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BMI Calculator in kg and cm (Metric)

Calculate your Body Mass Index in metric or imperial units and see your WHO category on a color scale, entirely in your browser.

Your BMI:

BMI is a screening measure, not a diagnosis: it does not distinguish muscle from fat and ignores age and body composition. This tool is not medical advice — consult a healthcare professional about your weight and health.

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Result

This page opens the BMI calculator with the metric system preselected: type your height in centimeters and your weight in kilograms, and the index appears immediately. The metric formula is the original WHO definition — BMI equals weight in kilograms divided by height in meters squared, so a 170 cm, 70 kg person gets 70 / 1.70² ≈ 24.2.

The color scale below the number shows where you land among the WHO bands: below 18.5 is underweight, 18.5–24.9 is the normal range, 25–29.9 is overweight, and 30 or more splits into obesity classes I, II and III. The calculator also converts the normal band back into kilograms for your exact height, so you can see the healthy weight corridor rather than a single abstract number.

Everything runs locally in your browser — height and weight are never uploaded anywhere. If you think in feet, inches and pounds instead, switch the unit selector or open the imperial version of this calculator.

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Executed in Browser

Your files and inputs never leave this device. Processing runs completely offline. 100% Secure.

Accepted Formats & Rules

  • Color-coded BMI scale from underweight to obesity class III
  • Healthy weight range calculated for your exact height
  • Metric and imperial unit systems

Key Benefits

✓ Instant results: BMI, WHO category and healthy weight range update live as you type.
✓ Works in both metric (cm, kg) and imperial (ft/in, lb) units with one switch.
✓ Fully private: nothing you enter leaves your browser — no accounts, no tracking of your body data.

Use Cases

  • • Check your Body Mass Index and WHO weight category before a doctor's visit or fitness program.
  • • Find the healthy weight range for your exact height to set a realistic weight goal.
  • • Convert between metric and imperial measurements while tracking BMI for family members abroad.