Guide topic
Leatherworking
Plain-English, practitioner-cited guides to hand-stitched leather.
Guide
Stitches per inch by leather weight
Match SPI to leather weight and project, the SPI-to-millimeter conversion, and why proportion matters.
Read guide →
Guide
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.
Read guide →
Buying guide
The best leatherworking tools (2026)
the pricking irons, thread, and edge tools worth buying first.
Read guide →
The app for this
Hide: Leatherworking Calculator
SPI, thread length, edge, glue, and dye — sized to your leather weight and project, with brand-aware presets. Free to download.