Free BMI Calculator — calculate your Body Mass Index instantly using metric or imperial units. See your category and what it means. 🧮
🧮 BMI Calculator
Body Mass Index — a quick check of weight relative to height. Switch between metric and imperial units.
🎯 What is BMI?
BMI (Body Mass Index) is a quick measurement that uses your
height and weight to estimate whether you’re in a healthy weight
range. It’s a useful starting point for thinking about your
overall health.
✨ How to Use the BMI Calculator
- Enter your height (cm or ft/in)
- Enter your weight (kg or lbs)
- Click “Calculate”
- See your BMI number and category instantly!
💡 BMI Categories
- 🟦 Under 18.5 — Underweight
- 🟩 18.5 to 24.9 — Healthy weight
- 🟨 25 to 29.9 — Overweight
- 🟧 30 to 34.9 — Obesity (Class 1)
- 🟥 35 to 39.9 — Obesity (Class 2)
- 🟥 40+ — Obesity (Class 3)
❓ FAQ
Is BMI accurate for everyone?
BMI is a general guide. It doesn’t account for muscle mass, age,
or body composition — athletes often score “overweight” but are
perfectly healthy.
Should I be worried about my BMI?
BMI is just one number. Talk to your doctor for a complete
health assessment.
Can kids use this calculator?
This is designed for adults 20+. Children use age-specific BMI charts.
⚠️ Disclaimer: This tool is for informational purposes only and
is not medical advice. Always consult a healthcare professional.