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BMI Calculator — Free Body Mass Index Calculator

Calculate BMI (Body Mass Index) using metric or imperial units. See BMI value, category, and healthy weight range. Free, client-side BMI calculator.

No uploads. Everything runs locally in your browser.

BMI calculator

Calculate your Body Mass Index (BMI) in metric or imperial units. Get your BMI value, category, and a healthy weight range estimate. Runs client-side for privacy.

Informational only — not medical advice. Consult a professional for health decisions.

Result

Enter weight and height to calculate BMI.

What is BMI?

BMI (Body Mass Index) estimates body fat using weight and height. It’s a quick screening measure, not a diagnostic tool.

BMI categories

Common ranges: Underweight (<18.5), Normal (18.5–24.9), Overweight (25–29.9), Obese (30+). Interpret with care; muscle mass and other factors matter.

Benefits & use cases

  • Quickly check BMI for general awareness.
  • Estimate healthy weight range for your height.
  • Switch metric/imperial units for convenience.

Note: BMI is a screening metric, not a medical diagnosis.

How to use BMI Calculator

  1. Enter your weight and height (switch metric/imperial as needed).
  2. Click Calculate to see BMI value and category.
  3. Copy the result or load a sample; clear to start over.

Key features of BMI Calculator

  • BMI calculation with metric and imperial units
  • BMI category and healthy weight range estimate
  • Sample loader, copy, and clear actions
  • Inline validation for missing/invalid inputs
  • Runs entirely in your browser

BMI Calculator — key benefits

  • Completely free with no signup or registration required.
  • Runs entirely in your browser — your data is never uploaded.
  • Works on desktop, tablet, and mobile devices.
  • Instant results with no waiting or processing queues.
  • Part of the ToolCircuit suite of free online utility tools tools.

FAQ

Is this free?

Yes. It runs locally in your browser.

Do you store my data?

No. Inputs are processed client-side only.

Which units are supported?

Metric (kg, cm) and Imperial (lb, inches).

What are the BMI categories?

Underweight (<18.5), Normal (18.5–24.9), Overweight (25–29.9), Obese (30+).

Is this medical advice?

No. This is informational only. Consult a professional for medical guidance.

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