Height

Weight (lbs)

lbs

Your Body Mass Index

23.0 Normal Weight

Healthy Weight Range 129 – 174 lbs

<18.5 Underweight 18.5–24.9 Normal 25–29.9 Overweight ≥30 Obese

YOU

Your BMI is in the optimal healthy range.

📊 WHO International BMI Classification

Category	BMI Range	Health Risk
Underweight	< 18.5	Nutritional deficiency risk
Normal Weight	18.5 – 24.9	Lowest disease risk
Overweight	25.0 – 29.9	Moderate cardiovascular risk
Obese (Class I & II)	≥ 30.0	High cardiovascular & metabolic risk

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BMI Calculator (WHO & CDC Standard)

🧮 Calculators

Calculate your Body Mass Index (BMI), visual health classification gauge, and ideal target weight range.

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Frequently Asked Questions

Quick answers about controls, features, accuracy, and local browser saving.

How is Body Mass Index (BMI) calculated?

BMI is calculated using standard WHO and CDC formulas: In Metric, BMI = weight (kg) / [height (m)]². In US Imperial units, BMI = 703 × weight (lbs) / [height (inches)]².

What are the official BMI weight classifications?

According to the World Health Organization (WHO):
• Underweight: < 18.5
• Normal / Healthy Weight: 18.5 – 24.9
• Overweight: 25.0 – 29.9
• Obesity: 30.0 or greater.

How is the healthy ideal weight range determined?

The ideal weight range corresponds to the weights that produce a BMI between 18.5 and 24.9 for your specific height: Min Weight = 18.5 × height² and Max Weight = 24.9 × height².

Is BMI accurate for athletes and bodybuilders?

BMI is an epidemiological screening tool rather than a diagnostic measurement of body fat percentage. Athletes with substantial muscle mass may register as "Overweight" or "Obese" despite having very low body fat.

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