BMI Calculator

BMI = weight(kg) ÷ height(m)². WHO standard: healthy 18.5–24.9, overweight 25–29.9, obese ≥30. WHO Asia-Pacific: increased risk from 23, high risk from 27.5. The healthy weight range multiplies 18.5 and 25 by your height².

WHO (2000) Technical Report Series 894; WHO Expert Consultation (2004) Lancet — Asian BMI cut-offs.

BMI is a screening tool, not a body-composition measure. It ignores muscle, frame size, and fat distribution, so read it alongside waist and body-fat data.

Athletes and very muscular people (fat is over-estimated), pregnant women, children and teens (use age-and-sex growth charts), and the frail elderly.

Body Mass Index is your weight in kilograms divided by your height in metres squared. It's a quick screening tool that sorts people into weight categories — but it doesn't measure body fat or health directly.

The standard WHO cut-offs were derived mainly from European populations. Research shows people of Asian descent face higher health risks at lower BMIs, so the WHO also publishes Asian-specific cut-offs (overweight risk begins at 23 instead of 25). We show both so you can read whichever fits.

Often not. BMI can't tell muscle from fat, so muscular people are frequently flagged as 'overweight' despite low body fat. If you train seriously, pair BMI with a body-fat estimate for a fuller picture.

On the WHO standard scale, 18.5–24.9 is the healthy range. This calculator translates that into an actual weight range for your height, so you have a concrete target rather than an abstract number.

BMI is a starting point for a conversation, not a diagnosis. Trends over time, waist measurement, blood markers, and how you feel matter more. Use it to decide whether a closer look is worthwhile, not to judge yourself.