Blanket Size Calculator

No. Cast-On Stitches is calculated only from Blanket Width and Stitch Gauge — it's the number of stitches across the starting row, which is a function of horizontal dimension alone. Blanket Length instead determines Total Rows, through Row Gauge. The two calculations are independent, which is exactly how gauge swatches work in practice: stitch gauge and row gauge are measured and applied separately, not combined into one figure.

Because Yarn Needed (before buffer) is calculated purely from Total Stitches divided by Stitches per Yard of Yarn — a theoretical figure that assumes perfect, waste-free knitting or crocheting. In practice you'll use extra yarn for a gauge swatch, seaming multiple panels together if the blanket is worked in pieces, weaving in ends, and general tension variation across a large project. The 10% buffer is a standard safety margin so you don't run short one skein before binding off.

Yarn Needed is Total Stitches divided by Stitches per Yard of Yarn, so a higher value here — meaning each yard of yarn produces more stitches, typical of a thinner yarn or a looser stitch pattern — lowers the yardage estimate, while a lower value (bulkier yarn, denser stitch pattern like cables or seed stitch) raises it. This figure is the single input the calculator cannot verify for you: check your yarn label's yardage-per-skein and your own gauge swatch to estimate stitches per yard accurately, since it varies meaningfully between yarn weights and stitch patterns.

No — it roughly quadruples. Cast-On Stitches doubles (it scales with width alone) and Total Rows doubles (it scales with length alone), and Total Stitches is their product, so doubling both dimensions multiplies Total Stitches — and therefore Yarn Needed — by roughly four, not two. This is the same area-scaling effect you'd expect from doubling both sides of a rectangle: the perimeter doubles, but the area quadruples.