Blanket Yarn Calculator for Stitches and Skeins

Multiply the finished area in square inches by a yards-per-100-square-inches figure, then divide by 100. A 3000 square inch throw at 110 yards per 100 square inches works out to 3300 yards. Divide by your skein's yardage to get the count, which the tool rounds up so you never come up short mid-row.

Cast-on is your stitch gauge times the finished width, rounded to the nearest whole stitch. Total rows is your row gauge times the finished length, also rounded. At 4 stitches per inch across 50 inches you cast on 200, and at 5 rows per inch over 60 inches you work 300 rows.

It is how much yarn a 10 by 10 inch patch of your exact fabric consumes. Dense garter, cables and textured stitches eat more; open lace and loose gauges use less. The default 110 suits a plain worsted garter blanket, so weigh a swatch and adjust the field if your fabric differs.

Knit or crochet a swatch of known size, unravel it or use the ball band math to find the yards it consumed, then scale to 100 square inches. For example, if a 4 by 4 inch (16 square inch) swatch used 18 yards, that is 18 divided by 16 times 100, or about 113 yards per 100 square inches.

Treat it as a planning figure, not a guarantee. Stitch pattern, gauge drift, borders, edging and weaving in ends all shift the real total. Swatch first, then buy at least one spare skein from the same dye lot so a late shortage does not leave you hunting a discontinued color.

Yes. The math is craft-neutral: it multiplies width and length by whatever stitch and row gauge you enter. Crochet fabric usually swallows more yarn per square inch than knitting, so measure a crochet swatch and raise the yards-per-100 figure accordingly rather than trusting the knit default.

No. It sizes the main rectangle only. A wide garter border, a crochet shell edging or a fringe adds both stitches and yardage that this simple area model does not capture, so pad your total if your pattern has a substantial trim.

The tool rounds cast-on and rows to whole numbers, since you cannot work half a stitch. It keeps the area and yardage at full precision internally, so the yarn estimate stays accurate even when the stitch count is rounded.

Yes. Every calculation happens locally in your browser. Your measurements, gauge and yarn details are never uploaded, stored or shared, so you can plan freely offline once the page has loaded.