Leathercraft calculators
Free, no-signup tools that answer the three questions every beginner hits: what stitch and thread to use, how much leather to buy, and how thick it should be.
CalculatorStitch pitch converter & thread matcherConvert mm to stitches per inch and match thread + irons.CalculatorLeather project calculatorSquare feet, cut and thickness for any project.CalculatorThread length estimatorHow much thread to cut for a saddle stitch.CalculatorLeather thickness converter (oz ↔ mm)Ounces to millimetres and inches, with a full chart.CalculatorBelt size & strap length calculatorBelt size, blank length and hole layout.CalculatorRivet & Chicago screw length calculatorRight rivet post & Chicago screw for your leather.CalculatorNeedle & thread size selectorMatch needles to thread in mm, Tex or pitch.