Calculate Your BMI
Body Mass Index (BMI) is a quick way to estimate whether your weight is in a healthy range for your height. It is calculated from only two numbers—height and weight—so it works for most adult men and women and lets you compare yourself with standard BMI categories (underweight, healthy, overweight and obese).
Keep in mind, however, that BMI looks only at total weight. It doesn’t separate fat from muscle, and it can’t reflect differences in bone density, age, sex or body composition. Use your BMI as a starting point, then talk with a health-care professional who can consider your lifestyle, waist-to-hip ratio and other clinical measurements to give you personalised advice.
BMI Calculator
BMI — Frequently Asked Questions
What is BMI and how is it measured?
BMI (Body Mass Index) is a screening number that compares your weight with your height to flag possible weight-related health risks. It is reported in kg/m² and does not diagnose health by itself.
What Body Mass Index is considered good?
For most adults, 18.5–24.9 kg/m² is considered the healthy range and is associated with lower risk of weight-related conditions.
How is Body Mass Index calculated?
Metric: BMI = weight (kg) ÷ [height (m)]². Imperial: BMI = [weight (lb) × 703] ÷ [height (in)]².
Does Body Mass Index depend on gender and age?
For adults, BMI categories are the same for men and women and do not change with age. For children and teens, BMI is interpreted using age- and sex-specific percentiles (BMI-for-age).
What Body Mass Index is obese?
Obesity begins at BMI ≥ 30.0 kg/m² and is classified as Class I (30.0–34.9), Class II (35.0–39.9), and Class III (≥ 40.0).
BMI Calculators
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