BMI Calculator
Free BMI calculator. Enter your height and weight in metric or imperial units to get your Body Mass Index, category, and ideal weight range instantly.
Good to know
BMI Calculator — frequently asked questions
How is BMI calculated?
BMI equals your weight in kilograms divided by the square of your height in metres (kg/m²). For imperial units, BMI = 703 × weight (lb) ÷ height (in)². Etoolio does this instantly and rounds to one decimal place.
What is a healthy BMI range?
A BMI between 18.5 and 24.9 is considered a normal, healthy weight. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is classed as obese.
Is BMI accurate for everyone?
BMI is a useful general screening tool but it does not distinguish muscle from fat. Very muscular people may read as 'overweight' while it can underestimate body fat in older adults. Treat it as a guide, not a diagnosis.
Does this BMI calculator work in pounds and feet?
Yes. Toggle to Imperial to enter weight in pounds and height in feet and inches — results and your ideal weight range convert automatically.