What this site is
Calcs is a free catalog of online calculators built around three rules.
1. Math runs in your browser
Every calculator is a static page with the math wired up in JavaScript that runs locally. We never send your inputs to a server. The page itself is plain HTML served from disk by Caddy — no Python, no Node, no database. Loads in under a second on any connection.
2. Every page explains itself
The result alone isn't useful. Every calculator includes the formula (rendered with KaTeX), 2–4 worked examples with real numbers, a short FAQ for the common edge cases, and external references — usually Wikipedia, NIST, or a primary research paper. If we get it wrong, the references make it easy to check.
3. No popups, no signup, no ads (yet)
No newsletter modals, no "accept cookies" walls, no chat bubbles, no signup walls. The site uses zero cookies and zero tracking scripts. If we eventually add advertising, it will be a single static slot — no behavioral targeting, no auction stack, no third-party JavaScript bloat.
How it's built
Next.js 16 with static export, Tailwind 4 for the neon design system, KaTeX for formula rendering, Caddy serving the result. Each calculator is a small React component plus an English content file with formula, examples, FAQ, and references. The whole site is open enough that swapping a calculator's formula takes one file edit and a rebuild.
What we won't do
- Mass-produce thin pages with AI-generated content (Google's Helpful Content Update penalty risk).
- Track you. Ever.
- Hide the formula behind a paywall or "premium" tier.
- Use clickbait titles or fake urgency.
Roadmap
The site is in active development. Current goals: more calculators in every category, client-side search across the catalog, and Open Graph image generation per page for nicer link previews. Long-term: 1000+ calculators, all with the same depth.
Hosted on a small server in Germany. Domain: calcs.maltor.com.