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Waist to Height Ratio
The measure BMI structurally cannot give you.
What it does. Divide your waist circumference by your height in the same units. The widely cited guide is to keep your waist under half your height — a ratio below 0.5. Unlike BMI it captures where fat sits, which carries more cardiometabolic risk than how much there is.
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How to use Waist to Height Ratio
- Measure your waist at the navel, breathing out normally.
- Enter it with your height in the same units.
- Read the ratio against the boundaries.
Why where fat sits matters more than how much
Fat stored around the abdomen — particularly visceral fat around the organs — is metabolically active in a way that fat on hips and thighs is not. It is more strongly associated with insulin resistance, blood lipid changes and cardiovascular risk.
BMI cannot see this at all. Two people at an identical BMI can carry very different risk depending on distribution.
This is why waist-to-height ratio often outperforms BMI in studies predicting cardiometabolic outcomes, despite needing only a tape measure.
The boundaries
| Ratio | Reading |
|---|---|
| Below 0.40 | Below the usual range |
| 0.40 – 0.49 | Healthy |
| 0.50 – 0.59 | Increased — worth attention |
| 0.60 and over | Substantially increased |
The half-your-height rule scales naturally with body size, which is the practical advantage over BMI: it needs no separate chart for tall or short people, and the same threshold works for adults across heights.
Measuring the waist correctly
Measure at the navel, standing relaxed, tape snug but not compressing, at the end of a normal breath out. Not the trouser size — clothing sizes are inconsistent between makers and typically flatter.
Take it at the same time of day; abdominal circumference genuinely changes over a day with food and fluid.
Do not brace or hold your breath. The most common measurement error here is unconscious bracing, which can take several centimetres off and quietly move you a category.
Frequently asked questions
What is a healthy waist to height ratio?
Below 0.5 — keep your waist under half your height. Between 0.5 and 0.59 suggests increased cardiometabolic risk, and 0.6 or above substantially increased.
Is waist to height ratio better than BMI?
For cardiometabolic risk it often performs better, because it captures where fat sits. BMI cannot distinguish distribution at all, and two people at the same BMI can carry very different risk.
Where exactly do I measure my waist?
At the navel, standing relaxed, at the end of a normal breath out, with the tape snug but not compressing. Not your trouser size — clothing sizing is inconsistent and usually flatters.
Does the unit matter?
No, as long as both measurements use the same one. It is a ratio, so centimetres over centimetres and inches over inches give the identical answer.
Does this apply to children?
The 0.5 guide is often cited for children over about five as well, but paediatric assessment properly uses age-and-sex percentiles. Treat this as an adult measure.