1. Ramanujan's Approximation: Because the torso is an ellipse, we use the semi-major axis (a) and semi-minor axis (b) to calculate circumference (C).
2. Delta & Cup Size: We run this for Bust and Underbust. The difference (Δ) dictates cup volume.
How "Three Sizes" Work
We use the same ellipse geometry but apply it to three zones to generate the classic B-W-H anime stats.
Waist: Measure the absolute narrowest point of the abdomen.
Hips: Measure the absolute widest point of the pelvis and furthest protrusion of the glutes.
2. Measurement Settings
2px
Settei Geometry
Show All Lines: Displays all measurement lines on the canvas to give you a full overview of the geometry. Use this to double-check that your front and side measurements perfectly align horizontally.