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Maintainer: Hammad Iqbal

Questions about the calculators, corrections to formulas or Craft Yarn Council citations, or partnership inquiries are welcome. Please include the tool URL and the inputs you used if you are reporting a calculation issue. We welcome source corrections with links to authoritative references such as CYC standards pages.

Do not send personal projects or photos that must remain private—we do not need files to debug math questions. All calculator arithmetic already runs in your browser.

What to include in a correction

Response expectations

This is a one-person project. I aim to reply to formula and citation reports, and I log material fixes on the methodology correction log. Feature ideas are welcome; there is no guaranteed roadmap. For privacy questions, see the privacy policy; for planning-use limits, see the terms of use. Learn who maintains the site on About.

Partnerships and ads

For AdSense, sponsorship, or sister-site directory questions, email with a clear subject line. We do not accept guest posts that are unrelated to knitting, crochet, sewing, or quilting planning math. Link suggestions should point at primary standards (for example Craft Yarn Council charts) or clearly useful maker resources—not thin doorway pages.

Where to look before writing

Many “how does this number work?” questions are already answered on the tool page Formula section, Methodology, or a paired guide from the guides index. Checking those first helps you send a sharper correction if something still looks wrong.

Send a message

Up to 2,000 characters.

Or email directly: hammadiqbal117@gmail.com