Waist-to-Height Ratio Calculator
Calculate your waist-to-height ratio (WHtR) in cm or inches and see your health risk band. Simple rule: keep your waist under half your height.
About the Waist-to-Height Ratio Calculator
The waist-to-height ratio (WHtR) is one of the simplest screening numbers in health: waist circumference divided by height, both in the same unit. This calculator takes your two measurements — in centimetres or inches — and instantly shows the ratio along with the general risk band it falls into. The memorable rule of thumb: keep your waist to less than half your height.
Research increasingly finds WHtR a better early-warning signal for heart disease and type-2 diabetes risk than BMI, because it captures abdominal fat directly — a person can have a normal BMI yet carry excess fat around the waist, a pattern common in South Asian populations. Commonly used bands: below 0.40 may indicate a very slim build, 0.40–0.49 is the healthy range, 0.50–0.59 signals increased risk, and 0.60 or above signals high risk.
Measure your waist at the midpoint between the bottom rib and the top of the hip bone, after a normal breath out. For example, an 80 cm waist on a 170 cm frame gives 80 ÷ 170 = 0.47 — inside the healthy band. This is a screening guide, not a diagnosis; discuss concerning results with a doctor.
How to Use the Waist-to-Height Ratio Calculator
- 1Choose your units — centimetres or inches.
- 2Enter your waist circumference, measured midway between the bottom rib and hip bone.
- 3Enter your height in the same unit.
- 4Read your ratio and the risk band it falls into.
Frequently Asked Questions
How do I calculate my waist-to-height ratio?
Divide waist circumference by height in the same unit. An 80 cm waist with 170 cm height gives 80 ÷ 170 = 0.47. In inches the math is identical: a 32-inch waist at 5'7" (67 inches) gives 32 ÷ 67 = 0.48.
What is a healthy waist-to-height ratio?
Roughly 0.40 to 0.49 for adults. From 0.50 the risk of cardiometabolic disease starts rising — hence the rule 'keep your waist less than half your height' — and 0.60 or above is considered high risk in most published charts.
Is waist-to-height ratio better than BMI?
For screening abdominal fat, often yes. BMI cannot tell muscle from fat or see where fat sits, while WHtR directly captures central fat, which drives most metabolic risk. This matters especially for South Asians, who tend to carry more abdominal fat at the same BMI. Best practice is to look at both numbers.
How do I measure my waist correctly?
Stand relaxed, find the midpoint between your lowest rib and the top of your hip bone (roughly at the navel for many people), wrap the tape snugly but not tight, and read after breathing out normally. Measuring over thick clothing or after a large meal inflates the number.
My ratio is 0.55 — what should I do?
A ratio of 0.55 sits in the increased-risk band (0.50–0.59). It is a nudge, not a diagnosis: gradual waist reduction through diet and activity moves the ratio down directly — dropping a 93 cm waist to 84 cm at 170 cm height moves you from 0.55 back to 0.49. Consult a doctor for personal guidance.