Waist-to-height ratio (WHtR) is a simple but powerful metabolic health indicator. By comparing your waist circumference to your height, it captures central adiposity — the visceral fat around your organs that drives cardiovascular and metabolic risk. The rule of thumb: keep your waist to less than half your height (WHtR < 0.5).
Calculate Your WHtR
Measure at the midpoint between your lowest rib and hip bone, at the level of your navel.
How to Use the Waist-to-Height Ratio Calculator
The waist-to-height ratio (WHtR) is calculated by dividing your waist circumference by your height — both in the same unit. The result reflects how much central body fat you carry relative to your overall body size. Research consistently shows WHtR is a better predictor of cardiometabolic risk than BMI alone.
Step 1: Measure Your Waist
Use a soft measuring tape. Stand up straight, exhale normally, and measure at the narrowest point of your torso — usually just above the navel or at the midpoint between the bottom of your lowest rib and the top of your hip bone. Do not pull the tape tight.
Step 2: Enter Your Height
Toggle between metric (cm) and imperial (feet/inches) using the switch. The calculator converts automatically.
Understanding Your WHtR
The formula is WHtR = waist ÷ height. The key threshold is 0.5. A ratio below 0.5 means your waist is less than half your height — the goal for most adults. Between 0.5-0.6 indicates increased risk, and above 0.6 indicates high risk of metabolic complications including type 2 diabetes, hypertension, and cardiovascular disease.
WHtR vs BMI
A muscular person may have a "healthy" BMI but an elevated WHtR if they carry excess abdominal fat. Conversely, a slim person with a large belly (sometimes called "skinny fat") may have a normal BMI but a dangerous WHtR. Using both metrics together gives a more complete health picture.
This tool is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider for diagnosis, treatment, or any health concerns.
Frequently Asked Questions
Is this waist-to-height ratio calculator free?
Yes, completely free with no signup required. All calculations happen in your browser.
Is my data private?
Yes. Your measurements are never sent to a server — all calculations are local.
What is a healthy waist-to-height ratio?
The key threshold is 0.5 — keeping your waist circumference to less than half your height is associated with significantly lower cardiovascular and metabolic risk. Optimal is below 0.5, increased risk is 0.5-0.6, and high risk is above 0.6.
Why is WHtR better than BMI?
BMI does not account for where body fat is stored. Waist-to-height ratio specifically measures central (abdominal) adiposity, which is more strongly linked to cardiovascular disease, type 2 diabetes, and metabolic syndrome than overall weight. WHtR also accounts for body size differences across heights.
How do I measure my waist correctly?
Measure your waist at the midpoint between the bottom of your lowest rib and the top of your hip bone, approximately at the level of your belly button. Breathe out normally and measure without sucking in your stomach. Use a soft measuring tape.
Does WHtR apply to children?
WHtR can be used for children and adolescents, though reference ranges differ. The 0.5 threshold is primarily validated for adults. Consult a pediatric healthcare provider for child-specific interpretation.