BMI Calculator
Calculate your Body Mass Index (BMI) with imperial or metric units. See your BMI category, healthy weight range, and a visual BMI scale.
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Frequently Asked Questions
How is BMI calculated?▾
BMI is calculated by dividing your weight by the square of your height. In metric units: BMI = weight(kg) / height(m)². In imperial units: BMI = (weight(lbs) × 703) / height(in)². This tool handles both systems automatically.
What are the BMI categories?▾
The World Health Organization defines four BMI categories: Underweight (below 18.5), Normal weight (18.5–24.9), Overweight (25–29.9), and Obese (30 and above). This calculator shows your category and where you fall on the scale.
What is a healthy BMI range?▾
A BMI between 18.5 and 24.9 is considered healthy for most adults. This calculator also shows the healthy weight range in pounds or kilograms for your specific height.
Is BMI accurate for everyone?▾
BMI is a useful screening tool but does not account for muscle mass, bone density, age, or body composition. Athletes and muscular individuals may have a high BMI without excess body fat. Consult a healthcare provider for a complete assessment.
Is my health data safe when using this BMI calculator?▾
Yes. All calculations happen entirely in your browser. No weight, height, or health data is ever sent to a server.