Developers

MCP server — 6 tools

Model Context Protocol endpoint. Works with Claude Desktop, ChatGPT, Cursor, Cline and anything else that speaks MCP. The tools share their arithmetic with this website, so a number your assistant gives you is the number this page would give you.

{
  "mcpServers": {
    "rough-estimator": {
      "url": "https://api.cosyslabs.com/rough-estimator/api/mcp"
    }
  }
}

• concrete_calc — Cubic yards, cubic metres and 40/60/80-lb bag counts for slabs and footings.
• gravel_calc — Tons and yards for a driveway or patio at a given density.
• roofing_calc — Squares and shingle bundles with pitch correction applied.
• paint_calc — Gallons of paint and primer for a surface area and coat count.
• lumber_calc — Board feet, and optional cost, for a lumber order.
• blog_search — Keyword search across the on-site guides and FAQ index.

Full MCP setup guide, including Claude Desktop config paths →

Embeds

Drop any of the 43 calculators into your own page. The embed runs entirely client-side, sets no cookies, and inherits nothing from this site's analytics.

<iframe
  src="https://roughestimator.com/concrete-calculator?embed=1"
  width="100%" height="640" loading="lazy"
  style="border:1px solid #e5e5e5;border-radius:12px"
  title="Concrete Calculator by Rough Estimator"
></iframe>

Browse every embeddable calculator →

Schemas

• Open Calculator Standard v1 — a machine-readable description of what an estimator takes and returns, so a tool written against one calculator works against all of them.
• /openapi.json — OpenAPI description of the backend endpoints.
• /llms.txt — a plain-text site map written for language models rather than crawlers.
• /.well-known/ai-plugin.json — plugin manifest.

Security posture

Headers are set in public/_headers and served by Cloudflare Pages on every response. We publish them rather than claim a grade, because a grade is a screenshot and headers are checkable.