Knitting Pattern Size Converter
Adjust knitting pattern stitch and row counts when your gauge differs from the pattern, or when you want to knit a different size. Enter pattern gauge, your actual gauge, and a list of stitch counts — get the adjusted numbers instantly. Works for all yarn weights and needle sizes. Private, no sign-up needed.
Enter Gauge & Pattern Details
How Knitting Pattern Conversion Works
A knitting pattern conversion adjusts stitch and row counts from one gauge to another, so your finished project comes out the same dimensions even when your personal knitting gauge differs from the pattern's required gauge. Gauge is expressed as the number of stitches and rows over 10cm (4 inches) of stockinette stitch. The conversion ratio is simply your gauge divided by the pattern's gauge: if the pattern requires 22 stitches per 10cm and your swatch shows 24 stitches per 10cm, your stitch ratio is 24÷22 = 1.091. Every stitch count in the pattern is then multiplied by this ratio and rounded to the nearest whole number.
Stitch and row ratios are calculated independently because tension in the horizontal direction (stitch gauge) is usually different from the vertical direction (row gauge). For a sweater body worked bottom-up, you multiply the stitch count for the cast-on by the stitch ratio, and multiply any row counts or length measurements by the row ratio. Always swatch with the exact needle size, yarn, and stitch pattern you plan to use in your project — gauge can differ between stockinette and cables, and between flat and in-the-round knitting.
When to Use Pattern Size Conversion vs Gauge Adjustment
Use gauge adjustment (this tool) when you want to knit the same physical size as the pattern but your personal gauge differs. Use size conversion when you want to knit a different finished size than the pattern offers — for example, scaling a child's sweater pattern up to an adult size. For size conversion, calculate the ratio of your desired measurement to the pattern measurement and multiply all stitch counts by that ratio instead.
Pattern repeats need special handling: if a stitch pattern repeats every 6 stitches (like a 3×3 rib), your adjusted cast-on must be a multiple of 6. Round your calculated count to the nearest multiple of the repeat. This calculator rounds to the nearest whole number or even number, but for ribbing and cables, always manually check that the result is compatible with your stitch pattern repeat.
Tips for Accurate Knitting Gauge
Cast on at least 30 stitches and knit at least 30 rows for your swatch — a larger swatch gives a more accurate gauge measurement. After knitting, wash and block the swatch the same way you plan to wash the finished project, as yarn can shrink, grow, or change texture after washing. Measure the gauge in the centre of the swatch, not near the edges. Measure at least three different spots and take the average. Last updated: March 2026.
Frequently Asked Questions
How do I convert a knitting pattern to a different size?
To convert a knitting pattern to a different size, calculate the ratio of your desired finished measurement to the original pattern's finished measurement. Multiply all stitch counts by this ratio and round to whole numbers (round to even numbers for symmetric patterns like ribbing). For example, if a pattern is written for a 40cm chest and you need 44cm, the ratio is 44÷40 = 1.1. A 120-stitch cast-on becomes 120 × 1.1 = 132 stitches.
How do I adjust a knitting pattern for my gauge?
First knit a gauge swatch — cast on at least 30 stitches and knit about 30 rows. Measure the number of stitches and rows over exactly 10cm. Divide your swatch gauge by the pattern gauge to get the conversion ratio. For example, if the pattern says 22 stitches per 10cm but your swatch gives 24 stitches per 10cm, your ratio is 24÷22 = 1.09, and you should multiply all stitch counts by this ratio and round.
Can I convert a pattern from US to UK sizes?
Yes — UK and US knitting patterns mainly differ in needle sizing (US 2 = 2.75mm, while UK 12 = 2.75mm), stitch terminology, and yarn weight names. The stitch counts and instructions are the same; only the needle size notation differs. This calculator handles the gauge-based stitch adjustment. For needle sizes, use a needle size conversion chart to match the correct mm size.
What is a gauge swatch and why do I need one?
A gauge swatch is a small knitted sample you make before starting a project to check your personal stitch gauge against the pattern's required gauge. Your gauge depends on your yarn, needle size, knitting tension, and stitch pattern. Even if you use the suggested needle size, your gauge may differ. Without checking gauge, your finished project may come out the wrong size. Always wash and block your swatch before measuring, as many yarns change size after washing.
What should I do if I can't match the pattern gauge?
If your gauge is tighter (more stitches per 10cm than the pattern), try using larger needles. If your gauge is looser (fewer stitches), try smaller needles. If you cannot match gauge even after changing needle size, use this calculator to adjust all stitch and row counts proportionally for your actual gauge. For garments and fitted items, matching or adjusting for gauge is critical. For scarves, blankets, and shawls, a small gauge difference is less critical.