Knitting Gauge Swatch Calculator
Measure your swatch, get your gauge, and adjust your cast-on count to match any pattern.
Enter your swatch measurements to calculate your gauge.
How to Use This Calculator
Measuring Your Swatch
- Knit a swatch at least 6"×6" using your project yarn and needles in the stated stitch pattern.
- Wash and block the swatch before measuring — many yarns change size significantly after washing.
- Place the swatch flat. Measure from the center, avoiding the edges (which are less accurate).
- Count stitches and rows within a 4" area for the most accurate result.
Adjusting for a Pattern
- Patterns state gauge as "X stitches over 4 inches" — enter that in the Pattern Gauge field.
- Enter your swatch gauge in the Your Gauge field.
- Enter either the pattern's cast-on count or your desired finished width.
- The calculator will tell you how many stitches to cast on to achieve the correct size.
What the Percentage Difference Means
- 0%: Your gauge matches exactly — use the pattern as written.
- +5% or more: Your gauge is tighter — try one needle size larger.
- -5% or more: Your gauge is looser — try one needle size smaller.
- Differences over 10% may affect drape and fabric quality even after adjustment.
Results are estimates. Gauge, yarn, and needle type affect actual results. Always swatch before starting a garment.
About this Knitting Gauge Swatch Calculator
Use this free Knitting Gauge Swatch Calculator to get quick, accurate results directly in your browser. It is designed for everyday use with no signup, no downloads, and no account required. No signup is required, and the tool works on phones, tablets, and desktop browsers.