How is BMI calculated?

BMI equals weight in kilograms divided by height in metres squared (kg ÷ m²). It is a screening tool, not a diagnosis.

WHtR is waist circumference divided by height using the same units. Values from 0.5 upward are often used as a simple marker of increased cardiometabolic risk.

When should I use Asian BMI cut-offs?

Enable Asian population thresholds if they apply to your context; they use lower BMI limits for overweight and obesity based on WHO expert consultation recommendations. When in doubt, discuss interpretation with a clinician.

Can I switch between metric and imperial?

Yes. Values are converted in your browser so height, weight and optional waist stay consistent when you change unit system.

Is this calculator a medical diagnosis?

No. BMI and WHtR are screening measures. They do not replace clinical assessment, body composition testing, or advice from a qualified health professional.

Health

BMI & WHtR Calculator

Estimate BMI and waist-to-height ratio using WHO guidance.

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Metric (cm, kg) Imperial (ft, in, lb)

Height (cm)

Weight (kg)

Waist (cm), optional

Asian population BMI cut-offs

Body Mass Index (BMI)

How to use the BMI & WHtR Calculator

How it calculates

Example	Inputs	Result

Everyday examples

Glossary

BMI & WHtR Calculator

Body Mass Index (BMI)

Waist-to-height ratio (WHtR)

How to use the BMI & WHtR Calculator

How it calculates

Everyday examples

Key terms

Frequently asked questions