How sweater yarn estimates are built
We approximate the sweater as a body rectangle (chest × length) plus two sleeves, convert that surface to an equivalent area, then apply the density model with a 15% waste factor for seaming, ribbing, and swatches.
Formula
Body area = chest × length; sleeve area ≈ 2 × (chest/4 + 2") × sleeve length; total yards = area × density × 1.15. Size chart values are common adult finished measurements in inches.
Worked example
Size M (40" chest, 26" length, 18" sleeve), worsted knit, 200 yd skeins: expect on the order of 1,000+ yards and several skeins. Crochet or Aran cables push the count higher.
Tips
Compare against your pattern’s yardage first. For cropped or tunic lengths, start from the closest size and scale by length ratio.
Common mistakes
Using fingering yardage charts with bulky yarn; forgetting sleeves; omitting ease; not swatching after substitution.
Size chart notes and ease
Built-in sizes use common adult finished chest measurements from XS through 2XL. They are not body measurements; add or subtract ease in your pattern separately. Short sleeves reduce yardage roughly in proportion to sleeve length; cropped bodies scale with length. Colorwork and cables can add 10–25% yarn. When substituting fiber, remember that cotton sweaters often need more ease and may need extra yardage because cotton has less stretch recovery than wool. Keep dye-lot stickers until the sweater is finished and blocked.
Limits and how to use the results
Estimates run only in your browser. Prefer a published pattern’s tested yardage when it conflicts with this planner. Density factors and assumptions are documented on the methodology page; legal terms cover planning-use limits.
FAQ
How many skeins for a sweater?
Worsted adult sweaters often need 5–10 skeins of 200 yd / 100 g, depending on size and stitch pattern.
What if my yarn is DK?
Choose category 3. DK usually needs more yards than worsted for the same size.