When to use it
- You quoted a Calculator Matters formula, worked example, or figure in an article, guide, or resource page.
- You built your own spreadsheet or tool using a formula documented on this site and want to credit the source.
- You teach or write about a topic — mortgages, break-even analysis, take-home pay — and reference our methodology as a worked example.
When not to use it
- Using the badge without actually citing or using anything from Calculator Matters — it should only appear where it is true.
- Wanting the interactive calculator itself on your page — that is a different feature, the free embed at /embed-calculators/.
- Implying a partnership, sponsorship, or endorsement — the badge means "I used their formula," not "they endorse my site."
What “verified” means here
Every formula behind this badge is documented on its calculator page — the method, the assumptions, and a worked example — and checked by an automated test suite before it ships. How that works, including a real count of formula test cases, is explained in full on our Methodology page. The badge is a shorthand for that standard, not a separate certification process.
Badge FAQ
Is this the same as embedding a calculator?
No. Embedding (at /embed-calculators/) puts a working, interactive calculator on your page. This badge is a small static image and link for when you have already cited a formula, figure, or worked example in your own writing and want to credit and link to the source.
Does the badge link count as a real backlink?
Yes — it is a normal, followed link to the specific calculator or methodology page you pick, not a tracking pixel or a nofollow widget link. Use it only where the citation is genuine; it is meant to reflect an actual reference, not to be added site-wide regardless of content.
Can I change the badge's size or colors to match my site?
The SVG is a static file, so colors are fixed, but you control size — most sites scale the width/height attributes down (or up) without distorting it, since it is vector. Pick whichever of the light or dark variants reads better against your background.
Do I need permission to use it?
No sign-up or permission needed — it is free to use on any site, personal or commercial, as long as the citation is genuine and the badge links to the page you actually referenced. See the do's and don'ts above.
Where does the badge link if I pick "General"?
To our Methodology page, which explains how every formula on the site is documented, sourced, and tested. Pick a specific calculator instead whenever you can — it is more useful to your own readers and more accurately reflects what you cited.