How to use it
- Choose the conversion direction.
- Enter either SPI or stitch length in millimeters.
- Convert to see both representations.
Stitches Per Inch Converter
Convert between stitches per inch and the corresponding average stitch length.
About the Stitches Per Inch Converter
Relate a stitch count over one inch to an average distance between stitches.
Formula
Stitch length in millimeters equals 25.4 divided by SPI. In reverse, SPI equals 25.4 divided by millimeters.
Example
Ten stitches per inch corresponds to an average stitch length of 2.54 mm.
Notes
This is a mathematical average. Real seams may vary with feeding, fabric, tension and measurement method.