How Much Yarn Do I Need?
Yarn requirements come down to two things: how much fabric you're making, and how much yarn each square inch of that fabric consumes. Area is easy — width times length. Consumption depends mostly on yarn weight: thin fingering yarn packs many stitches into an inch and uses over three yards per square inch of stockinette, while super bulky covers the same area with barely one. This calculator multiplies your project's area by a typical yards-per-square-inch figure for your yarn weight, adjusts for craft (crochet stitches consume roughly 25–30% more yarn than knit stitches of the same coverage), and adds a 10% margin.
Ballpark numbers for common projects
For a sense of scale in worsted weight: a standard scarf (8 × 60 in) runs about 1,000 yards, a hat 150–250 yards, a baby blanket (30 × 36 in) around 2,200 yards, and an adult throw (50 × 60 in) can exceed 6,000 yards — which is why blankets are a commitment. Sweaters are shaped rather than flat, but 1,000–1,500 yards covers most adult sizes in worsted.
Why you should always buy one extra skein
Dye lots are the reason. Two skeins of the "same" color from different dye lots can differ visibly, and if you run short mid-project, your exact lot may no longer exist. Buying all your yarn at once from one lot — including the safety skein — is cheaper than the alternative: a blanket with one mysteriously different stripe. Most yarn shops accept returns of unused skeins, so the extra one costs you nothing if your estimate holds.
Frequently asked questions
- How many skeins for a scarf?
- In worsted weight at ~220 yards per skein, a standard adult scarf takes 4–5 skeins. Bulky yarn cuts that to 3.
- Does crochet really use more yarn than knitting?
- Yes — the taller, denser structure of crochet stitches uses roughly a quarter more yarn for the same finished area.
- What if my pattern is lacy or cabled?
- Lace uses noticeably less yarn than the estimate; cables and textured stitches use 10–20% more. Adjust the safety margin accordingly.