Enter your height in centimeters or feet and inches, plus your weight in kilograms, to get your BMI and category instantly.
BMI is weight in kilograms divided by height in meters squared. Switch the height unit dropdown to feet & inches if that's easier to enter — it's converted to meters automatically either way.
No. BMI is a screening estimate based on height and weight only — it doesn't account for muscle mass, bone density, age, or frame size, so treat the category as a starting point, not a diagnosis. For a full picture, a doctor considers other factors alongside it.
Under 18.5 is generally classed as underweight, 18.5–24.9 as a healthy range, 25–29.9 as overweight, and 30+ as obese, per the commonly used adult thresholds.
No — BMI for anyone under 20 is interpreted using age- and sex-specific percentile charts, not the fixed adult categories this calculator uses. A pediatrician's growth chart is the correct tool for a child or teen's BMI, not this calculator.
No — BMI can't distinguish muscle from fat, so a muscular person can show as 'overweight' despite having low body fat. Body fat percentage or waist-to-height ratio are better measures in that specific case.
Worked example: a person who is 175cm tall and weighs 72kg has a BMI of 72 ÷ (1.75×1.75) = 72 ÷ 3.0625 ≈ 23.5, which falls in the healthy range (18.5–24.9).