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Free BMI calculator for men, women, and adults. Calculate your Body Mass Index instantly with our accurate, privacy-focused tool. Calculate your body mass index (BMI) based on your height and weight, and learn about your health risks and weight goals. Find out how BMI measures your weight relative to your height, and what it can't tell you about your body fat, age, sex, and more. Calculate your BMI and see your category, risk level, and optimal weight range with this online tool. Learn about the formula, categories, and health effects of BMI, as well as the BMI Prime index . Calculate your body mass index (BMI) and find out your weight category based on your height and weight. Use metric or US units and see BMI formulas, charts and examples.