Boning Calculator — Corset & Bodice Boning

A traditional corset uses 10-14 bones. Typically: 2 at centre back (either side of lacing), 2 at centre front, 2 at each side seam, and 2-4 more distributed between. More bones provide better support and smoother shaping.

Spiral steel: flexible, curves with the body, best for corsets. Flat steel: rigid, prevents folding, good for centre front. Plastic/Rigilene: lightweight, for strapless dresses and light support. Synthetic whalebone: medium support.

Measure the seam or channel where the bone will sit. Subtract 1-2cm from each end so the bone does not poke through. Cap steel bones with tip caps to prevent fabric damage.

If sewing boning directly into seam allowances, no casing is needed. For surface channels, use boning casing tape (pre-made channels). Cut casing 2cm longer than the bone for folding the ends.