories your body burns at complete rest. TDEE (total daily energy expenditure) is BMR multiplied by an activity factor, from 1.2 for sedentary to 1.9 for extra active, and estimates the calories you burn in a typical day. The calorie calculator estimates BMR with the Mifflin-St Jeor equation.
Can I use pounds and feet instead of kilograms and centimeters?↓
Yes. Both calculators support metric (cm and kg) and imperial (feet, inches and pounds) units.
How accurate are BMI and calorie estimates?↓
They are good population-level estimates, not diagnoses. BMI does not distinguish muscle from fat, and real calorie needs can differ from TDEE formulas by 10% or more. For medical or dietary decisions, talk to a doctor or registered dietitian.
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