# Break load and strength-to-weight calculator

> Compare tensile and weight of a CCS build against its solid-copper equivalent at equal diameter.

## Verified anchors

Tensile bands: 21% IACS 1200-1400 MPa, 30% 900-1100 MPa, 40% 700-900 MPa, 55% 600-800 MPa.
Weight: copper density 8.89 g/cm³ (IEC 60028); the CCS build is lighter than the equal-area solid-copper reference by its steel fraction.

Interactive tool: /tools/calc-strength-weight/