Free BMI calculator — find your Body Mass Index in metric or imperial units with WHO health category interpretation.
Your measurements
Enter details once. Result updates instantly — no calculator-button ceremony.
Gender is used only for tone in the guidance copy. BMI calculation uses height and weight only.
Your BMI snapshot
The gauge and score cards adapt to the current BMI category.
BMI score
22.5
Healthy range
53.5–72.0 kg
Your BMI falls in the recommended healthy range. Keep the rhythm with movement, balanced meals, and recovery — boring in theory, powerful in practice.
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The QuickToolz BMI Calculator computes your Body Mass Index from your height and weight in either metric (cm, kg) or imperial (ft/in, lb) units. Your result is shown with the official WHO BMI category — underweight, normal, overweight, or obese — and a clear explanation of what it means.
Body Mass Index is a simple ratio of weight to height (kg/m²) used by clinicians and public-health organizations as a screening indicator of body fatness. It is not a diagnostic tool, but it’s a quick, widely-recognized way to check if your weight is in a healthy range for your height.
Underweight: below 18.5
Normal weight: 18.5 – 24.9
Overweight: 25.0 – 29.9
Obese: 30.0 and above
BMI doesn’t distinguish muscle from fat, so it can over-estimate body fat in athletes and under-estimate it in older adults. Always discuss your numbers with a qualified healthcare provider before making health decisions.
Everything you need, nothing you don’t. Built for speed and simplicity.
Works with cm/kg or ft·in/lb — toggle freely.
See whether you fall into underweight, normal, overweight, or obese ranges.
Updates as you type — no calculate button.
Everything you need, nothing you don’t. Built for speed and simplicity.
Toggle between centimetres/kilograms and feet-inches/pounds.
Got questions? We’ve got answers. Common questions about BMI Calculator.
Your height and weight stay on your device.
Type your height and weight — both fields accept decimals.
Your BMI value, category, and a plain-English interpretation update instantly.