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Open →Free BMI Calculator
Enter your height and weight to get your Body Mass Index, its category, and the healthy weight range for your height.
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Your BMI
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Category
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Healthy range for your height
BMI is a screening measure, not a diagnosis. It does not measure body fat directly — if you are concerned about your weight, talk to a health professional.
100% free · No signup · Your numbers never leave your browser.
What is a BMI calculator?
A BMI calculator divides your weight by the square of your height to give your Body Mass Index — a standard screening number used worldwide. A BMI between 18.5 and 24.9 is classed as the healthy range for most adults. This calculator works in metric and imperial units and shows the healthy weight range for your height.
How to use the BMI calculator
- Step 1: Choose Metric (kg, cm) or Imperial (lb, ft/in).
- Step 2: Enter your height and weight.
- Step 3: Read your BMI, its category, and the healthy weight range calculated for your height.
The BMI formula and categories
BMI = weight (kg) ÷ height (m)². The standard adult categories are: under 18.5 underweight, 18.5–24.9 healthy weight, 25–29.9 overweight, 30 and above obese. Athletes with heavy muscle mass can score high without excess fat, and BMI does not apply directly to children or during pregnancy — treat it as a starting point, not a verdict.
Private by design
Your height and weight are health data. Everything runs in your browser with plain JavaScript — nothing is uploaded, stored or logged.
Frequently asked questions
Is this BMI calculator free?
Yes — completely free, no signup, no limits.
What is a healthy BMI?
For most adults, a BMI between 18.5 and 24.9 is classed as the healthy range.
Can I use pounds and feet?
Yes — switch to Imperial and enter feet, inches and pounds; the conversion is automatic.
Is BMI accurate for athletes?
BMI cannot tell muscle from fat, so very muscular people may be classed as overweight. It is a screening tool, not a diagnosis.
Does it work for children?
No — children and teenagers use age- and sex-specific percentile charts instead. This calculator uses the adult ranges.
Is my data uploaded anywhere?
No. The calculation happens entirely in your browser.
Short answer: A BMI calculator divides your weight by the square of your height to give your Body Mass Index — a standard screening number used worldwide. A BMI between 18.5 and 24.9 is classed as the healthy range for most adults. This calculator works in metric and imperial units and shows the healthy weight range for your height.
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