Waist-to-Height Ratio Calculator
Assess central fat risk from waist and height.
Results update as you type.
This calculator provides estimates based on population research. Results are not medical advice. Consult a qualified healthcare provider before making health or nutrition decisions.
How it works
The waist-to-height ratio divides your waist circumference by your height, and it has emerged as one of the simplest yet most powerful screens for the health risks tied to central body fat. Unlike body mass index, which cannot tell where fat sits, this ratio zeroes in on abdominal fat, the visceral kind that wraps around organs and is most strongly linked to heart disease, type 2 diabetes and metabolic syndrome. A waist-to-height ratio calculator turns two tape measurements into a single number you can interpret at a glance. The guiding rule, popularised by researchers and adopted in several national guidelines, is memorably simple: keep your waist to less than half your height. A ratio below 0.5 is generally considered healthy, values from 0.5 to 0.6 signal increased risk, and above 0.6 marks high risk, while an unusually low value may reflect being underweight. Because both measurements share the same unit, the ratio works identically whether you measure in centimetres or inches. Clinicians and researchers favour a waist-to-height ratio calculator because studies repeatedly find it predicts cardiometabolic outcomes as well as or better than BMI, yet it needs only a tape measure. Measure your waist at the midpoint between the lowest rib and the top of the hip bone, snug but not compressing, after a normal exhale, and treat the result as a screening prompt rather than a diagnosis.
Ratio = waist ÷ height (same unit); healthy when below 0.5
The ratio simply divides waist by height, so it is dimensionless and works in any consistent unit. It improves on waist circumference alone because a given waist means something different on a tall versus a short person; scaling by height normalises for body size. The 0.5 threshold reflects large-population evidence that carrying a waist wider than half your height sharply raises cardiometabolic risk.
Source:Standard health guidance
We review all our tools from time to time to ensure accuracy.
Worked example
How to use this calculator
- 1
Enter your values
Enter waist and height.
- 2
Adjust the options
Fine-tune any options to match your situation.
- 3
Read your result
Waist-to-height ratio updates instantly as you type — no button to press.
Frequently asked questions
Why is waist-to-height ratio better than BMI?
BMI uses only weight and height, so it cannot distinguish muscle from fat or tell where fat is stored. Waist-to-height ratio directly reflects abdominal fat, the visceral fat most strongly tied to heart disease and diabetes. Many studies find it predicts these outcomes as well as or better than BMI, and it flags risk in people whose BMI looks normal but who carry excess weight around the middle.
What is a healthy waist-to-height ratio?
The widely used guide is to keep your waist under half your height, so a ratio below 0.5 is considered healthy for most adults. Values from 0.5 to 0.6 indicate increased risk, and above 0.6 signals high risk. A ratio well below 0.4 may suggest being underweight. These bands apply broadly across sexes and ethnicities, which is part of the measure's appeal.
Where exactly should I measure my waist?
Measure at the midpoint between the bottom of your lowest rib and the top of your hip bone, which is usually roughly at or just above the navel. Keep the tape horizontal and snug against the skin without compressing it, and take the reading after breathing out normally. Measuring on bare skin at the same point each time gives the most consistent and comparable results.
Does the ratio work for all body types?
The waist-to-height ratio is more consistent across different heights, sexes and ethnic groups than waist circumference alone, which is a major strength. It does have limits: it is less validated for pregnant women, growing children and highly muscular athletes with large waists from muscle rather than fat. For the general adult population, though, it is a robust and simple screening tool that needs no adjustment by group.
Can I lower my waist-to-height ratio?
Yes. Because the height part is fixed, the ratio falls as your waist shrinks, which happens when you lose abdominal fat. A modest calorie deficit, regular aerobic and resistance exercise, adequate sleep and limiting refined sugar and alcohol all help reduce visceral fat over time. Even a few centimetres off your waist meaningfully improves the ratio and, more importantly, the underlying metabolic risk it reflects.