A craft tool with a paper trail.
Crochet Calc is independently built and maintained. This page explains who runs it, how the numbers are sourced, and what to expect from us — and what not to.
What this site is
Crochet Calc is a small, focused reference site. We publish two things: free in-browser calculators for project-planning maths (yarn yardage, gauge, hook conversions, stitch counts, blanket sizing, pricing, project time, and more) and long-form articles that explain the formulas, terminology, and techniques behind each calculator.
Every calculator runs locally in your browser. No data leaves your device, no account is needed, and no measurements are stored on a server. The articles are written to be reference-grade — the kind of explanation we wish we'd had when we started crocheting.
If you want to know how much yarn a blanket takes, what hook to use, or what to charge for an Etsy listing — that's what this site is for.
Who runs it
Kelley Delano
How calculators are built
Each calculator follows the same internal workflow before publishing:
- Formula derived from a primary source — typically the Craft Yarn Council Standard Yarn Weight System, the Crochet Guild of America guidelines, or a textbook reference (Clara Parkes, The Knitter's Book of Yarn; Edie Eckman, Around the Corner Crochet Borders).
- Formula documented in the article that pairs with each calculator. The equation is shown in plain text so you can verify it independently.
- Test cases built from real projects — a swatch, a blanket, a sweater. Calculator output is compared to actual yardage used.
- Reviewed by a second crocheter before publication.
- Re-tested annually or whenever a standard changes.
How articles are written and reviewed
Articles are drafted by the editor named above, cross-checked against primary sources, and reviewed before publication. We use a "show your work" standard: every numeric claim cites a source, every technique recommendation explains why (not just how), and disputed practices are flagged as opinion rather than fact. Read the full editorial policy for specifics on sourcing, corrections, and disclosure.
How the site is funded
Crochet Calc is supported by two revenue sources, both disclosed:
- Affiliate links on specific yarn and tool recommendations. If you click through and buy, a small commission supports the site at no cost to you. We only link to products we use or have tested. Affiliate relationships are noted at the top of articles where they appear.
- Display advertising on some article pages (not on calculator pages). Ads are served by Google AdSense and do not influence editorial coverage.
We do not sell sponsored articles, accept payment for product placement in calculators, or run brand-funded content disguised as editorial.
Privacy, in one paragraph
Calculator inputs never leave your browser. We use Google Analytics to understand which pages get traffic — that data is anonymous and aggregated. We do not sell, share, or otherwise transfer personal information. The full privacy policy has the legal version.
Corrections and feedback
If you spot a numerical error, a broken formula, or an out-of-date reference, write to us via the contact page. Corrections are made promptly and noted on the affected page with a dated edit note.
What this site is not
- It is not a pattern store. We don't sell patterns. We sometimes link to designers we like.
- It is not a yarn retailer. We don't ship yarn. We sometimes link to retailers we trust (affiliated).
- It is not a medical or legal authority. The pricing calculator is a planning tool, not financial advice. The blocking guide is informational, not occupational-therapy advice for hand pain.
- It is not affiliated with the Craft Yarn Council, Crochet Guild of America, Ravelry, Etsy, or any yarn brand. We cite them; they don't endorse us.
Questions? Get in touch.
How we research and build calculators
Every calculator on this site began with a real question we couldn't answer from a single source. "How much yarn do I need?" returns dozens of different answers across the web — some helpful, most not. Our job is to derive the actual formula from first principles, verify it against worked examples and gauge-swatch reality, and present it in a tool that anyone can use without signup, payment, or downloads.
Our calculator development workflow has six stages: (1) identify the underlying mathematical relationship from yarn-weight and gauge fundamentals; (2) derive the formula step by step, documenting any assumptions; (3) test the formula against multiple worked examples spanning project sizes from dishcloth to king blanket; (4) verify the result against industry references (Craft Yarn Council standards, established yarn brand documentation); (5) build the calculator with input validation, sensible defaults, and clear output formatting; (6) publish with the formula visible alongside the calculator so users can verify the maths themselves.
We never use placeholder calculators that produce arbitrary-looking numbers. Every calculation is reproducible by hand. Every formula is documented in the accompanying article. Every example is verified against finished projects we or others have actually made.
Editorial independence
Our editorial decisions are entirely independent of any commercial relationships. We do not accept paid placements in our calculators or articles. We do not modify recommendations in exchange for affiliate commissions. When we recommend a specific yarn brand, hook brand, or product, it is because of our team's direct experience or established industry consensus — never because of payment.
If we do use affiliate links in the future, they will be clearly disclosed at the point of use and will not affect which products we recommend or how we describe them. Our disclaimer covers our advertising and affiliate practices in detail.
Corrections and updates
We update articles and calculators when new information warrants it. Major changes — formula updates, recommendation reversals, correction of factual errors — are noted in the article's modification date and, when significant, called out in a banner at the top of the affected page. We do not silently rewrite history; corrections are visible and dated.
If you find an error, please let us know. We respond to every correction request and update the affected page as soon as possible after verification.