Your Body Mass Index (BMI) is a quick screening number that compares your weight to your height. It won’t tell you your body fat percentage or muscle mass, but it’s a fast, free way to see whether your weight falls in a range associated with lower health risks. Use the calculator below to get your BMI, your healthy weight range, and a personalized suggestion for what to do next.

BMI Calculator

Your BMI:——
Healthy Weight Range For Your Height—
Advice To Improve

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BMI Categories at a Glance

These are the standard adult BMI categories used by health organizations worldwide, broken down into finer levels so you can see exactly where your result falls. Your result above is measured against this same scale.

BMI Range Category Health Risk
Below 16.0 Underweight (Severe) High risk of nutritional deficiency and weakened immune function
16.0 – 18.4 Underweight (Mild) Increased risk of low energy reserves and reduced bone density
18.5 – 21.6 Normal (Lower Range) Lowest risk associated with body weight
21.7 – 24.9 Normal (Upper Range) Low risk, still within the healthy range
25.0 – 27.4 Overweight (Mild) Moderately increased risk of heart disease and type 2 diabetes
27.5 – 29.9 Overweight (Higher) Higher risk of elevated blood pressure and joint strain
30.0 – 34.9 Obese (Class I) High risk of heart disease, type 2 diabetes, and joint problems
35.0 and above Obese (Class II+) Very high risk of serious health complications

Frequently Asked Questions

Is BMI accurate for everyone? Not entirely. BMI does not distinguish between muscle and fat, so muscular individuals can register as overweight despite low body fat. It works best as a general population screening tool rather than an individual diagnosis.

What is considered a healthy BMI range? 18.5 to 24.9 is the standard healthy range used by most health organizations, though individual context always matters.

Can BMI be misleading for athletes? Yes. Athletes and heavily muscled individuals often have a higher BMI due to muscle mass rather than excess fat, so the number alone can overstate health risk for this group.

How often should I check my BMI? Checking every few months is plenty for most people. BMI changes slowly, and checking too often adds little useful information.

Does BMI differ by age or gender? The standard adult categories used here apply broadly to adults 18 and older regardless of gender, though some health providers use adjusted references for older adults or specific populations.

Disclaimer: BMI is a general screening tool, not a diagnosis. It does not account for muscle mass, bone density, or body composition. Talk to a healthcare provider for a full picture of your health.