Waist-to-Height Ratio Calculator
Calculate your waist-to-height ratio — a simple, powerful indicator of health risk based on a straightforward rule: keep your waist under half your height.
Use the same unit for both waist and height
What is the waist-to-height ratio?
The waist-to-height ratio (WHtR) is your waist circumference divided by your height. It is one of the simplest and most effective measures of health risk, based on a memorable rule: keep your waist to less than half your height. Because it directly captures central fat — the fat stored around your abdomen and organs — many researchers consider it a better predictor of health risk than BMI, which cannot tell where fat is stored.
Why it works so well
Fat around the middle, known as visceral fat, is the type most strongly linked to heart disease, type 2 diabetes and other conditions. By relating waist size to height, the WHtR accounts for body size in a simple way and applies well across different ages, sexes and ethnic groups. A major advantage is its simplicity: it needs only two measurements and an easy threshold, making it a practical screening tool that anyone can use at home.
Understanding your result
A waist-to-height ratio below 0.5 is generally considered healthy, meaning your waist is less than half your height. A ratio of 0.5 to 0.6 indicates increased risk, and above 0.6 indicates high risk. Because the ratio divides two measurements in the same unit, it does not matter whether you measure in centimetres or inches, as long as you are consistent. Measure your waist at the level of your navel, standing relaxed, with the tape snug but not compressing the skin.
What you can do
If your ratio is above the healthy threshold, the encouraging news is that central fat often responds well to lifestyle changes. Regular physical activity, especially combining aerobic exercise with strength training, a balanced diet lower in refined carbohydrates and added sugars, adequate sleep and stress management all help reduce abdominal fat over time. Even a modest reduction in waist size meaningfully lowers your health risk. Discuss any concerns with your doctor.
Frequently Asked Questions
A ratio below 0.5 is considered healthy — meaning your waist measures less than half your height. A ratio of 0.5 to 0.6 indicates increased risk, and above 0.6 indicates high risk. The simple rule is to keep your waist under half your height.
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Sources & References
- 1.Ashwell M, Gunn P, Gibson S.. Waist-to-height ratio as an indicator of early health risk. Obesity Reviews.
- 2.National Institute for Health and Care Excellence (NICE). Obesity: identification, assessment and management.
- 3.British Heart Foundation. Why your waist size matters.
LifeCheckIQ content is based on peer-reviewed research, recognised clinical guidelines, and authoritative medical sources, and is reviewed by Deborah Adotso, General Nurse, for clinical accuracy.
Medical Disclaimer: This tool is for informational and educational purposes only. Results are not a medical diagnosis. Always consult a qualified healthcare professional for medical advice, diagnosis, or treatment. In an emergency, call your local emergency number or visit the nearest hospital immediately.