BMI Calculator
Formula
BMI = weight(kg) ÷ height(m)²
BMI (Body Mass Index) is calculated by dividing your weight in kilograms by the square of your height in meters. BMI categories: Under 18.5 = Underweight, 18.5-24.9 = Normal, 25-29.9 = Overweight, 30+ = Obese.
Frequently Asked Questions
What is a healthy BMI?
A BMI between 18.5 and 24.9 is considered normal/healthy weight by the WHO. However, BMI doesn't account for muscle mass, age, sex, or body composition.
Is BMI accurate for athletes?
No. BMI can be misleading for muscular people since muscle weighs more than fat. A bodybuilder may have a 'overweight' BMI despite low body fat.
How do I convert lbs to kg for BMI?
Divide your weight in pounds by 2.205. For example, 154 lbs ÷ 2.205 = 70 kg.
What are the BMI categories?
Underweight: below 18.5. Normal: 18.5-24.9. Overweight: 25-29.9. Obese Class I: 30-34.9. Obese Class II: 35-39.9. Obese Class III: 40+.