How to Use the BMI (Body Mass Index) Calculator
This calculator is designed to provide immediate answers without manual arithmetic or confusing steps. Simply input your values into the fields above; results update automatically as you adjust numbers. You can also customize your currency and tax preferences using the region selector in the header.
Formula & Calculation Method
Metric: BMI = weight (kg) ÷ [height (m)]²; Imperial: BMI = 703 × weight (lbs) ÷ [height (inches)]²
Our algorithms strictly follow standard international accounting, scientific, and engineering formulas to ensure 100% precision.
Frequently Asked Questions
What are the WHO BMI categories?
Underweight: < 18.5; Normal weight: 18.5 - 24.9; Overweight: 25.0 - 29.9; Obese: 30.0 and above.
Is BMI accurate for athletes and bodybuilders?
BMI does not distinguish between muscle mass and fat mass, so muscular individuals may have a high BMI while having very low body fat.