BMI Calculator
Enter your height and weight to find your BMI and health category.
BMI is just one reference point — it doesn't account for body fat percentage or muscle mass. Not a substitute for medical advice.
What Is BMI?
BMI (Body Mass Index) is the most common screening tool for assessing whether someone's weight falls within a healthy range, based on the ratio of weight to height. No blood test or special equipment is needed — just your height and weight — which is why it's widely used in checkups, insurance assessments, and everyday health tracking.
How Is BMI Calculated?
The formula is simple: weight in kilograms divided by height in meters, squared.
For example, someone who is 170 cm (1.7 m) tall and weighs 65 kg has a BMI of 65 ÷ (1.7 × 1.7) ≈ 22.5, which falls in the normal range.
Frequently Asked Questions
What counts as a normal BMI range?
This calculator uses the Asia-Pacific WHO-adjusted thresholds: under 18.5 is underweight, 18.5–24 is normal, 24–27 is overweight, and 27+ is obese. These cutoffs are slightly stricter than the standard international WHO thresholds (25/30), which are calibrated for Asian body compositions.
Does a high BMI always mean someone is overweight?
Not necessarily. BMI only accounts for height and weight, not the ratio of muscle to fat. People with high muscle mass, like athletes or weightlifters, can have a high BMI while having a healthy body fat percentage. It's best used alongside other measures like body fat percentage or waist circumference.
Does BMI apply to everyone?
BMI works well as a first-pass screening tool for the general adult population, but it's less reliable for pregnant women, growing children and teens, older adults, and competitive athletes. These groups should consult a doctor for a more complete assessment.
Related Tools
📖 Related guide
Use BMI as a starting point and learn which other measurements can add context to the result.
Read the BMI guide →How to use BMI without over-reading it
BMI is a fast screening ratio of weight to height. It does not measure body fat, muscle, or where fat is stored. Two people can share the same BMI and still differ in fitness and risk. Prefer trends over single readings, and pair BMI with waist circumference when you can.
This calculator uses adult cutoffs commonly applied in Asia-Pacific contexts (underweight below 18.5, normal 18.5–24, overweight 24–27, obese 27+), which are stricter than some international WHO cutoffs. Always check which standard your clinic or insurer uses. Results are educational only and are not a diagnosis. All math runs in your browser; height and weight are not uploaded.