BMI Calculator
Body Mass Index

Find your BMI instantly. See your health category and ideal weight range — free, private, no sign-up needed.

⚖️ Metric & Imperial 📊 BMI Scale 🎯 Ideal Weight Range 🔒 100% Private ⚡ Instant Results
Your Measurements
cm
kg
yrs
Your BMI Result
— Enter values above
Your BMI —
Category —
Height —
Weight —
BMI Scale
Underweight
<18.5 Normal
18.5–24.9 Overweight
25–29.9 Obese
≥30
Underweight (<18.5) Normal (18.5–24.9) Overweight (25–29.9) Obese (≥30)
Ideal Weight Range for your height
—
Healthy BMI range
18.5 – 24.9

📐 BMI Formula

BMI = Weight (kg) ÷ Height² (m²). For imperial: BMI = 703 × Weight (lbs) ÷ Height² (in²). Same formula used by WHO and all major health organisations.

⚠️ BMI Limitations

BMI does not account for muscle mass, bone density, or fat distribution. Athletes may show high BMI despite low body fat. Use BMI as a screening guide, not a diagnosis.

🌍 WHO BMI Categories

Underweight: below 18.5 · Normal: 18.5–24.9 · Overweight: 25–29.9 · Obese Class I: 30–34.9 · Obese Class II: 35–39.9 · Obese Class III: 40+

❤️ Beyond BMI

Waist circumference, blood pressure, cholesterol, blood sugar, and physical activity are also key health indicators. Consult a doctor for a complete health assessment.