Conicity Index Calculator

How it is calculated

The tool computes C = W / (0.109 × √(m / h)). W is waist circumference in metres, m is body weight in kilograms and h is height in metres. The constant 0.109 and the square root of weight over height give the waist a cylinder of that mass and height would have, so C is a dimensionless ratio of your waist to that reference cylinder, shown to two decimals.

All three values must be greater than zero. The tool gives only the number and no category, so you need a published reference table for your age and sex to interpret it. It is a screening-style index, not a diagnosis, and it assumes a body of average density.

Common mistakes

• Typing waist and height in centimetres. Both fields are in metres, so 85 cm is 0.85. Entering 85 and 175 produces a value over a thousand.
• Entering weight in pounds. The field is in kilograms.
• Measuring the waist at an inconsistent place. Use the same landmark each time, otherwise changes in the index may only reflect measuring differences.
• Expecting the index to behave like BMI. It is on a different scale, and typical values are around 1 or a little above rather than 20 to 30.
• Using one reading as a health verdict. The tool outputs a number only and does not diagnose; follow changes over time and discuss them with a clinician.