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Yarn Calculator for Blanket, Scarf, or Hat

A yarn calculator for a blanket multiplies finished area by a typical grams-per-square-inch for the yarn weight, then converts to yards using the ball-band yardage. The figure is an estimate for stockinette or single crochet, not a promise from a specific skein dye lot.

Quick Summary & Direct Answer
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How much yarn does a blanket need?

A 50×60 in throw in worsted yarn is about 450 g, or 900 yards at 200 yards per 100 g, plus a 10% buffer. Lighter yarn uses more yards for the same area; bulky yarn uses fewer yards and more grams.

Key Takeaways

  • Area in square inches times a density factor gives grams.
  • Yards come from the ball band, not from a universal constant.
  • Add 10% extra for swatches, tails, and a mismatched dye lot.
  • Openwork or brioche can miss this estimate by a wide margin.

Yarn needed

990 yd

Grams495 g
Ounces17.5 oz
100 g skeins4.95
Metres905 m

Example: 50×60 in = 3,000 in². Worsted at 0.15 g/in² is 450 g before extra. At 200 yd/100 g that is 900 yards; 10% extra is 990 yards, or 5.0 skeins of 100 g.

Results can be wrong. This calculator is unofficial. Figures can be incomplete, rounded, or not updated. Use them at your own risk and check a tape, datasheet, ball band, or official chart before cutting, mixing, buying, or publishing. Grams per square inch are typical stockinette or single-crochet densities, not a ball-band guarantee. Weigh a swatch when the stitch is lace, cables, or a thick fabric. Limits of liability are in the terms of service.

Frequently asked questions

It treats the blanket as a rectangle, multiplies area by a typical grams-per-square-inch for that yarn weight, then converts grams to yards with the ball-band figure.

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Publisher notes · reviewed 29 October 2026

Yardage is area times a density, then the ball band

Grams equal width × length × a typical grams-per-square-inch for the yarn weight. Yards equal grams / 100 × the printed yards per 100 g. Textured stitches miss the table; weigh a swatch instead.

Why 10% extra

Dye lots end. Swatches eat yarn. The extra percent is a buffer, not a physics term.

Worked examples

  • 50×60 in worsted throw

    3,000 in² × 0.15 g/in² = 450 g. At 200 yd/100 g that is 900 yards, 990 with 10% extra.

Limits of this page

  • Openwork, brioche, and tapestry crochet can need far more yarn.
  • Skein put-up other than 100 g must be divided by the user.

Sources