BMI & Ideal Weight Calculator

Calculate your Body Mass Index and estimated ideal weight range

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Shown alongside results for context only — not used in the BMI formula.

BMI (Body Mass Index) is a widely used screening measure that relates body weight to height. It can be a quick reference for comparing where someone falls relative to population weight ranges, and is commonly used in clinical and research settings.

The “ideal weight range” shown here is simply the weight range that corresponds to a BMI of 18.5–24.9 for your entered height — the range defined as “Normal” by the World Health Organization. It is a statistical reference, not a personal target or recommendation.

All calculations happen in your browser. No data is sent or stored anywhere.

How to Use

  1. 1Select your preferred units — Metric (cm/kg) or Imperial (ft+in/lb) using the toggle at the top.
  2. 2Enter your height and weight — your BMI and healthy weight range calculate instantly.
  3. 3Read your result alongside the standard WHO category ranges for context.

Frequently Asked Questions

Is BMI an accurate health measure?
BMI is a general screening tool only. It doesn’t account for muscle mass, bone density, age, or sex. Always consult a healthcare provider for a complete health assessment.
What is a healthy BMI range?
The WHO defines 18.5–24.9 as the normal range. However, what’s healthy varies by individual — your doctor is the best person to interpret your specific result.
Why does the tool show a weight range instead of a single number?
Because health isn’t a single number. We show the full range corresponding to a healthy BMI for your height, giving you context rather than a rigid target.
Does age affect BMI calculation?
Standard BMI formula doesn’t include age, though age-specific ranges exist for children and elderly adults. This tool uses the standard adult formula.