Yarn Quantity Calculator

It depends on the project's size, your yarn's thickness, and your gauge (how tightly you knit or crochet). The most accurate way is the gauge-swatch method: knit or crochet a small swatch, find out how much area a given length of yarn covers, then scale that up to the total area of your project. Use the "Gauge & area method" tab above for this, or the "Quick estimate" tab for a fast ballpark based on common project sizes.

Weigh your swatch, then use your yarn label's yardage-per-skein and weight-per-skein to work out how many yards that swatch weight represents. Divide by the swatch's area to get yards per square inch (or cm), then multiply by your project's total area and add a safety margin. For example, a 4×4in (16 sq in) swatch made from 17.6 yards of yarn works out to 1.1 yd per sq in — so a 60×40in project (2,400 sq in) needs about 2,640 yards raw, or roughly 2,900 yards with a 10% margin.

Use the "Quick estimate by project" tab instead. It gives a commonly cited yardage range for the project type you pick (hat, scarf, blanket, sweater, and more), based on typical worsted-weight yarn usage. It's less precise than the gauge-swatch method since it doesn't account for your specific yarn or tension, but it's a useful starting point when shopping before you've started swatching.

Yes, significantly — thicker yarn covers more area per yard, so a bulky-weight project needs far fewer yards than the same size made in fingering weight. The Gauge & area method automatically accounts for this because it's based on your actual yarn's weight and yardage, not a generic multiplier. The Quick estimate tab assumes worsted (medium) weight, so treat its numbers as reference points only if you're using a different weight.

A 10–15% margin is standard, to cover swatch measurement variance, tension changes over a long project, dropped stitches, and seaming or fringe. The Gauge & area calculator defaults to 10% and lets you adjust it — increase it for lace or cable patterns where stitch definition and blocking can use more yarn than a plain stockinette swatch suggests.

Yes. Switch "Project area" to "Multiple pieces" in the Gauge & area tab, then add a width × height for each piece from your pattern's schematic (front, back, each sleeve, and so on). The calculator sums all the piece areas before applying your yarn's density and safety margin.

No. The calculator runs entirely in your browser — nothing you enter is sent to a server. Use "Copy result summary" to save your numbers before closing the tab, since nothing persists between visits.