What is Body Mass Index (BMI)?

BMI is a statistical screening measure comparing weight to height to categorize individuals as underweight, normal weight, overweight, or obese.

What is the healthy BMI range?

For adults, a normal and healthy BMI ranges from 18.5 to 24.9 kg/m².

BMI Calculator

Body Mass Index – evaluation of underweight, normal weight, overweight, and obesity according to WHO.

Input Parameters

Height

100 cm Standard: 150 – 200 cm 240 cm

Weight

35 kg Standard: 50 – 120 kg 200 kg

Gender

Age

years

15 years 15 – 95 years 95 years

Body Frame Type

Include waist circumference for visceral fat detection (WHtR)

Waist Circumference

50 cm At navel level during normal exhalation 160 cm

Calculation Result

Evaluating...

Value Scale

Normal

Recommendations & Interpretation

Enter your parameters to view professional recommendations.

Scientific Methodology & Formula

The Body Mass Index (BMI) is an internationally recognized screening parameter for assessing body composition in adults, established by the World Health Organization (WHO).

WHO Standard (1832)

BMI = weight (kg) / (height in meters)²

Oxford Formula (2013)

Oxford BMI = 1.3 × weight (kg) / (height in meters)^2.5

Height-Adjusted BMI (Oxford University)

The traditional 1832 Quetelet formula divides weight by height squared, distorting results for tall and short individuals. The Oxford formula (1.3 × weight / height^2.5) accounts for realistic 3D human body scaling.

Waist-to-Height Ratio (WHtR)

A primary indicator of visceral belly fat. Your waist circumference should measure less than half your height (ratio below 0.50), indicating low cardiometabolic risk regardless of muscular build.

Category	Range	Health Risk
Severe Underweight	< 16.0	High
Underweight	16.0 – 18.4	Moderate
Normal Weight	18.5 – 24.9	Minimal (Optimal)
Overweight	25.0 – 29.9	Increased
Class I Obesity	30.0 – 34.9	High
Class II Obesity & Class III Obesity (Morbid)	≥ 35.0	Very High