Waist-to-Height Ratio Calculator
Quick answer
Measure your waist and your height in centimetres or inches and this calculator works out your waist-to-height ratio (WHtR) — the “keep your waist under half your height” test now used in UK clinical guidance (NICE NG246).
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The waist-to-height formula
WHtR = waist circumference ÷ height
Both measurements must use the same unit (cm or inches)
The goal: a ratio under 0.5 — waist less than half your height
NICE thresholds: under 0.5 healthy, 0.5–0.59 increased risk, 0.6+ high risk. The guidance applies to adults with a BMI under 35 kg/m².
Worked example
- 1
A woman is 165 cm tall with a waist of 74 cm.
- 2
WHtR = 74 ÷ 165 = 0.45.
- 3
Below 0.5 → her waist is less than half her height, so she sits in the healthy range.
Interpreting your waist-to-height ratio
| Your result | Category | What it means |
|---|---|---|
| Under 0.5 | Healthy — no increased risk | Your waist is less than half your height. This sits in the healthy range used by NICE for most adults. |
| 0.5 – 0.59 | Increased risk | Your waist is at least half your height. NICE classifies this as an increased risk to health — a good prompt to focus on nutrition and daily movement. |
| 0.6 or more | High risk | NICE classifies this as a high risk to health. Talking to a healthcare provider about a structured plan is worth doing. |
NICE guideline NG246 (2022): thresholds for central adiposity and health risk. Apply to people with a BMI under 35 kg/m².
Frequently asked questions
Sources & further reading
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Open the logThis calculator provides general estimates for informational purposes only and is not medical advice. For personal guidance, consult a qualified healthcare provider.