Stitch Per Inch (SPI) Calculator

Calculate stitches per inch and optimize stitch length for different fabric types and seam requirements.

Linear measurement in the specified unit.
mm
Linear measurement in the specified unit.
inches
Total weight or mass value. Convert between units as needed (1 kg = 2.2 lbs).
type

Results

Stitches per Inch:
Value expressed as a rate (per unit).
-SPI
Total Stitches:
Sum of all calculated values.
-stitches
Recommended SPI:
Suggested value based on calculations.
-SPI
Reference: Industry Standards.