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Stitch Density (SPI/CPI)

Calculate stitches per inch and courses per inch

How It Works

Calculate stitches per inch (SPI) for woven fabrics or courses per inch (CPI) for knit fabrics.

Stitch density defines the number of stitches per unit length and directly impacts fabric strength, elasticity, and appearance. Higher SPI means tighter stitching and stronger seams, while lower SPI gives more flexibility and softer fabric hand.

In woven fabrics, SPI (stitches per inch) is measured along the warp or weft direction. In knit fabrics, CPI (courses per inch) measures horizontal rows of loops. Standard SPI ranges vary by fabric type: 8-12 (denim), 10-14 (shirting), 14-18 (fine apparel). Stitch density is widely used in sewing quality control and machine setting adjustment.

Results

Enter values to see results

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Quick Tips

  • • Results update automatically as you type
  • • Use Tab to navigate between fields
  • • Press Enter to calculate

Frequently Asked Questions

How does the Stitch Density (SPI/CPI) work?
Simply enter your values into the input fields above. The Stitch Density (SPI/CPI) uses standard formulas to compute results instantly as you type or click.
Is the Stitch Density (SPI/CPI) free?
Yes, this calculator is completely free to use. No registration, no hidden fees, no limits.
How accurate are the results?
Results are computed using industry-standard mathematical formulas. For critical decisions, we recommend consulting a professional.
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