Jewelry & Leather Tools
Blank lengths, aspect ratios and thread paths — the geometry that decides whether a ring closes at the size you wanted.
Ring Blank Length Calculator
The strip length to cut for a ring, measured at the neutral axis — and why cutting to the inside circumference finishes a whole thickness small.
Jump Ring Aspect Ratio CalculatorAspect ratio and wire length for chainmaille rings, on both conventions — which differ by exactly two, and nobody says which they mean.
Saddle Stitch Thread CalculatorThread for a saddle-stitched seam traced along the path it takes — the four-times rule is one point on a curve, not a rule.