Yarn Substitution Calculator

Swapping yarn for a project? Find out exactly how many skeins of your new yarn to buy to match the pattern's total yardage.

📖 How it works & FAQ

Skeins the pattern calls for Yards per skein of the pattern's yarn Yards per skein of your new yarn

What this calculator does

When a knitting or crochet pattern lists the yarn by skein count, those numbers only work for the exact yarn the designer used. Skeins vary wildly in length — one put-up might hold 220 yards while another holds 330 — so grabbing the same number of skeins in a different yarn can leave you badly short or with an expensive pile of leftovers. This tool converts the pattern into the one figure that actually matters, total yardage, then tells you how many skeins of your chosen substitute yarn to buy to cover it.

The math behind it

It's simple and transparent. First it finds the total length the pattern needs: pattern skeins × yards per pattern skein. Then it divides that by the yardage of your new yarn's skein and rounds up to the next whole skein, because you can't buy a partial ball. It also shows how many yards you'll have to spare, which is handy for gauge swatches and seaming.

How to use it

Enter how many skeins the pattern calls for.
Enter the yards per skein of the pattern's original yarn (check the pattern or the yarn's ball band).
Enter the yards per skein of the new yarn you want to substitute.
Press Calculate to see your total yardage and the number of new skeins to buy.

FAQ

My yarn is labeled in meters, not yards. Does that work?: Yes — the math is identical as long as all three fields use the same unit. Just enter meters everywhere and read the result as meters.
Why does it round up?: You can only buy whole skeins, and running out mid-project often means a dye-lot mismatch. Rounding up guarantees you have enough to finish.
Should I buy an extra skein anyway?: For color-critical projects it's smart to grab one spare in the same dye lot. Substitute yarns can knit up at a slightly different gauge, which changes how much you use.
Does this account for gauge differences?: No. It matches yardage only. A very different weight or gauge can shift consumption, so always swatch. Results are estimates — verify against your pattern and ball band before purchasing.