Knitting Gauge Calculator
Gauge is the foundation of knitting accuracy. When your stitch gauge differs from the pattern's, every measurement in the pattern is off by a proportional amount. The fix is to adjust the stitch and row counts so that your fabric ends up the same size as the designer intended. The adjustment formula is simple: multiply the pattern stitch count by the ratio of your gauge to the pattern gauge. If the pattern calls for 120 stitches at 20 stitches per 4 inches and your gauge is 18 stitches per 4 inches, you need 120 multiplied by 18 divided by 20, which is 108 stitches, to produce the same width. The same ratio applies to row counts. This calculator also tells you how many stitches to cast on for any desired finished width at your gauge, which is useful when designing or sizing custom garments. The Craft Yarn Council recommends always knitting a gauge swatch of at least 4 by 4 inches, blocking it the same way you plan to treat the finished project, and measuring in the centre of the swatch rather than at the edges.
Adjusted stitch count: -- | Adjusted row count: --
Pattern gauge
Your gauge (from swatch)
Pattern counts to adjust
Gauge adjustment formulas
adjusted_stitch_count = pattern_stitch_count x (your_sts_per_4in / pattern_sts_per_4in) adjusted_row_count = pattern_row_count x (your_rows_per_4in / pattern_rows_per_4in) cast_on_stitches = desired_width_in x (your_sts_per_4in / 4)
Round stitch counts to whole numbers. For garments with ribbing or pattern repeats, round to the nearest multiple of the repeat.
Needle size tip
If your stitches per 4 inches are more than the pattern gauge, your knitting is too tight: try a larger needle. If your stitches per 4 inches are fewer than the pattern gauge, your knitting is too loose: try a smaller needle. The calculator shows a recommendation in the result panel.
Craft Yarn Council gauge categories
| Weight category | Stitches per 4 in | US needle size |
|---|---|---|
| 0 Lace | 32–42 | 000–1 |
| 1 Super Fine | 27–32 | 1–3 |
| 2 Fine | 23–26 | 3–5 |
| 3 Light (DK) | 21–24 | 5–7 |
| 4 Medium (Worsted) | 16–20 | 7–9 |
| 5 Bulky | 12–15 | 9–11 |
| 6 Super Bulky | 7–11 | 11–17 |
| 7 Jumbo | 6 or fewer | 17+ |
Knitting gauge: frequently asked questions
Why does gauge matter in knitting?
Gauge is the number of stitches and rows per inch or per 4 inches produced by a specific yarn and needle combination for a particular knitter. Because every knitter's tension is slightly different, two people using the same yarn and needles will produce fabric of different sizes. Checking your gauge against the pattern's gauge and adjusting accordingly is the only reliable way to ensure your finished project matches the intended dimensions.
How do I measure my gauge swatch?
Cast on at least 20 stitches and knit at least 4 inches in the pattern stitch specified in the pattern (usually stockinette). Bind off, block, and let the swatch dry completely. Measure 4 inches across the middle of the swatch with a ruler or gauge tool. Count the stitches within that 4-inch span. Do the same vertically for rows. Measuring in the middle avoids distortion at the edges.
What do I do if my gauge does not match the pattern?
If you have more stitches per 4 inches than the pattern calls for, your knitting is too tight. Go up one needle size and swatch again. If you have fewer stitches, your knitting is too loose; go down one needle size. Repeat until your gauge matches, or use this calculator to adjust the stitch and row counts for the pattern to suit your gauge.
Can I knit a pattern at a different gauge and still get the right size?
Yes, by scaling the stitch and row counts. This calculator multiplies the pattern's stitch count by the ratio of your stitches per 4 inches to the pattern's stitches per 4 inches. The result is the number of stitches you need to produce the same width. Apply the same logic to rows for the same length. Be aware that some patterns have complex shaping that requires more careful adjustment.
How many stitches do I cast on for a specific width?
Multiply the desired width in inches by your stitch gauge (stitches per inch, which is your stitches per 4 inches divided by 4). For example, if your gauge is 20 stitches per 4 inches (5 stitches per inch) and you want a finished width of 18 inches, cast on 18 x 5 = 90 stitches. This calculator performs that calculation in the 'cast-on for desired width' field.
Sources and methodology
- Craft Yarn Council knitting gauge standards: CYC Knit Gauge.
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. Always knit a gauge swatch and adjust needle size before starting a project. See our methodology.