Most calculator sites are a graveyard of orphan pages: 50 tools, no structure, everything competing against everything. I rebuilt mine — seecalc.com — around a hub-and-spoke architecture on Next.js with ISR, and it changed how Google treats the entire domain. Here's the full setup.
The problem with flat calculator sites
My first version was flat: /date-calculator, /cd-rate-calculator, /cap-rate-calculator — all siblings, all fighting for crawl budget and authority independently.
Two symptoms showed up in Search Console:
Click concentration. The homepage absorbed most clicks while individual tools sat at positions 10–20 — close enough to taste page one, never getting there.
