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Calculate your Body Mass Index using your height and weight. Choose metric or imperial units and get your BMI instantly.
Body Mass Index
Your BMI
Healthy weight
Your BMI falls within the general adult healthy-weight range. BMI alone does not provide a complete picture of health.
BMI formula: BMI = weight (kg) ÷ height² (m²). For imperial measurements, BMI = 703 × weight (lb) ÷ height² (inches).
BMI is a general screening measure and does not directly measure body fat or diagnose an individual's health. Factors such as age, muscle mass and overall health can affect how BMI should be interpreted.
General adult BMI categories
BMI: Below 18.5
BMI: 18.5 – 24.9
BMI: 25.0 – 29.9
BMI: 30.0 or higher
Select either metric or imperial units and enter your height and weight. The calculator automatically calculates your Body Mass Index and displays the corresponding general BMI category. You can change your measurements at any time to compare different values.
Select metric or imperial measurements.
Enter your height and weight.
Your BMI and general category appear instantly.
Body Mass Index, commonly called BMI, is calculated using a person's weight and height. With metric measurements, weight in kilograms is divided by height in meters squared. For example, if someone weighs 70 kg and is 1.70 m tall, the calculation is 70 ÷ (1.70 × 1.70), which produces a BMI of approximately 24.2. For imperial measurements, weight in pounds and height in inches are used with a conversion factor of 703.
BMI = kg ÷ (m × m)
BMI = 703 × lb ÷ in²
Common questions about BMI
BMI stands for Body Mass Index. It is a calculation based on height and weight that is commonly used as a general screening measure.
For adults, a BMI from 18.5 to 24.9 is commonly categorized as healthy weight. BMI categories are general screening ranges and should not be treated as an individual diagnosis.
BMI has limitations because it does not directly measure body fat or distinguish between muscle and fat. Its interpretation can vary depending on factors such as age, muscle mass and other aspects of health.
Yes. Select the Imperial option and enter your weight in pounds and your height in feet and inches.
Adult BMI categories should not be applied directly to children and teenagers. BMI for younger people is interpreted using age- and sex-specific growth charts.
No. BMI is a screening measure rather than a diagnosis. For personal health interpretation, consider discussing your measurements and overall health with a qualified healthcare professional.
Want to understand how BMI is calculated, what the numbers mean, or how the formula works? Ask your question.