Health

BMI Calculator

Enter your weight and height to get your Body Mass Index, see where it falls on the standard scale, and find the healthy weight range for your height.

Weight

Height

Calculated entirely in your browser — nothing you enter here is sent anywhere.

Result

24.2

Normal weight

Underweight (< 18.5)Normal (18.5–24.9)Overweight (25–29.9)Obese (≥ 30)

Healthy weight range for your height: 53–72 kg

BMI is a screening measure, not a diagnosis — it doesn't distinguish muscle from fat, so it can misread very muscular or very lean people. It's also intended for adults; growing children and teens are assessed against age-and-sex-specific percentiles instead.

How this works

Body Mass Index compares your weight to your height using a simple ratio, then places the result on the standard adult scale used by the WHO and CDC — underweight, normal weight, overweight, or obese. The gauge above shows exactly where your number falls across those bands, and the healthy weight range below it works the formula backward to show what weight, at your height, would land in the normal range. Everything runs in your browser as you type; nothing is sent anywhere.

FAQ

How is BMI calculated?: In metric units, BMI is your weight in kilograms divided by your height in meters, squared (kg / m²). In imperial units, it's your weight in pounds divided by your height in inches squared, then multiplied by 703 — a conversion factor that makes the imperial formula land on the same result as the metric one.
What do the BMI categories mean?: They're the standard adult ranges used by the WHO and the CDC: under 18.5 is classified as underweight, 18.5 to 24.9 as normal weight, 25 to 29.9 as overweight, and 30 and above as obese. These are population-level screening categories, not a judgment about any individual's health.
Is BMI actually a good measure of health?: It's a useful, quick screening tool at a population level, but it has real limitations for individuals: it can't tell muscle from fat, so athletes and very muscular people are often misclassified as overweight, and it doesn't account for age, sex, or where fat is distributed on the body — both of which affect health risk independently of BMI. Doctors typically use it as a starting point alongside other measures, not a standalone diagnosis.
Does this work for children or teens?: No — this calculator uses the fixed adult category thresholds. Children and teens are still growing, so their BMI is instead compared against age-and-sex-specific percentile charts. Talk to a pediatrician for that assessment.
How is the healthy weight range calculated?: It's the weight range that would put someone of your exact height inside the normal-weight band (a BMI of 18.5 to 24.9) — solving the same formula in reverse. It updates automatically as you change your height.