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BMI Calculator

Calculate your Body Mass Index. Supports Metric and Imperial units with visual scale and healthy weight range.

Calculator Tools Runs locally No data sent
reference health calculator
Unit System
cm
kg
—
Underweight Normal Overweight Obese
BMI Classification (WHO Standard)
BMI RangeCategory
Below 18.5Underweight
18.5 —24.9Normal weight
25.0 —29.9Overweight
30.0 and aboveObese

What is a BMI Calculator?

A BMI calculator uses your height and weight to estimate Body Mass Index (BMI). It helps you quickly see your BMI value, weight category, and a healthy weight range for your height.

How to Use BMI Calculator

  1. Enter your height and weight.
  2. Select metric (cm/kg) or imperial (feet/inches, pounds).
  3. See your BMI and weight category instantly.
  4. View the healthy weight range for your height.

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Understand BMI Calculator ▾
Example
Input Height: 175 cm, Weight: 70 kg
Output BMI: 22.9 —Normal weight (18.5—4.9)
Common Use Cases
  • Check whether your current weight falls within the standard BMI ranges.
  • Compare BMI quickly after switching between metric and imperial measurements.
  • Estimate a healthy target weight range for your height before planning diet or fitness goals.
BMI Categories and Limitations
  • Underweight: <18.5
  • Normal weight: 18.5—4.9
  • Overweight: 25—9.9
  • Obese Class I: 30—4.9

Limitations: BMI does not account for muscle mass, age, sex, or ethnic background. Athletes may have high BMI with low body fat. Consult a healthcare professional for a full assessment.

Why Use This Tool
  • Quick initial health screening using a widely-used metric.
  • Track changes over time with a consistent measurement.
  • Understand healthy weight range for your height.
Frequently Asked Questions
Is BMI accurate for athletes?

No —highly muscular people may be classified as overweight by BMI despite low body fat. BMI is a population-level screening tool, not an individual diagnostic.

Should I use metric or imperial?

Both give identical results —choose whichever units you are most comfortable with.

Can BMI diagnose health conditions?

No. BMI is a screening metric, not a diagnosis. It is useful for spotting broad weight categories, but it does not replace medical advice or a full health assessment.

Does this BMI calculator store my measurements?

No. Height, weight, and unit selections stay in your browser and are not uploaded to a server.