Crochet Yarn Calculator

How to estimate yarn for a crochet project

1. Pick the stitch. Single, half double and double crochet, tapestry with carried colors, C2C blocks or filet mesh. Each uses a different amount of yarn per square inch.
2. Pick the yarn weight. The Craft Yarn Council number on the label, #0 lace to #7 jumbo. The gauge and skein fields fill in typical values for that weight.
3. Enter your gauge. Stitches and rows over 4 in (or 10 cm) of your swatch. This matters more than anything else; the prefilled gauge is only a starting point, and the gauge section below shows how it turns into stitches and size.
4. Choose a size. Pick lovey, baby, throw, twin, full, queen or king, or type width and height in inches or centimeters.
5. Check your skein. Type the yards and grams from your yarn label if they differ from the default put-up.
6. Read the estimate. Yards, meters and grams are the estimate itself; skeins are rounded up with 10% extra included.

How much yarn each stitch uses

Same yarn, same size, different stitch: the yardage changes by almost half. These figures are this calculator's estimates for a 50 × 60 in throw in #4 worsted at the default gauge for each stitch (cells × rows per 4 in). Tapestry carries one extra color; filet is half filled.

Both yarn columns count all the yarn that goes into the fabric, and yards per sq in is the inches per stitch ÷ 36 ÷ the area of one stitch at that gauge. Tapestry: 2.37 in for the sc itself plus 0.28 in of the carried strand running inside it = 2.65 in per stitch. Filet shows inches per filled / open square, and yards per sq in for a half-filled mesh; C2C shows inches per block. Estimates — buy about 10% extra.

Single crochet is the densest common stitch, so it uses the most yarn per area. Double crochet is taller and more open. C2C sits between them: each block is 3 dc plus a chain-3, and the joins add a little. Filet saves thread in every open square. Tapestry costs more than plain single crochet because the carried strands travel inside the stitches across the whole row; that is why a tapestry wall hanging can take as much yarn as a much larger dc blanket.

Yarn weights, gauges and a throw in each

Thinner yarn means more, smaller stitches for the same size, so it takes more yards but often fewer grams. The CYC column is the Craft Yarn Council's single crochet range over 4 in; the calculator starts from a firm gauge at or just above the top of that range, which is typical for picture crochet where crisp edges matter.

CYC ranges: Craft Yarn Council Standard Yarn Weight System. Skein put-ups are typical examples; enter yours.

Crochet gauge calculator: from a swatch to stitches and size

Gauge is the link between a chart and a finished size, so the calculator doubles as a crochet gauge calculator. Crochet a swatch at least 5 in (12 cm) wide in the stitch you will use, block it the way you will block the piece, and count the stitches and rows inside the middle 4 in or 10 cm. Type those two numbers into the "Stitches" and "Rows" gauge fields above (they read per 4 in, or per 10 cm when you switch to centimeters). Then:

• Size to stitches: stitches across = width × stitches ÷ 4 (in) or ÷ 10 (cm); rows = height × rows ÷ 4. A 50 in throw at 16 sc per 4 in is 50 × 16 ÷ 4 = 200 stitches.
• Stitches to size: width = stitches ÷ gauge × 4. A 60-stitch chart at 16 per 4 in is 15 in wide; at 14 per 4 in it is 17.1 in.
• Yarn follows gauge: the same 50 × 60 in throw changes stitch count and yardage with your tension, as the table shows.

Single crochet in #4 worsted, from this calculator's model. Estimates — buy about 10% extra.

Tighter gauge means more, smaller stitches: more rows to work, but each stitch uses less yarn, so the total moves less than the stitch count does. The chart makers use the same gauge fields, so the finished size you see under a chart matches the numbers here.

Worked example: a single crochet throw

A 50 × 60 in throw in worsted at 16 sc × 18 rows per 4 in is 50 × 16 ÷ 4 = 200 stitches across and 60 × 18 ÷ 4 = 270 rows, or 54,000 stitches. At that gauge one stitch is 0.25 in wide and 0.22 in tall and uses about 2.165 in of yarn, so the throw needs 54,000 × 2.165 ÷ 36 ≈ 3,248 yards (2,970 m, about 1,767 g). With 10% extra that is 3,573 yards, or 10 skeins of 364 yards. This is the crochet blanket yarn calculator math for every size and stitch above.

Where the numbers come from

The yarn calculator for crochet rests on one idea: yarn per stitch grows with the stitch's size. It starts from reference rates in worsted, each measured at its own reference gauge — 0.80 yd per square inch for double crochet, matching published blanket estimates of about 870 yards for a 30 × 36 in crib blanket and 2,415 yards for a 50 × 60 in throw; 1.10 for single crochet at 16 × 18 per 10 cm (about 2⅛ in of yarn per stitch); 0.95 for half double; and 0.98 for C2C, from a measured worsted square that took 250 yards for 16 × 16 in with 5 blocks to 4.25 in. Your gauge then scales the length of each stitch, and the rate per square inch moves with it: bigger stitches use more yarn each but cover more area, so the same 16 × 18 counted per 4 in (slightly bigger stitches than per 10 cm) comes to 1.08 yd per square inch, the figure in the stitch table above. Tapestry adds the carried strands across each row; filet counts 3 dc per filled square and 1 dc plus 2 chains per open square. These are estimates — colors, tension and yarn construction vary — so every result says to buy about 10% extra.