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BMI Calculator – Body Mass Index for Adults (lbs & kg)

Calculate your Body Mass Index from your height and weight in US units (feet, inches, pounds) or metric (cm, kg), and see which BMI category you fall into and your healthy weight range.

BMI Calculator

Height and weight – US or metric units

BMI is a screening tool for adults 20+, not a diagnosis. It does not account for muscle mass, bone density or body composition. Talk to a doctor about your health.

What is BMI?

Body Mass Index is a simple number calculated from your weight and height that is used by the CDC and WHO to screen for weight categories that may lead to health problems. It is the same for men and women.

BMI formula

Metric: BMI = weight (kg) ÷ height (m)². US units: BMI = 703 × weight (lb) ÷ height (in)². For example, someone 5'9" (69 inches) weighing 170 lb has a BMI of 703 × 170 ÷ 4,761 ≈ 25.1.

BMI categories for adults

Below 18.5 is underweight, 18.5–24.9 is a healthy weight, 25.0–29.9 is overweight, and 30.0 or above is obese (with classes I, II and III at 30, 35 and 40).

Limitations of BMI

BMI does not distinguish between fat and muscle, so athletes can score as "overweight" while being very lean, and older adults may have a normal BMI with too little muscle. Waist circumference, body-fat percentage and blood tests give a fuller picture.

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