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BMI Calculator

Calculate your BMI (Body Mass Index) from height and weight online for free. Metric and imperial. See your BMI category and healthy weight range.

Runs entirely in your browser — files never uploaded

Height
cm

How to use BMI Calculator

  1. 1. Choose your unit system. Switch between Metric (kg / cm) and Imperial (lbs / ft + in) using the toggle buttons.
  2. 2. Enter height and weight. Fill in your height and weight — the BMI updates in real time as you type.
  3. 3. View your result. See your BMI number, category badge (Underweight, Normal, Overweight, or Obese), a visual scale, and the healthy weight range for your height.

FAQ

What is BMI?

Body Mass Index (BMI) is a simple measure of body fat based on your weight relative to your height. It's calculated as weight (kg) divided by height (m) squared.

What is a healthy BMI range?

A BMI between 18.5 and 24.9 is considered normal weight. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is obese.

Is BMI accurate for everyone?

BMI is a useful screening tool but doesn't account for muscle mass, bone density, age, or sex. Athletes may have a high BMI despite low body fat. Consult a healthcare professional for a full assessment.

How is the healthy weight range calculated?

The healthy weight range is calculated by plugging your height into the BMI formula with BMI values of 18.5 and 24.9, giving you the minimum and maximum healthy weights.

Is my data sent anywhere?

No. All calculations happen entirely in your browser — nothing is uploaded or stored.

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