What Is a Healthy BMI? (Chart + How to Read It)

BMI (Body Mass Index) is a quick screening number that compares your weight to your height. It won't tell the whole story, but it's a useful starting point. Here's what the numbers mean and how to read yours.

Find your number first

Enter your height and weight in the BMI Calculator (metric or imperial) to get your BMI instantly, then match it to the categories below.

The standard BMI categories (adults)

• Under 18.5 — underweight
• 18.5 – 24.9 — healthy weight
• 25.0 – 29.9 — overweight
• 30.0 and above — obesity

So a “healthy” BMI for most adults falls between 18.5 and 24.9.

How BMI is calculated

BMI = weight (kg) ÷ height (m)². In imperial units it's 703 × weight (lb) ÷ height (in)². The calculator handles both for you — no math needed.

Where BMI falls short

BMI is a rough screen, not a diagnosis. It doesn't account for:

• Muscle vs. fat — athletes can read “overweight” despite low body fat.
• Fat distribution — where you carry weight matters for health risk.
• Age, sex, and ethnicity — healthy ranges can differ.
• Children and teens — they use age- and sex-specific percentiles, not adult ranges.

This is general information, not medical advice. For guidance about your weight and health, talk to a doctor.

Related tools

See your ideal weight range, estimate your daily calorie needs (BMR), or plan intake with the Calorie Calculator.

FAQ

What is a healthy BMI?

For most adults, a BMI between 18.5 and 24.9 is considered healthy.

Is BMI accurate?

It's a useful screening tool but imperfect — it can misjudge very muscular people and doesn't measure body fat directly.

Does BMI work for children?

No — children and teens are assessed with age- and sex-specific percentile charts, not the adult ranges.