Free calculator
Waist-to-Height Ratio Calculator
Compare your waist measurement with your height.
Before you use the calculator
What is this calculator for?
Waist-to-height ratio compares your waist measurement with your height. It is a simple way to look at central fat distribution — particularly fat carried around the abdomen, which can be associated with higher cardiometabolic risk. It is often useful alongside BMI because two people with the same BMI can carry weight very differently.
What it measures
- Waist circumference
- Height
- Waist-to-height ratio
Why it is here
It can give an additional perspective on health risk linked with abdominal fat and may be useful for tracking changes even when the scales move slowly.
What this result cannot tell you
No calculator can understand everything about you. Important limitations include:
- Pregnancy
- How accurately the waist is measured
- Body shape differences
- Certain medical conditions
- It does not directly measure visceral fat or diagnose disease
If your waist is shrinking while the scales are being stubborn, that can still be meaningful progress. Do not let one number hog all the attention.
How to use the result sensibly
Use the number as a starting point. Look at the overall trend, how you feel, what is happening with your waist, movement, sleep, blood pressure and other relevant health markers. Where the result is unexpected, concerning or difficult to interpret, a qualified healthcare professional can put it into context.
Industry-standard does not mean individually perfect. These calculators use recognised methods because they are useful, not because they can define a person. Results are informational, subjective in context and open to interpretation.
What should I do next?
How this works, limitations & evidence
Interpretation, limitations & evidence
Understand the result — then decide what matters
Waist-to-height ratio adds information about central fat distribution to BMI. NICE recommends it particularly for adults with BMI under 35.
How the ratio works
Waist-to-height ratio = waist circumference ÷ height, using the same units for both.
Example: 90 cm waist ÷ 180 cm height = 0.50.
NICE interpretation
| Ratio | NICE interpretation |
|---|---|
| 0.40–0.49 | Healthy central adiposity / no increased risk from this measure |
| 0.50–0.59 | Increased health risk |
| 0.60+ | Further increased health risk |
The simple message is: aim to keep your waist less than half your height.
How to measure consistently
Use a flexible tape on bare skin, keep it level and measure in the same anatomical position each time. For personal tracking, consistency is more useful than chasing millimetre precision.
Why waist matters
Higher central adiposity is associated with increased risk of type 2 diabetes, hypertension and cardiovascular disease. Waist therefore gives information that body weight alone cannot.
When the ratio is especially useful
It can add context when BMI is borderline, when weight changes slowly but waist is falling, or where high muscle mass makes BMI harder to interpret.
Do not obsess over millimetres
Tape placement, breathing and time of day can create variation. Review trends over weeks rather than repeatedly re-measuring until you get the number you want.
Common questions
Is waist-to-height better than BMI?
It answers a different question; using both can give more context.
Does NICE use it above BMI 35?
NICE specifically recommends it as an additional measure particularly when BMI is under 35.
How often should I measure?
Every few weeks is usually enough for weight-management tracking.
What should I use next?
Sources & methodology
We use UK guidance and primary research where appropriate, and disclose when a result is an estimate rather than a clinical threshold.
Use this page as information, not judgement. The best next step is the one that actually fits your health, your life and what you are ready to change.
Written and editorially reviewed by the Shift Some Timber. Editorial review is not clinical review. Health content is checked against recognised UK guidance and primary sources where appropriate.
Last reviewed: 8 August 2026. This page is informational and does not replace individual medical advice.