How I Built 468 Calculator Tools with Next.js SSG and Zero Backend

How I Built 468 Calculator Tools with Next.js SSG and Zero Backend I built keisan-tools.vercel.app — a site with 468 calculator tools, all statically generated, running on Vercel's free tier with zero backend. Here's the technical breakdown. Why 468 Calculators? Programmatic SEO (pSEO). Each calculator targets a specific long-tail keyword: "BMI calculator" "mortgage payment calculator" "compound interest calculator" "日本語 pension calculator" (for Japanese users) 468 pages = 468 chances to rank in Google. Each page is a self-contained tool — not a thin content page, but a fully functional calculator with explanations. Architecture keisan-tools/ ├── src/ │ ├── app/ │ │ ├── [category]/ │ │ │ └── [tool]/ │ │ │ └── page.tsx ← Dynamic route, static at build │ │ └── layout.tsx │ ├── tools/ │ │ └── definitions.ts ← All 468 tool configs │ └── components/ │ ├── Calculator.tsx ← Generic calculator component │ └── SEOHead.tsx ← Per-page meta tags ├── next.config.js └── package.json Key Design Decis