48I need to do some yarn math

Swap between units, work out how much substitute yarn you need, and look up abbreviations

Before you start
1
Find them
Calculators section in Tools with gauge toolkit, units converter, yarn substitution, glossary, and yarn pooling

Go to Tools → Calculators. All the yarn math sits in one place: the Gauge Toolkit, Units Converter, Yarn Substitution, Stitch Abbreviation Glossary, and Yarn Pooling calculator.

Gauge has its own guide: Calculate Your Gauge. Pooling is covered in Plan Your Color Palette.
2
Meters or yards, grams or ounces
Units Converter switching between meters and yards, centimeters and inches, grams and ounces

The Units Converter swaps between meters and yards, centimeters and inches, and grams and ounces. Those are the three every pattern asks for sooner or later. Type a number on either side and the other side changes as you type.

Same yarn, different label. European patterns give the length in meters, American ones in yards. A 100 g skein of "400 m" and one of "437 yds" hold the same amount of yarn.
3
How many skeins of the other yarn?
Yarn Substitution calculator computing how many skeins of substitute yarn are needed

Yarn Substitution answers the old question. The pattern wants 8 skeins of yarn X, so how many skeins of yarn Y do you need? Type in the original yarn's skein count and length per skein, then your substitute's length per skein. It works from the total length of yarn rather than the weight, divides that by the length of one substitute skein, and rounds up.

Length is the honest measure. Two 50 g skeins can hold very different lengths, depending on the fiber and the spin. Compare lengths, then check the gauge matches too.
Looking for which yarn to substitute? See Search and Compare Yarns.
4
What does k2tog mean?
Stitch Abbreviation Glossary listing knitting and crochet abbreviations with explanations

The Stitch Abbreviation Glossary is a pattern dictionary. Look up k2tog, ssk, yo, sc or hdc, with knitting and crochet terms both covered. Search for the abbreviation, or read the whole list when a pattern throws something new at you.

Reading a pattern in the Smart Reader? The glossary stays one tap away in Tools. You can also pin the pattern's own abbreviation section into the sidebar as a Pattern Snapshot.
See snapshots in Notes & Design Choices.

Available on iPhone, iPad, Android, and web at app.stash2go.com

Projects · 9 of 10 · Last updated 29 Aug 2026