Waist-to-height ratio calculator
Calculate waist circumference divided by height. Each measurement can be entered in centimeters or inches.
Formula & units
Waist-to-height ratio = waist circumference ÷ height
Convert both lengths to the same unit first. For waist measurement, place a level tape halfway between the lowest ribs and the top of the hip bones, then measure after a normal exhalation without drawing in your abdomen.
Worked example
Waist 85 cm and height 170 cm give a waist-to-height ratio of 0.500.
What the result can tell you
This adult measurement tool reports a ratio, not a diagnosis or body-fat percentage. NICE uses waist-to-height alongside BMI in adults with BMI below 35 kg/m²; discuss its relevance to your circumstances with a clinician.
Read the interpretation guide →
Sources for this method
Questions about Waist-to-height
Where should I measure my waist?
Place a level tape midway between the lowest ribs and the top of the hip bones. Read the measurement after breathing out normally.
Source: NICE NG246 · Measuring waist-to-height ratio (opens in a new tab) · Related calculator → · Link to answer
Can I use inches for waist-to-height ratio?
Yes. Both lengths must use the same unit in the equation. This calculator converts each input to centimeters before dividing waist by height.
Source: NICE NG246 · Measuring waist-to-height ratio (opens in a new tab) · Related calculator → · Link to answer
Is waist-to-height ratio a body-fat percentage?
No. A ratio of 0.5 means waist circumference is half the height; it does not mean 50% body fat.
Source: NICE NG246 · Measuring waist-to-height ratio (opens in a new tab) · Related calculator → · Link to answer
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