Knitting & Crochet Pattern Maths
Calculate knitting gauge swatch conversions, total yarn yardage and skeins needed, and even row increase/decrease repeats. 100% offline craft calculator.
Pattern Specified Gauge (per 4" / 10cm)
Your Actual Swatch Gauge (per 4" / 10cm)
Adjusted Pattern Calculations
Adjusted Pattern Prescription
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🧶 Never Skip the Washed & Blocked Swatch
Yarns made of wool and alpaca "bloom" and relax significantly after washing and wet blocking. A dry swatch measuring 20 sts / 4" might easily expand to 18 sts / 4" when dried flat. Always wash and dry your gauge swatch before measuring to guarantee your finished sweater doesn't turn out two sizes too large!
About this tool
How to use it
- Select your calculation module: 'Gauge Swatch Converter', 'Yarn Yardage & Skeins', or 'Even Stitch Adjuster'.
- For Gauge: Input pattern gauge vs your measured swatch gauge (per 4 inches / 10 cm) and target width.
- For Yarn: Pick your project type and yarn weight to calculate total yardage and whole skeins to buy.
- For Stitch Adjuster: Enter starting stitches and target stitches to get exact knit/increase/decrease repeat instructions.
- Review the resulting garment dimension variance and needle size adjustment recommendations.
Why it matters
Hand-knitting tension varies between crafters by up to 25%. Blindly following a sweater pattern's cast-on count when your gauge is off by just 1 stitch per 4 inches will produce a garment that is either baggily oversized or unwearably tight. Mathematical recalibration ensures perfect fit before investing 40+ hours of hand knitting.
When to use it
Use this tool before casting on any garment, substituting yarns with different ball yardages, or adjusting neckline and ribbing stitches.
Good to know
Calculations comply with Craft Yarn Council (CYC) yarn weight standards and standard tailoring proportions.
Common questions
Why is a gauge swatch so important?
Even when using the recommended needle size, personal hand tension varies. On a 40-inch sweater, being off by just 1 stitch per 4 inches changes the final chest width by 2 full inches (a whole clothing size).
How much extra yarn buffer should I buy?
A 10% safety margin is standard for stockinette projects. For complex cables, brioche, or colorwork with long floats, budget a 15% safety buffer to prevent running out of yarn.
What should I do if my gauge has fewer stitches than the pattern?
Fewer stitches per 4 inches means your stitches are larger and looser. Go DOWN one needle size (e.g. from US 8 to US 7) to achieve tighter tension, or use the tool's adjusted cast-on number.
What is the difference between M1 and K2tog?
M1 (Make 1) is an increase stitch that adds a new loop from the horizontal strand between stitches. K2tog (Knit 2 Together) is a right-leaning decrease that merges two stitches into one.