BMI & WHtR Calculator
BMI and waist-to-height ratio with WHO categories, optional Asian thresholds, metric or imperial.
Body Mass Index (BMI)
Enter height and weight to see your result.
Classification according to WHO guidelines.
Add your waist measurement to calculate waist-to-height ratio (WHtR).
Waist-to-height ratio (WHtR)
BMI and WHtR are screening tools, not diagnostic of body fatness or health. Please consult a healthcare provider.
How to use the BMI & WHtR Calculator
Calculate your BMI by switching to your preferred measurement system and entering your height and weight. Add your waist circumference for an estimation of waist-to-height ratio (WHtR).
How it calculates
WHtR = waist (cm) / height (cm)
This calculator follows the standard formulas defined by the World Health Organization.
Key terms
What is BMI?
Body Mass Index is a simple index of weight-for-height commonly used to classify underweight, overweight, and obesity in adults.
What is WHtR?
Waist-to-Height Ratio is a measure of the distribution of body fat. Higher values indicate higher risk of obesity-related cardiovascular diseases.
Why Asian norms?
WHO recommendations identify that Asian populations may have different amounts of body fat and associated health risks at a lower BMI.
Frequently Asked Questions
Common questions about the BMI & WHtR Calculator.
Frequently asked questions
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.
What is WHtR?
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.