BMI Calculator
Calculate your Body Mass Index (BMI) online. Supports metric (kg/cm) and imperial (lb/ft). Shows BMI category and ideal weight range.
BMI Categories
Underweight< 18.5
Normal Weight18.5–24.9
Overweight25–29.9
Obese (Class I)30–34.9
Obese (Class II)35–39.9
About BMI Calculator
Calculate your BMI (Body Mass Index) using either metric or imperial units. See your BMI score, weight category (Underweight, Normal, Overweight, Obese), ideal weight range for your height, and a visual BMI scale. BMI is a general health screening tool — consult a healthcare provider for medical advice.
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Your privacy is built in
Everything in BMI Calculator runs locally in your browser — your data never leaves your device and is never uploaded to a server, so nothing you enter is stored or seen by anyone else. No account, no sign-up, no watermark, and completely free.
Frequently asked questions
What is a healthy BMI?
A BMI between 18.5 and 24.9 is considered normal weight. Below 18.5 is underweight, 25–29.9 is overweight, and 30+ is obese.
Is BMI accurate?
BMI is a general screening tool and does not account for muscle mass, age, or body composition. Athletes may have a high BMI despite being healthy. Always consult a healthcare professional.
Does it support feet and pounds?
Yes! Switch to Imperial mode to enter height in feet/inches and weight in pounds.