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Leather Stitch Spacing Calculator

Lay out pricking-iron holes along a strap with even end borders, or space them exactly end to end, and find the thread length to cut.

millimetres from the first hole to the last hole
millimetres between holes; 3, 4 and 5 mm irons are common
balanced keeps the iron pitch and splits the leftover length
multiples of the stitched length; saddle stitching is about 3.5×
Enter the stitch line and iron pitch to see the hole plan.

End borders are measured from the leather's edge to the centre of the first and last hole. Balanced layout keeps your iron's pitch, so holes stay on the iron's teeth and the leftover length becomes two equal borders. Exact even spacing keeps the hole count and stretches or compresses the pitch so both end holes sit on the marked ends; check the adjusted pitch before marking. The thread figure is a cutting allowance, not a guarantee: add a little for starting, finishing and thick leather. For a closed loop, leave the join at one end instead of splitting the border. Everything runs in your browser with no storage, uploads or network access.