Scientific Calculator

Production-oriented scientific calculator built with Next.js 16 App Router, React 19, TypeScript, Tailwind CSS 4, math.js, and Vitest 5.

What is included

Scientific calculator with DEG/RAD/GRAD modes
Fractions, scientific notation, powers, roots, logarithms, trigonometry, factorials, combinations and permutations
Keyboard input, paste support, memory, history, copy result, light/dark mode
Dedicated calculator pages for common search intents
Mathematics guides with practical explanations
Metadata, canonical URLs, Open Graph/Twitter metadata, JSON-LD, sitemap, robots.txt, manifest, breadcrumbs, and 404 page
Automated calculator-engine tests
Responsive and accessible controls

Requires Node.js 22.12+.

npm install
npm run dev
npm run typecheck
npm run test
npm run build

For PowerShell environments where npm.ps1 is blocked, use npm.cmd instead.

Set NEXT_PUBLIC_SITE_URL in Vercel to the canonical production origin, for example:

https://your-domain.com

This value is used by canonical URLs, Open Graph metadata, sitemap, robots.txt, and JSON-LD.