Leatherworking
Plain-English, practitioner-cited guides to hand-stitched leather.
Guides
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Stitches per inch by leather weight
Match SPI to leather weight and project, the SPI-to-millimeter conversion, and why proportion matters.
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How much thread for a saddle stitch
The cut-length rule of thumb, why thickness and SPI change it, and how to avoid running short mid-seam.
Hide: Leatherworking Calculator
SPI, thread length, edge, glue, and dye — sized to your leather weight and project, with brand-aware presets. Free to download.