Body Mass Index (BMI) is a simple calculation using your height and weight to estimate whether your weight falls in a healthy range. It's calculated as weight (kg) divided by height (m) squared.
Note: BMI is a general screening tool and does not directly measure body fat or account for muscle mass. Consult a healthcare professional for a full assessment.
Is BMI accurate for everyone?
BMI works reasonably well as a population-level screening tool, but it can overestimate body fat in muscular people (like athletes) and underestimate it in older adults who've lost muscle mass. It also doesn't account for where fat is distributed on the body.
What's a healthy BMI range?
18.5–24.9 is generally considered a healthy range for most adults, though the ideal range can shift slightly depending on age, sex, and ethnicity.
How is BMI calculated?
BMI = weight (kg) ÷ height (m)². For imperial units, the equivalent formula is BMI = 703 × weight (lb) ÷ height (in)² — this calculator handles the unit conversion for you automatically.