Last updated: March 2026
What Is the Body Mass Index Calculator?
Body Mass Index (BMI) is a simple measure of body fat based on height and weight. Enter your measurements in imperial (lb/ft) or metric (kg/cm) units to see your BMI, category, and healthy weight range according to WHO standards.
The visual gauge shows where you fall on the BMI scale from underweight to obese. BMI is a screening tool, not a diagnostic measure â consult a healthcare provider for personalized health assessment.
Frequently Asked Questions
What is a healthy BMI?
A BMI of 18.5-24.9 is considered normal weight. Below 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese according to WHO standards.
Is BMI accurate for athletes?
BMI doesn't distinguish between muscle and fat. Athletes with high muscle mass may have an elevated BMI despite being healthy.
Does age or gender affect BMI?
The BMI formula is the same for all adults, but interpretation may vary by age and gender. Consult a healthcare provider for personalized assessment.