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.
Quick examples
Metric screening
175 cm and 78 kg gives BMI about 25.5 - near the boundary between normal weight and overweight on standard WHO cut-offs.
Asian BMI cut-offs
With the same numbers, enabling Asian population thresholds can move the classification earlier into overweight, reflecting lower BMI limits from WHO expert consultation.
WHtR with waist
Waist 88 cm and height 178 cm yields WHtR about 0.49 - useful as a simple waist-to-height marker alongside BMI.
Imperial input
Feet, inches, and pounds are converted in the browser to centimetres and kilograms before BMI and WHtR are computed.
How to use the BMI & WHtR calculator
Choose metric or imperial, enter height and weight, and optionally your waist circumference for waist-to-height ratio (WHtR). Toggle Asian population cut-offs if they apply to your context.
How it calculates
WHtR = waist (cm) / height (cm)
This calculator uses the standard formulas aligned with World Health Organization guidance for screening categories.
Key terms
What is BMI?
Body Mass Index is a simple weight-for-height index used to classify underweight, overweight, and obesity in adults for screening.
What is WHtR?
Waist-to-height ratio compares waist circumference to height in the same units. Higher values can indicate higher cardiometabolic risk.
Why Asian norms?
WHO notes that some Asian populations may carry different body fat and health risk at a lower BMI, so optional lower cut-offs are offered.
Frequently asked questions
How BMI and WHtR work, Asian thresholds, units, and medical limits.
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 them if they apply to your context; they use lower BMI limits for overweight and obesity based on WHO expert consultation. When in doubt, discuss 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.