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How Much Yarn Do I Need for a Blanket?

August 6, 2026

You've decided on a blanket. Maybe there's a pattern that doesn't say how much yarn it takes — or there's no pattern at all, just you, a hook, and a stitch you love. Either way, you're standing in the yarn aisle asking the same question every crocheter has asked: how many of these do I actually need?

(The throw in the photo is ours. Remember it — it's about to prove every caveat in this post.)

Here are real numbers. But first, the part most charts skip:

These are estimates, and honest ones come as ranges. How much yarn a blanket takes depends on your tension, your stitch, your hook, and your yarn — so two people making the "same" blanket can use very different amounts. The ranges below cover a solid stitch at average tension — plain rows of single, half double, or double crochet with no decorative holes, the way most simple blankets are made. Your blanket is allowed to disagree with a chart, and the tips further down will keep that from ever becoming a problem.

Blanket sizes in medium (4) yarn

Medium weight (4) — the everyday yarn most blankets are made from — first, since it's what most of us are holding:

Skein counts depend entirely on the label: a throw at roughly 1,800–2,600 yards is 5–8 standard skeins (around 350 yards each), but only 3–4 of the big value skeins (800+ yards). *Always divide by the yardage on your label*, not by "skeins" from any chart — including this one.

Which end of the range is yours? Your stitch decides. Single crochet is the hungriest — short, dense stitches, so it takes many more of them to cover the same blanket — and it runs to the top of every range above, sometimes past it. Double crochet covers ground fastest and sits near the bottom. Half double lands in between. So if the whole blanket is single crochet, buy as though you're at the top of the range; if it's double, the bottom is a fair bet.

The same throw in other yarn weights

Thinner yarn means more yards for the same blanket (more strand, less thickness); chunky yarn means fewer yards, faster blanket. For a 50″ × 60″ throw:

Not sure which weight your yarn is? Our free yarn weight chart sorts it out from the label symbol.

Why your number will be different

This is the part that keeps these charts honest:

• Your tension. Tight crocheters pack more stitches (and more yarn) into every inch. Relaxed crocheters use less. Neither is wrong.
• Your stitch. Openwork like granny stripes can use a quarter less yarn than these ranges; dense, textured stitches — ripples, alpine, and yes, our beloved bobbles — can use a quarter more.
• Your hook. Going up or down a hook size changes the fabric and the yardage. (Hook lost its label? Hook size chart.)
• Your border. A wide border on a big blanket is easily an extra skein on its own.
• Your yarn. Two medium (4) yarns can behave like different creatures — cotton, acrylic, and wool all fill space differently.

Want proof? The sampler throw in the photo at the top — bigger than a standard throw, with nearly every panel worked in a different textured stitch, cables and bobbles everywhere — took about 4,000 yards. The table says 1,800–2,600 for a throw. That's not the chart failing; that's a bigger blanket in hungrier stitches, which is exactly the math this section describes. Plan with the table, then let your blanket tell you the truth.

The rules that save you

1. Buy 10–15% more than the estimate. Running out at row 148 of 150 is a special kind of heartbreak.
2. Buy it all from the same dye lot. Check the small number printed on the label — skeins from different lots can be slightly different shades, invisible in the store and painfully visible in row after row of your blanket. Extra skeins from the same lot are insurance; a matching color from a different lot is a gamble.
3. If a pattern lists yardage, trust the pattern over any chart — the designer measured their actual blanket.
4. Leftovers are never wasted. Unused skeins can often be returned, and opened ones become granny squares, stripes, and scrap blankets.

Want a number you can actually trust? Weigh a swatch

Five minutes and a kitchen scale beat every chart on the internet, because this method measures you — your hook, your tension, your stitch, your yarn:

1. Crochet a swatch in your blanket stitch, about 6″ × 6″.
2. Measure its real width and height, then multiply for the area (6″ × 6″ = 36 square inches).
3. Weigh it in grams.
4. Blanket grams = swatch grams × (blanket area ÷ swatch area). A 50″ × 60″ throw is 3,000 square inches — about 83× a 6″ swatch. If your swatch weighs 14 g, that's roughly 1,170 g of yarn.
5. Divide by the grams on your yarn label for the skein count — 100 g skeins would mean 12 — then add one for the rule above.

Bonus: the swatch tells you your gauge too, so the blanket comes out the size you planned — not just the yardage.

This math is exactly the kind of thing Crochet Bobble was built to do for you — the app scales rectangular patterns to any blanket size and works out the yarn factor automatically, straight from the pattern you're using.