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Crochet Yarn Calculator So You Never Run Out Mid-Project

You run out three rows from the end, the shop no longer has that dye lot, and the blanket gets a stripe you never planned. Or you overbuy and the extra skeins sit in a bin.

Pick a project size, your stitch and yarn weight, and your skein length. You get the yards, meters and skeins to buy, worked out from the stitches the project takes, with 10% extra built in.

Calculate your yarnSee how it works
Illustration of five balls of yarn in cream, coral, lavender and sage beside a striped crochet swatch and a crochet hook

Estimate your yarn

Choose a project or enter your own width and height, then your stitch, yarn weight and skein length. The estimate includes 10% extra.

A yarn estimate in three steps

  1. 1

    Pick the project

    A lovey, baby blanket, throw, twin, queen or king blanket, a scarf, a beanie, or your own width and height.

  2. 2

    Pick stitch and yarn

    Single, half double, double crochet or C2C, the yarn weight, and your own gauge if you have swatched.

  3. 3

    Buy once

    Get the total in yards and meters and the number of skeins for your skein length. Buy them all from one dye lot.

Why this estimate is closer than a rule of thumb

Most yarn calculators multiply area by one “yards per square inch” figure. This one counts stitches. Your gauge says how many stitches and rows fit; each stitch uses a set length of yarn measured in stitch widths: about 7½ for single crochet, 9½ for half double and 12 for double crochet, because taller stitches wrap more. Foundation and turning chains are counted too.

For corner-to-corner it counts tiles: 3 double crochets and a chain-3 each, sized from your gauge. The same model sits behind the yarn list in every StitchThis crochet pattern. Then 10% is added for tails, joins and the odd mistake.

Design and preview free, right in your browser. Your first basic pattern is free with an account.

Calculate your yarn

Common crochet blanket sizes

Typical finished blanket sizes used by the calculator presets
BlanketInchesCentimetersGood for
Lovey12 × 1230 × 30A comfort square for a baby
Baby30 × 3676 × 91Stroller, crib or play mat
Throw50 × 60127 × 152The sofa
Twin66 × 90168 × 229Top of a twin bed
Queen90 × 100229 × 254Top of a queen bed
King108 × 100274 × 254Top of a king bed

There is no single official standard for blanket sizes. These are common sizes that cover the top of the mattress with a modest drop; measure your bed if you want it to reach the floor.

Make the estimate yours

  • Tension changes yarn use more than anything else. Crochet a 6-inch (15 cm) swatch, count stitches and rows over 4 inches (10 cm), and enter your own gauge.
  • For the closest figure, weigh the swatch, divide by its area, scale up to the blanket, and convert grams to yards from the label.
  • Buy every skein from the same dye lot, plus one spare. A spare skein becomes a beanie; a missing one becomes a stripe.
  • Yarn weights follow the Craft Yarn Council yarn weight system. Skein lengths are typical for each weight; check your label.
  • Wearables get an exact count: the crochet garment pattern maker counts the yarn stitch by stitch for every size, and the beanie calculator does hats. Everything else is on the StitchThis crochet tools page.

Frequently asked questions

How much yarn do I need for a crochet blanket?

It depends most on size, stitch and yarn weight. As a rough guide in worsted weight, in single, half double or double crochet: a 30 × 36-inch baby blanket takes about 700 to 1,000 yards and a 50 × 60-inch throw about 2,000 to 2,700 yards.

Is the 10% extra included?

Yes. Every estimate already includes 10% for tails, joins and swatching. One extra skein from the same dye lot is still a good idea.

Does single crochet use more yarn than double crochet?

For the same area, yes. Single crochet is short and dense, so you work many more stitches to cover the same space.

How accurate is the C2C estimate?

It counts the tiles your size needs and the yarn in each tile. C2C tension varies a lot between crocheters, so check it against a 10 × 10 tile swatch.

Do I need an account?

No. The yarn calculator is free with no sign-in.

Related crochet tools

  • Crochet Beanie Calculator for Hats That Fit the First TimeEnter the head size and your gauge. You get the crown diameter to aim for, the stitches around, how many increase…Open the beanie calculator →
  • A Crochet Garment Pattern Maker for Clothes That Actually FitStart from your own measurements or a standard size from XS to 5X, with your yarn and gauge. You see every piece…Open the garment pattern maker →
  • A Crochet Sweater Pattern Generator Sized to YouPick the construction you want (raglan, set-in sleeves, drop shoulder or cardigan), your size or your measurements,…Open the sweater pattern generator →

See all our crochet tools

Make your next crochet pattern yours

Design and preview free. Your first basic crochet pattern is free with a StitchThis account; after that it’s $5.99 a pattern, 5 for $20, or Craft Unlimited ($9.99/month or $99.99/year) for unlimited patterns in every craft. Every craft, unleashed.

Calculate your yarnCreate a free StitchThis accountSee plans and pricing
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