Frequently asked questions

Is this really free?

Yes, fully free. No account, no paywall. The site runs on a static host and costs us very little to operate. At some point ads (modest, non-tracking) will probably appear in the layout. We'll never charge for the converter, cheat sheets, or calculators.

Where do your values come from?

Each cheat sheet and calculator lists its sources at the bottom of the page. Common ones include the NEC (NFPA 70) for electrical, ASTM for materials and dimensions, ISO for international standards, IEC for electrical international, and NIST/BIPM for physical constants and unit definitions. If you spot a value that disagrees with the cited source, let us know — we'll fix it.

Can I print or share a cheat sheet?

Yes. Every cheat sheet has a Print button that strips away the navigation and produces a clean, printable layout — landscape letter-size by default. You can also "Save as PDF" from the same dialog. Every cheat sheet can also be copied as a Markdown table for pasting into wikis, GitHub, or documentation.

Why don't you have [my specific cheat sheet]?

We're early. The site launched with the most-requested cheat sheets and we're adding more on an ongoing basis. If there's one you want and don't see, tell us — that's how we prioritize.

Is the data accurate enough for professional use?

The data is sourced from the same primary standards a professional would consult directly. That said: for any installation, code-compliance review, or safety-critical decision, you should verify against the original standard (NEC, ASTM, etc.) and consult a licensed professional. The site is a starting point and a quick reference, not a replacement for engineering judgment.

Why don't you use AI for the explanations?

Because the credibility of a reference site is built on values you can trust. AI systems are great at language, but in engineering reference they hallucinate frequently — wrong AWG numbers, made-up torque specs, plausible-but-incorrect derating factors. Every page on this site is hand-written and reviewed against named primary sources. That's what makes it different.

Do you track me?

We use aggregate page-view analytics (visit counts, anonymized country/device data). No individual tracking, no third-party advertising cookies, no cross-site profiling. Conversions run entirely in your browser — your input values never reach our server.

Can I embed a cheat sheet on my site?

Not yet — that's on the roadmap. The plan is an <iframe> embed similar to what we offer on regexguide.com, so you can drop a cheat sheet into your blog, wiki, or documentation. If this would be useful to you, let us know.

How do I report an error?

Use the contact page. Include the cheat-sheet name, the specific value you think is wrong, and ideally the source you'd cite for the correct value. We respond.