The three things that determine how much yarn you need
Every blanket yardage question comes down to three variables: the size of the blanket, the stitch you are using, and the weight of the yarn. Change any one of these and the amount of yarn you need changes noticeably.
Understanding why each variable matters helps you estimate for any blanket, not just the ones covered here. A dense stitch like single crochet uses more yarn than a taller stitch like double crochet for the same square footage. A heavier yarn covers the same area with fewer yards than a fine yarn. And a larger blanket needs proportionally more of everything.
The estimates in this guide use a standard double crochet stitch as the baseline. If you are using a different stitch, see the stitch adjustment section later in this post.
Standard yardage estimates by blanket size
These figures are for worsted-weight yarn, which is the most common choice for blankets and gives a good middle-ground reference point.
| Blanket Size | Finished Dimensions | Approx. Yards (Worsted) | |---|---|---| | Baby blanket | 30 x 35 in | 400-600 | | Lap throw | 48 x 60 in | 1,000-1,400 | | Full / queen | 60 x 80 in | 1,800-2,500 | | King | 90 x 108 in | 2,800-3,500 |
These are ranges because gauge, tension, and stitch all vary from maker to maker. If you crochet loosely, your blanket uses less yarn per square inch and you will land at the lower end. If you crochet tightly, you will be closer to the upper end.
Convert yards to skeins by dividing by the yardage listed on your yarn label. A 200-yard skein of worsted-weight yarn is a common size, which means a lap throw needs roughly 5 to 7 skeins at that skein size.
Yardage by yarn weight
If you are working with a yarn weight other than worsted, use this table as your starting point for a lap throw at approximately 48 x 60 inches:
| Yarn Weight | Approximate Yards for a Lap Throw | |---|---| | Lace | 3,500-5,000 | | Fingering / sock | 2,500-3,500 | | Sport | 1,800-2,500 | | DK | 1,400-1,800 | | Worsted | 1,000-1,400 | | Bulky | 600-900 | | Super bulky | 400-600 | | Jumbo | 250-400 |
Lace and fingering weights take far more yards because the thread is so fine. Jumbo yarn, on the other hand, can cover a lap in just a few hundred yards -- which is why arm-knitted or giant-hook blankets are so appealing as quick projects.
How to calculate your own yarn requirement from a swatch
The most accurate method for any blanket is to make your own swatch and do a simple calculation. This takes about 30 minutes but eliminates guessing entirely.
Step 1: Crochet a swatch. Make a 6-inch square in your chosen stitch and yarn. Use the hook size you plan to use for the finished blanket.
Step 2: Weigh the swatch. Use a kitchen scale accurate to 1 gram. Note the weight.
Step 3: Calculate coverage per gram. Divide the swatch area in square inches (36 square inches for a 6-inch square) by the swatch weight in grams. This gives you square inches per gram.
Step 4: Calculate total blanket area. Multiply your blanket width by its length in inches. A 48 x 60 inch throw is 2,880 square inches.
Step 5: Find total grams needed. Divide your blanket area by your square inches per gram figure.
Step 6: Convert grams to yards. Check your yarn label for grams per skein and yards per skein. Divide total grams needed by grams per skein to find the number of skeins, or use the label ratio to convert directly to yards.
This method accounts for your specific tension, your stitch, and your yarn all at once. It is more reliable than any table or estimate.
How the stitch affects yardage
The stitch you choose has a larger effect on yardage than most makers expect.
Single crochet is the reference point. It is a dense, short stitch that uses a lot of yarn relative to the fabric area it covers.
Double crochet uses roughly 10 to 15 percent less yarn than single crochet for the same blanket size. The taller stitch height means each yard of yarn covers more vertical space.
Shell stitch uses approximately 25 to 30 percent more yarn than single crochet. The curved shells require extra yarn to form their shape, and the stitch is worked more densely at the bottom of each shell.
Bobble stitch and popcorn stitch can use 40 to 50 percent more yarn than single crochet. These three-dimensional raised stitches consume extra yarn to build up the textured surface.
C2C (corner-to-corner) is close to double crochet in yardage -- the blocks are made of three double crochets each, so they use a similar amount.
If you are using a textured stitch, add the relevant percentage to your base estimate before buying yarn.
The dye lot warning
Yarn is dyed in batches. Each batch is assigned a dye lot number, which is printed on the label alongside the colorway name. Yarn from different dye lots in the same colorway can look slightly different -- sometimes visibly so when placed side by side in a blanket.
Before you buy, check that every skein you pick up has the same dye lot number. Most stores keep skeins from the same lot together, but it is worth checking each one individually. If you are shopping online, buy all your skeins in a single order from the same retailer so they are likely to come from the same lot.
Add a safety margin
Whatever total you calculate, add 10 to 15 percent before you go to the store. Gauge can shift slightly as you settle into a long project. Borders and edging use more yarn than you expect. Mistakes require frogging and re-crocheting. And if you decide to make the blanket slightly larger than planned -- which happens often -- you need the extra yarn already in hand.
An unused skein in the same dye lot can always be returned to most retailers or saved for a future project. Running out mid-blanket and being unable to match the lot is a much more frustrating problem to solve.
For a full breakdown of blanket types and which stitch suits each one, the crochet blanket patterns guide is a good next read. If you want to swap to a different yarn than the pattern calls for, the yarn substitution guide explains how to find an equivalent match by weight and gauge. You can also use the gauge calculator tool to check your stitch count and row count for any blanket size.