Calculators that compute against your inputs.
Eight tools that AI Overviews cannot replace, because the answer depends on what you put in. Each one is carefully built against published references — ACI, ADA, NREL, USDA — and the math, citations, and edge cases are all visible.
No login. No ads on the result. No tracking pixels you can see.
Construction trades
Four tools for the field — code-aware, no fluff.
Outdoors & energy
Tools for the homestead and the roof.
Specialist niches
Two technical calculators for specific work.
Why this site exists
Most calculator websites are spam — autogenerated, ad-saturated, and wrong in ways that fail an inspector or a contractor's estimate. The same goes for the one-line answers that AI Overview now serves above the search results.
A real calculator does math the user can verify, cites its sources, and acknowledges when a different reference is the right tool. That's what this site is. Eight calculators, no plans to grow rapidly, no plans to compete on volume. If a calculator here passes inspection or saves an order, we did our job.
Built and maintained by Michael (michael@complianceghost.com). Open source / open data — see the data licensing page for every source.