Interactive tools
Project math with the rounding visible
Each calculator runs in your browser and keeps assumptions separate from the result.
01
Yarn calculator from a swatch
Estimate project mass, length, and whole skeins.
Open tool → 02Gauge conversion planner
Compare raw counts and simple repeat candidates.
Open tool → 03Pattern repeat calculator
Keep multiples, balance, and chains separate.
Open tool → 04Batch 02Yarn substitution calculator
Calculate substitute packages and inspect label and gauge differences.
Open tool →Supporting topic
Yarn substitution workflow
Use the calculator with the topic guide to separate purchasing math from fabric verification.
What these tools do not do
They do not guarantee yarn quantity, fit, drape, or a safe rewrite of a shaped pattern.