BMI Calculator

What Is BMI?

Body Mass Index (BMI) is a quick screening tool that estimates body fat using just your weight and height. It categorizes adults into weight ranges that may indicate health risks.

The formula: BMI = weight (kg) ÷ height² (m²)

BMI Categories

BMI Range	Category
Below 18.5	Underweight
18.5 – 24.9	Normal weight
25 – 29.9	Overweight
30 or higher	Obese

What BMI Doesn't Tell You

BMI can't tell muscle from fat. A bodybuilder might score "overweight" despite having very little body fat. It also doesn't capture where fat is stored — belly fat matters more than hip fat for health risk.

For a fuller picture, pair BMI with:

• Body fat percentage — measures actual fat mass
• TDEE — your daily calorie burn

When to See a Doctor

If your BMI is outside the normal range, or if you're unsure about your results, talk to a healthcare provider. They can consider your full health picture. This calculator is for informational purposes only — it's not medical advice.