Yarn Substitution Helper
Calculate how much substitute yarn you need when swapping yarns in a pattern. Compare weights and get gauge recommendations.
Yarn Substitution Helper
Calculate how much substitute yarn you need when swapping yarns in a pattern
Original Yarn (Pattern Calls For)
Substitute Yarn (What You Have)
Formula
Substitute Skeins = Total Yards ÷ Substitute YardageBased on matching total yardage, not weight
Yarn Weight Reference (CYC Standard)
| CYC | Name | Also Called | Gauge (st/4") | US Needle |
|---|---|---|---|---|
| 0 | Lace | Cobweb, Thread | 33-40 | 000-1 |
| 1 | Super Fine | Fingering, Sock | 27-32 | 1-3 |
| 2 | Fine | Sport, Baby | 23-26 | 3-5 |
| 3 | Light | DK, Light Worsted | 21-24 | 5-7 |
| 4 | Medium | Worsted, Aran | 16-20 | 7-9 |
| 5 | Bulky | Chunky, Craft | 12-15 | 9-11 |
| 6 | Super Bulky | Roving | 7-11 | 11-17 |
| 7 | Jumbo | Roving | 1-6 | 17+ |
Substitution Tips
Match the Yardage, Not the Weight
A 100g skein of cotton might have 180 yards, while 100g of wool could have 220 yards. Always calculate based on total yardage needed.
Consider Fiber Content
Different fibers behave differently. Cotton has no memory, wool is springy, acrylic is durable. Consider how the fiber will affect your finished project.
Always Swatch
Even with the same weight category, different yarns can produce different gauges. Always knit a gauge swatch before starting your project.
How to Use
- 1Enter original yarn — Input the yarn weight, yardage per skein, and grams per skein from your pattern.
- 2Enter skeins needed — Input how many skeins the pattern calls for.
- 3Enter substitute yarn — Input the details of the yarn you want to use instead.
- 4Check compatibility — Review the compatibility warning and gauge recommendations.
- 5Buy substitute yarn — Purchase the calculated number of substitute skeins.
Frequently Asked Questions
Why substitute by yardage instead of weight?
Different fibers have different densities. A 100g skein of cotton has less yardage than 100g of wool. Matching yardage ensures you have enough yarn.
Can I substitute different yarn weights?
You can, but it will significantly affect your gauge and finished size. Stay within one weight category for best results.
What if my substitute has more yardage?
You'll have leftover yarn. Consider making matching accessories or save it for future projects.
Should I buy extra skeins?
Yes! Buy 1-2 extra skeins to account for gauge differences and ensure dye lot consistency.