How Much Yarn Do I Need for a Baby Blanket?

Baby blanket sizing runs smaller and more forgiving than most projects, which makes it a good place to see the yardage math in action before applying it to something larger. The two numbers that drive the estimate are finished size and yarn weight, in that order.

Typical baby blanket sizes

A stroller or lovey-sized blanket runs around 30in by 30in. A crib blanket typically lands between 36in by 45in and 40in by 60in. Receiving blankets are usually smaller still, around 30in by 40in. Picking the right size category before estimating yardage matters more than it might seem, since a crib blanket can use more than double the yarn of a stroller blanket at the same weight and stitch pattern.

Worked example: 36in x 45in crib blanket, worsted weight, stockinette

Area: 36 x 45 = 1,620 square inches. Using the yardage-estimate method described in how yarn yardage estimates are calculated, worsted weight in plain stockinette lands in the range of roughly 650-770 yards before a buffer, and closer to 720-850 yards with the standard 10% safety margin. At a typical worsted skein of 200 yards, that's 4 skeins, with the 5th likely unopened.

Adjusting for stitch pattern and yarn weight

A textured stitch, like a simple garter-and-seed border or an all-over cable, pushes that number up by 20% or more. Switching to a lighter yarn weight, DK instead of worsted for the same size, increases yardage further still, since thinner yarn needs more length to cover the same area even though it uses less total fiber weight. Run your specific dimensions, weight, and stitch pattern through the yarn yardage calculator rather than relying on this example's numbers directly, since a different stitch pattern or a size in between these categories changes the total meaningfully.

Buying strategy

Because baby blankets are small enough that one extra skein is a minor cost, rounding up rather than cutting it close is usually the better trade. Running short on yarn from a discontinued dye lot partway through a border is a far more expensive problem than an unopened extra skein.