Complete reference charts for yarn weights, needle sizes, and combining different yarn strands — the essential guides every knitter and crocheter needs.
Conversion chart for US, UK, and Metric (mm) needle sizes — find the right needle every time.
Complete reference for yarn weights from lace to super-bulky: needle sizes, WPI, and international standards.
Calculate the equivalent weight and gauge when holding two or more yarn strands together.
Understanding yarn weights is the foundation of every successful knitting or crochet project. Whether you're working with delicate lace-weight on fine metal needles or casting on a chunky blanket with jumbo wooden needles, our yarn weight chart translates wraps per inch (WPI), recommended needle sizes, and international weight standards into a single, easy-to-scan reference. From fingering and DK to worsted weight and beyond, you'll always know exactly which needle to reach for.
Our needle size chart covers every standard US, UK, and metric (mm) size, eliminating the guesswork when a pattern specifies an unfamiliar system. Meanwhile, the yarn held together calculator helps you figure out what gauge and weight you'll achieve when you double-strand or combine different yarns — a technique beloved for creating unique textures, adding warmth, or using up smaller skeins creatively. Browse all three charts to build a solid reference library you'll return to with every new gauge swatch.