Worried you might run out of thread before you finish, or not sure how much to cut?
Use our Thread Length Calculator to estimate the right amount for your stitch line, based on your pricking-iron spacing and project measurements. Treat it as a practical guide, with a little extra allowed for needles, backstitching and finishing.
Stitch Setup
All layers combined for the seam you are stitching
Seam Length
Measure one side of the seam
Auto-calculated — or enter if you’ve counted
Calculation Breakdown
Visible thread
Stitch line length (front and back is covered by the × 2 below)
—
Hidden thread
Hole count × leather thickness
Finishing thread
Working tail for backstitching
200 mm
Sub total (× 2 for two threads)
Each of the above, doubled for saddle stitching
—
Thread length required
—mm
Always round up. A long thread is recoverable — a short one isn’t. Softer leather tends to leave more thread in reserve; firm or bridle leather less so.
Visible + Hidden + Finishing = Sub total · × 2 = Thread length required