NIH BMI Calculator
Height
Weight
BMI Calculator: Quick Overview
Body Mass Index (BMI) is a simple tool to estimate body fat based on height and weight.
Formula:
BMI = weight (kg) / [height (m)]²
For imperial units: (weight (lbs) / [height (in)]²) × 703
Categories:
Underweight: <18.5
Healthy weight: 18.5–24.9
Overweight: 25–29.9
Obesity: ≥30