Free Online BMI Calculator

Q: What is a healthy BMI score range?

For most adults, a healthy BMI score falls between 18.5 and 24.9.

Q: Does the calculator check child BMI scores?

This calculator uses standard adult parameters. Child BMI evaluations require comparison to percentiles.

Q: How is BMI calculated?

The formula is: `weight (kg) / height^2 (m^2)`. For imperial units, it is `(weight (lbs) / height^2 (in^2)) * 703`.

Calculate your Body Mass Index (BMI) and find health category ranges based on height and weight.

How to use & benefits of BMI Calculator

Estimate Healthy Body Weight Ranges

Body Mass Index (BMI) is a standardized metric used by medical systems to evaluate body fat levels relative to height and weight. It categories adults into underweight, normal, overweight, and obese brackets.

Our free online BMI calculator supports both metric (kg/cm) and imperial (lbs/inches) inputs, delivering instant health categorizations.

Important: While BMI is a useful screening indicator, it does not distinguish between muscle mass and fat (meaning athletic bodybuilders may have a high BMI despite low body fat).

Key Benefits & Features

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Metric & Imperial presets

Supports height/weight inputs in centimeters, meters, inches, kg, and pounds.

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Immediate Classification

Identifies standard categories: Underweight (<18.5), Normal (18.5-24.9), Overweight (25-29.9), Obese (30+).

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Secure Local Calculation

Height and weight details remain private and are never saved.

How to Use the BMI Calculator Step-by-Step

This utility runs entirely inside your browser using client-side JavaScript. We prioritize your security: none of your inputted text is logged or stored.