Interactive crochet tool
Crochet Yarn Calculator From a Swatch
Estimate project mass, yarn length, and whole skeins from a representative swatch and product-specific label values.
Approved baseline
Swatch-based yarn estimator
Runs only in your browser.
Whole skeins—
Base yarn—
With buffer—
Read the reviewed guide
The guide explains the inputs, derivation, evidence, and limits without treating the result as a guarantee.
Open guide