Knitting & Crochet Calculators
Instant, free calculators for the math every knitter and crocheter runs into — gauge, yarn yardage, stitch counts, and cast-ons. Everything runs in your browser: no signup, no waiting.
Measurement
- Gauge CalculatorKnit or crochet a swatch, count your stitches and rows over a measured area, and this calculator converts that into stitches and rows per inch, per 4 inches, and per 10cm so you can compare it directly to a pattern's stated gauge.
- Stitch Multiple CalculatorEnter your gauge, target width, and the pattern's stated stitch multiple (like "multiple of 4 + 2") to get the exact cast-on count and the nearest valid counts above and below it.
Cast-On & Sizing
Shaping
Conversion & Reference
- Needle & Hook Size ConverterEnter a US, UK/Canadian, or metric (mm) knitting needle or crochet hook size and get the equivalent sizes in the other two systems.
- WPI (Wraps Per Inch) to Yarn Weight ConverterWrap your mystery yarn around a ruler for exactly one inch, count the wraps, and enter that number here to get its yarn weight category and a suggested needle or hook size range.
Yarn Quantity
- Yarn Stash / Remaining Yarn CalculatorWeigh your partial skein, enter the full skein's weight and yardage from the label, and this calculator estimates how much yardage is actually left.
- Yarn Yardage CalculatorEnter your project's width and height, yarn weight, and stitch type, and this calculator estimates total yardage needed (plus a safety buffer) and how many skeins to buy.