Waist-to-Height Ratio Calculator
WHtR — a simple central obesity indicator
🔒 No uploads · Method · · Disclaimer · Waist-to-Height Ratio Calculator
Need a fast answer on WHtR? Waist-to-Height Ratio Calculator answers with the steps beside it. You supply Waist (cm) and Height (cm) to Waist-to-Height Ratio; the answer follows at once. In Waist-to-Height Ratio the working sits beside the answer. That makes Waist-to-Height Ratio handy for quick estimates anywhere. Waist-to-Height Ratio runs in your browser. Health data stays in the tab. Waist-to-Height Ratio sits in the Health section next to free online waist-to-height ratio calculator and waist to height ratio calculator whtr health risk. The labels in Waist-to-Height Ratio match the terms in its result. Start with Waist-to-Height Ratio; the first number takes seconds.
Waist-to-height ratio (WHtR) from waist and height
Divide the waist measurement by height in the same units and the result is the waist-to-height ratio, a single number that tracks central fat without needing a scale. Guidance commonly treats 0.5 as the line to stay under, and the defaults here give WHtR = 0.47.
That sits in the healthy band, which runs from 0.40 up to 0.50.
The formula
WHtR = waist ÷ height, both in the same unit
Bands: under 0.40 very lean · 0.40–0.49 healthy · 0.50–0.59 increased risk · 0.60 and over high risk
80 ÷ 170 = 0.471. Because it is a ratio, the units cancel: 31.5 inches over 66.9 inches gives the same 0.47. Nothing is squared, so it is far more forgiving of measurement error than BMI.
Worked examples
80 / 170 = 0.47 healthy
76 / 170 = 0.45 healthy
90 / 170 = 0.53 increased risk
100 / 180 = 0.56 increased risk
80 / 160 = 0.50 at the threshold
65 / 170 = 0.38 very lean
Why it is a better screen than BMI
BMI cannot tell a 95 kg lifter from a 95 kg sedentary adult at the same height. Waist-to-height ratio measures where fat actually sits, and central fat — around the organs — is the kind associated with insulin resistance, raised triglycerides and cardiovascular risk. A 2017 review of over 300,000 adults found WHtR outperformed BMI and waist circumference alone at predicting cardiometabolic outcomes.
The simple rule that comes out of the research is to keep your waist under half your height. For a 170 cm adult that is 85 cm; for a 180 cm adult, 90 cm. It scales with frame, needs no lookup table by sex, and works the same in children, which is why paediatric clinics use it.
Measuring without fooling yourself
Measure at the midpoint between the lowest rib and the top of the hip bone, at the end of a normal breath out, with the tape snug and level all the way round. Do not pull the stomach in, and do not measure over clothing. Waist at the navel reads higher on most people; waist at the narrowest point reads lower. The midpoint is the standard.
Two limits are worth knowing. Very muscular adults can have a low ratio while carrying substantial visceral fat, and pregnancy makes the number meaningless. The ratio is also not a diagnosis — it flags risk that a clinician would confirm with blood pressure, lipids and glucose. Use a trend over months rather than a single reading, and pair it with waist-to-hip if your clinician asks for it.
Frequently Asked Questions
What is a healthy waist-to-height ratio?
Between 0.40 and 0.49. At 0.50 and above, central obesity risk rises; 0.60 and over is the high-risk band.
What waist should I aim for at 170 cm?
Under 85 cm, because the rule is half your height. At 80 cm you are at 0.47, comfortably inside the healthy band.
Is WHtR better than BMI?
For predicting cardiometabolic risk, generally yes. It captures where fat sits, while BMI cannot separate muscle from fat at the same height and weight.
Where exactly do I measure my waist?
At the midpoint between the lowest rib and the top of the hip bone, after a normal breath out, with the tape level and snug but not compressing the skin.
Does a low ratio rule out visceral fat?
No. A muscular adult can have a low ratio with high visceral fat, and pregnancy makes the measure unusable. It is a screen, not a diagnosis.
BMI Calculator and other Health tools
BMI Calculator · Pregnancy Due Date · Pregnancy Weight Gain · Fatigue Score Calculator · MET Value / Calories Burned · Pregnancy Trimester Calculator · Health Guides