O guia abaixo ainda não está disponível em português e é apresentado em inglês. A calculadora está totalmente traduzida.
Como usar esta calculadora
- Choose metric (kg, cm) or US units (lb, ft, in).
- Enter your height and weight.
- Read your BMI, its category and the weight range that corresponds to a BMI of 18.5–24.9 for your height.
Fórmula
BMI is weight divided by height squared. In US units the formula includes a conversion factor of 703.
BMI = weight (kg) / height (m)²
BMI = 703 × weight (lb) / height (in)²
Example
- Height 175 cm (1.75 m), weight 75 kg.
- BMI = 75 / 1.75² = 75 / 3.0625 = 24.5.
- 24.5 falls in the normal range (18.5–24.9).
Beyond BMI
Waist circumference and waist-to-height ratio give extra information about abdominal fat, which is linked to cardiometabolic risk. A waist-to-height ratio below 0.5 is a commonly used healthy target.
Use the body fat calculator for an estimate of body composition, and talk to a healthcare professional for a full assessment.
Perguntas frequentes
Is BMI accurate?
BMI is a quick screening measure for populations. It doesn't distinguish muscle from fat or account for fat distribution, so muscular people may be classified as overweight, and older adults may have more body fat than their BMI suggests.
Can I use this for children?
No. For people under 20, BMI is interpreted with age- and sex-specific percentile charts. Ask a pediatrician or use a pediatric BMI-for-age chart.
Are the BMI cut-offs the same for everyone?
These are WHO adult categories. Some health authorities use lower cut-offs for people of Asian descent (for example, overweight from 23) because health risks rise at lower BMI.
What is BMI Prime?
BMI Prime is your BMI divided by 25, the upper limit of the normal range. A value of 1.0 is at the limit; 0.9 means 10% below it.