Chest-to-Waist Ratio Calculator

Chest-to-waist ratio divides chest circumference (measured at the nipple line, tape level and snug but not compressed) by waist circumference (at the navel). It captures taper using the chest rather than the shoulders, which the Adonis Index and V-Taper tool measure instead - the three are related but not identical, since chest width, shoulder width and waist size can move somewhat independently.

This ratio also feeds directly into body-shape classification: a high chest-to-waist ratio reads as trapezoid or inverted-triangle, while a ratio near 1 reads as rectangle or oval. See the Body Shape Detector for the full picture including hips.