Trying to figure out your yarn weight from mystery skeins or unmarked cones? This handy yarn weight calculator helps you estimate your yarn’s category using just yardage, weight, or WPI (wraps per inch). Instantly get suggestions for crochet hook size, knitting needles, macramé cord equivalents, and tension or feel tips — whether your yarn is a light worsted or leaning super bulky. Perfect for crocheters, knitters, and fiber artists who love accuracy and stash diving!
Enter yarn length, weight, or WPI — we’ll estimate yarn weight, hook & needle sizes, macramé equivalent, light/heavy tips, and tension guidance. Toggle US/UK sizes below.