About CraftCalc

CraftCalc exists because making is full of quiet arithmetic — gauge to dimensions, dimensions to yarn, one size to another — and most of it is taught by folklore. I'm a maker who kept re-deriving the same formulas on scraps of paper, so I built the site I wanted: calculators that show their work, and reference charts that name their sources.

What you'll find here: two free calculators (a yarn estimator and a pattern resize calculator), printable cheat sheets for needle and hook sizes and standard body measurements, and guides on the math behind all of it. Every tool runs entirely in your browser. Nothing is uploaded, stored, or account-walled.

The publishing standard is simple: exact math labeled as exact, approximations labeled as approximations, and every factual table traced to a published source — the Craft Yarn Council's standards, manufacturer and pattern-company charts, or named patternmaking references — with a "last verified" date on every factual page. Where the honest answer is "it depends", the page says that instead of inventing a confident number.

Corrections are welcome and read: Vantoron@gmail.com.