Free BMI Calculator
Enter your height and weight to get your Body Mass Index instantly — with your WHO weight category and healthy weight range for your height.
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Your BMI
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Category
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Healthy weight range
Tip: metric = kg & cm · imperial = lb & inches.
How to use
- Choose metric or imperial units, then enter your weight and height.
- Your BMI, WHO category and healthy weight range appear instantly.
- BMI is a screening tool — pair it with waist and body-fat measures for a full picture.
Frequently asked questions
What is a healthy BMI?
For most adults, a BMI between 18.5 and 24.9 is considered healthy by the WHO.
How is BMI calculated?
BMI = weight in kilograms ÷ height in metres squared. Example: 70 kg ÷ (1.75 × 1.75) = 22.9.
Is BMI accurate for athletes?
Not always — muscle weighs more than fat, so muscular people can show a high BMI while being lean.
Is this BMI calculator free?
Yes — unlimited use, no account needed, and everything runs in your browser.