Knitting Gauge Calculator
Compare your gauge swatch to the pattern gauge and get adjusted stitch and row counts.
This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
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Gauge is the most important measurement in knitting. If your gauge does not match the pattern, your finished piece will be the wrong size. This calculator adjusts for the difference between your gauge and the pattern gauge so you can cast on the right number of stitches.
- Knit a gauge swatch. Cast on at least 20 stitches using your chosen yarn and needles. Knit 4 inches of rows, then bind off. Block the swatch the same way you will block the finished piece. Count the stitches and rows in a 4" section and divide by 4 to get your stitches and rows per inch.
- Enter both gauges. Input the pattern's stated gauge (from the pattern booklet, usually in stitches per 4") and your measured gauge from the swatch.
- Enter your target dimensions. Use the finished measurements from the pattern (the width and height in inches you want to achieve).
- Read the adjusted counts. The calculator shows how many stitches to cast on and how many rows to knit to achieve your target dimensions at your actual gauge.
About the Knitting Gauge Calculator
The adjusted stitch count is calculated by first determining what the pattern would say to cast on (target width times pattern gauge), then scaling that by the ratio of pattern gauge to your gauge. If your gauge is tighter than the pattern (more stitches per inch), you need to cast on fewer stitches to get the same width. If your gauge is looser, you need more stitches. The needle advice feature compares your gauge to the pattern gauge and suggests going up or down a needle size when the difference exceeds half a stitch per inch.
Frequently Asked Questions
What is gauge in knitting and why does it matter?
Gauge is the number of stitches and rows per inch (or per 4 inches) you produce with a specific yarn, needle size, and knitting tension. It matters because if your gauge is off from the pattern gauge, your finished piece will be a different size than intended. A sweater that should be 20" wide might come out 18" or 22" depending on your gauge. The only way to fix a gauge mismatch is to swatch, measure, and either adjust needle size or use this calculator to adjust stitch counts.
My gauge is close but not exact. Should I still adjust?
Yes, especially for fitted garments. Even a difference of half a stitch per inch adds up over a 20" width — that is 10 extra stitches across the front of a sweater, which translates to about 1.5" difference in total width. For accessories like hats and scarves, a small gauge difference is usually acceptable. For sweaters, shawls, or anything that needs to fit precisely, always adjust. Use this calculator to find the exact cast-on for your gauge.
How do I measure my gauge accurately from a swatch?
Cast on at least 30 stitches to give yourself a wide enough sample. Knit at least 4 inches of length. Bind off and block the swatch the same way you will block the finished piece (wet blocking changes gauge significantly for natural fibers). Lay the swatch flat and use a ruler or gauge tool to count stitches in a 4-inch span across the middle of the swatch, away from the edges. Divide by 4 to get stitches per inch. Repeat for rows vertically.
Can I use this calculator for adjusting a specific pattern's cast-on numbers?
Yes. Enter the pattern's gauge, your gauge, and the finished width the pattern is trying to achieve. The calculator gives you the adjusted cast-on count. Keep in mind that patterns often have stitch count requirements for stitch patterns (multiples of 4, 6, etc.), so round your adjusted number to the nearest valid multiple. Also adjust the row counts similarly for length-related shaping instructions.