BMI Calculator
Calculate your Body Mass Index (BMI) and see which health category you fall into. Supports both metric (kg/cm) and imperial (lbs/ft) units.
Frequently Asked Questions
What is BMI and how is it calculated?
Body Mass Index (BMI) is a screening measure of body fat based on height and weight. It is calculated as weight (kg) ÷ height² (m²). In imperial units: BMI = 703 × weight (lbs) ÷ height² (inches²). A BMI between 18.5 and 24.9 is considered healthy for most adults.
What do BMI categories mean?
The standard BMI categories are: Underweight (below 18.5), Normal weight (18.5–24.9), Overweight (25–29.9), and Obese (30 and above). These categories are the same for men and women. BMI is a useful screening tool but does not directly measure body fat; athletes may have a high BMI due to muscle mass.
Is BMI accurate for everyone?
BMI has limitations: it can overestimate body fat in muscular individuals and underestimate it in older adults who have lost muscle. It also does not account for fat distribution (e.g., belly fat vs. hip fat). For a fuller picture, combine BMI with waist circumference and body fat percentage measurements.