Waist-to-Height Ratio Calculator
Your waist-to-height ratio (WHtR) is one of the simplest ways to check health risk from belly fat. Divide your waist by your height: under 0.5 is the healthy target for adults. Enter both measurements to see your ratio, risk band and maximum healthy waist size.
A healthy waist-to-height ratio for adults is 0.40 to 0.49. The evidence-based public health rule recommended by NICE is to keep your waist circumference to less than half your height. Ratios from 0.50 to 0.59 indicate increased risk, and 0.60+ indicates high health risk.
Waist-to-Height Ratio (WHtR)
Healthy Ratio (0.40 – 0.49)Keep your waist to less than half your height. Your ratio of 0.46 means your waist is 46% of your height.
Max Healthy Waist
87.5 cm
Half of your height (0.50 limit)
Status vs Threshold
7.5 cm under limit
NICE 2022 recommendation
NICE (2022) Waist-to-Height Classifications
| WHtR Band | Classification | Clinical Context |
|---|---|---|
| < 0.40 | Take Care / May be underweight | Low visceral fat, monitor overall nutrition |
| 0.40 – 0.49 | Healthy Ratio | Lowest risk of cardiovascular and metabolic illness |
| 0.50 – 0.59 | Increased Health Risk | Moderate central adiposity; lifestyle changes advised |
| ≥ 0.60 | High Health Risk | High visceral fat; elevated risk of type 2 diabetes and hypertension |
Evidence from NICE Guideline NG246 indicates WHtR is a better predictor of early health risk than BMI alone.
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Clinical Equations
WHO, CDC, ACSM & Mifflin-St Jeor
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How to use Waist-to-Height Ratio Calculator
- 1Measure your waist midway between your lowest rib and the top of your hip bone.
- 2Enter your waist circumference in cm or inches.
- 3Enter your standing height in cm or feet/inches.
- 4View your WHtR ratio, NICE risk category, and maximum healthy waist threshold.
Why waist-to-height ratio beats BMI for central adiposity
BMI measures total body mass relative to height, but cannot identify where fat is stored. Visceral fat wrapped around abdominal organs is strongly linked to insulin resistance, type 2 diabetes, and cardiovascular disease.
The UK National Institute for Health and Care Excellence (NICE NG246) recommends WHtR as a superior early screening tool for central adiposity across all ethnic groups.
How to measure accurately
Stand upright, breathe out normally, and wrap a flexible tape measure halfway between the bottom of your lowest rib and the top of your pelvic hip bone (usually 1–2 cm above your navel). Do not compress the skin.
Frequently Asked Questions
What is a healthy waist-to-height ratio?
0.4 to 0.49 for adults. 0.5 to 0.59 means increased health risk and 0.6 or more means high risk, per UK NICE guidance.
Where do I measure my waist?
Halfway between the bottom of your lowest rib and the top of your hip bone, after breathing out normally.
Is WHtR better than BMI?
It's better at picking up belly fat, which is linked to diabetes and heart disease. Using both together is best.
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Scientific Sources & Evidence
- World Health Organization (WHO) — Body Mass Index Classification
- CDC Growth Charts — BMI-for-age LMS Percentiles
- Mifflin et al. (1990) — Basal Metabolic Rate Predictive Equations
- NICE Guideline NG246 — Identification and Management of Overweight and Obesity
- American College of Sports Medicine (ACSM) — Exercise Testing & Prescription
- European Food Safety Authority (EFSA) — Dietary Reference Values for Water