Paper & Bookbinding Tools
Boxes cut from sheets, sheets wrapped round boxes and sheets folded into books — where the exact answers are prettier than the rules of thumb.
The corner square to cut from a sheet for the largest folded box — exactly a sixth of the side on a square, and a flat peak either way.
Gift Wrap Size CalculatorThe sheet a box actually needs, all three ways round — and why which orientation wins depends on how you fold the ends.
Bookbinding Signature CalculatorSignatures, blank pages and push-out for a folded book — where a bigger signature wastes more paper, not less.
Quilling Strip Length CalculatorStrip length for a rolled coil — the ring area over the paper thickness, which means the length goes as the diameter SQUARED.
Calligraphy Guideline CalculatorGuideline heights from nib widths — and why five nib widths is a ratio rather than a size, spanning ten times the height across common nibs.
Modular Origami Unit CalculatorUnits for a modular polyhedron from faces and vertex degree — checked by Euler, and reported for all three module conventions.