BMI Calculator
Body Mass Index with WHO health categories.
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Introduction
BMI Calculator — Body Mass Index with WHO health categories. Enter Units, Height (cm), Weight (kg) to get an instant, accurate result.
Formula
Metric: BMI = weight(kg) / height(m)². Imperial: BMI = 703 × weight(lb) / height(in)².
Step-by-step
- Enter the Units.
- Enter the Height (cm).
- Enter the Weight (kg).
- Click Calculate to see your result instantly.
Real-world example
Example: With Units = metric, Height (cm) = 170, Weight (kg) = 70, the BMI Calculator gives BMI: 24.2215, Category: Normal.
Frequently Asked Questions
What BMI ranges are considered normal?
Under 18.5 is underweight, 18.5–24.9 is normal, 25–29.9 is overweight, and 30+ is classified as obese.
Does BMI account for muscle mass?
No — BMI doesn't distinguish muscle from fat, so it can be misleading for very muscular people.
What inputs does the BMI Calculator need?
You'll need to provide: Units, Height (cm), Weight (kg). All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the BMI Calculator?
The BMI Calculator applies the formula exactly as calculated — Metric: BMI = weight(kg) / height(m)². Imperial: BMI = 703 × weight(lb) / height(in)². — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is this a medical diagnosis?
No. The BMI Calculator provides an estimate based on standard formulas and general population data, not a medical diagnosis or personalized clinical advice. Individual results can vary — consult a doctor or other qualified healthcare provider for medical concerns.
Is the BMI Calculator free to use?
Yes, the BMI Calculator is completely free, requires no signup, and runs instantly in your browser.
About the BMI Calculator
The BMI Calculator uses a real, verifiable formula — Metric: BMI = weight(kg) / height(m)². Imperial: BMI = 703 × weight(lb) / height(in)². — so results are accurate every time, not an approximation.