This calculator computes body mass index (BMI) from height and weight. It also displays the standard adult category and the weight range corresponding to BMI 18.5 through 24.9 at the entered height.
BMI is a screening ratio, not a direct measure of body fat or health. It can be less informative for muscular individuals, pregnancy, growing children, older adults with muscle loss, and some population-specific risk assessments.
Use kilograms and a recent measurement.
Use centimeters without shoes.
The main result is weight divided by squared height in meters.
The displayed category uses common adult cutoffs.
The tool calculates weights matching BMI 18.5 and 24.9 for the entered height.
Consider body composition and individual medical context alongside BMI.
BMI = weight (kg) ÷ height (m)²
Reference weight = target BMI × height (m)²
The main result is the ratio of body weight to squared height, expressed in kg/m².
BMI categories are screening conventions and do not replace an individualized assessment.
Given: Weight 75 kg and height 175 cm.
Calculation: Height = 1.75 m. BMI = 75 ÷ 1.75² = 24.49. Weight at BMI 18.5 = 18.5 × 1.75² = 56.7 kg. Weight at BMI 24.9 = 76.3 kg.
Result: BMI 24.5, within the standard adult “normal weight” category.
BMI measures weight relative to height. It does not directly measure fat mass, muscle mass, or fat distribution.
No. Children and adolescents require age- and sex-specific growth references rather than fixed adult cutoffs.
Yes. Additional muscle can raise weight and BMI even when body fat is not high.
It converts the standard adult BMI range of 18.5 to 24.9 into weights for the entered height. It is a reference, not a personalized target.
No. Waist measurements, body composition, medical history, blood pressure, laboratory results, and functional health may add important context.