What is Obesity Class III?

Also known as morbid obesity, it is defined as a BMI of 40 or greater, or 35+ with obesity-related health conditions.

Medical BMI Calculator – Professional Weight Assessment | CalcTools

Calculate BMI with precise medical classification (Obesity I, II, III). Professional health service.

While simple BMI is for everyone, our Medical BMI service provides the deeper classification needed for clinical documentation and risk stratification. Beyond identifying 'obesity', this tool distinguishes between Classes I, II, and III (Morbid) obesity, which carry significantly different risks for cardiovascular disease, sleep apnea, and metabolic syndrome. It is a fundamental service for primary care and public health screening.

Educational use only. This tool does not replace clinical judgment or local protocols.

Mass (kg)

Height (cm)

Medical BMI

22.9

BMI is 22.9 (Normal Range)

Mass (kg)70 kg

Height (cm)175 cm

ClassificationNormal Range

How it Works

The tool performs standard metric division and then compares the result to the World Health Organization (WHO) and CDC clinical threshold tables.

Calculation Formula

BMI = kg / m²

Calculation Examples

1. **Obesity I**: 95kg at 175cm = **31.0**.

Why use this tool in your daily life?

Accurate clinical labeling. This service ensures that health records accurately reflect a patient's risk profile, facilitating appropriate medical interventions and insurance documentation.