Sweater Yarn Yardage Calculator

The single most common cause of a half-finished sweater is running out of yarn part way through. Yardage requirements rise faster than you expect with size, and worsted-weight estimates from a pattern do not transfer to fingering-weight substitutions without recalculation.

The numbers here are averaged across published per-size yardage from mainstream sweater patterns. The base estimate is for a long-sleeved crew-neck pullover. Cardigans add about 10% for the front bands and button overlap, short sleeves drop about 20%, and texture is handled separately: cables pull the fabric in so you knit more stitches per inch of width, and stranded colorwork carries a second yarn behind every patterned stitch.

Base yardage, long-sleeve crew, plain stockinette

Within each size, fingering uses the most yardage because each stitch covers less surface, then sport, DK, worsted, bulky in descending order.

Always buy 10-20% extra. Dye lots vary subtly between batches, and ordering more later from a different lot may produce a visible color shift even with the same listed shade. Many knitters buy a “safety skein” for every project; if it stays untouched it gets used in scrap-yarn projects later.

Worked example: medium pullover (40 in chest), worsted weight, long-sleeve crew, plain stockinette. Read 1300 yards off the table. Add the 15% safety margin and you need 1495 yards. At 200 yards per skein that is 8 skeins, with about 105 yards spare.

Tips for when it looks like running short:

Knit the sleeves first. You then know exactly how much is left for the body, and sleeve length is the easiest thing in a sweater to shorten by an inch without anyone noticing.

If you do end up holding two dye lots, do not simply switch when the first runs out. Alternate two rows from each skein across a few inches and the join becomes invisible; a hard switch shows up as a line across the chest under any decent light. Failing that, put the odd lot into the cuffs and hem, where a deliberate contrast reads as a design choice rather than a mistake.

Pattern designers usually publish yardage requirements per size, and those beat any generic estimate. This calculator is a sanity check for substitutions and stash-busting projects without a specific pattern.