BMI Explained: What Your Number Really Means

BMI (Body Mass Index) is a quick screening number that relates your weight to your height. Here's how to read it.

How BMI is calculated

BMI = weight (kg) ÷ height (m)². For example, 70 kg at 1.75 m → 70 ÷ 3.06 ≈ 22.9.

What the ranges mean (WHO)

• Below 18.5 — underweight
• 18.5–24.9 — normal
• 25–29.9 — overweight
• 30 and above — obese

The limits of BMI

BMI doesn't distinguish muscle from fat, so very muscular people can read as "overweight." It's a rough guide, not a diagnosis — always talk to a doctor for a full picture.

Check yours with our BMI Calculator, and estimate daily energy needs with the Calorie Calculator.