About Reuven

How the Calculators Are Built

Every calculator follows the same discipline. It implements published methods from recognized codes and references — Eurocodes, ACI, AISC, ASHRAE, NEC, AASHTO, and the standards each page cites — rather than ad-hoc approximations. The formulas used are printed on the page, so you can check the math by hand. Each tool ships with a worked example, and its calculation engine is covered by an automated test suite that pins results to independently derived values, so a code change that shifts an answer fails the build.

All computation happens in your browser: nothing you type is uploaded, stored, or shared. That also means the tools are fast and work the same way on a site visit in the field as at a desk.

Accuracy & Limitations

These calculators are aids for preliminary design, checking, and learning — not a replacement for engineering judgment or for the governing code in your jurisdiction. Standards differ between countries and editions, and a method valid for one situation may not cover yours. Verify results against project-specific requirements before using them in final documentation. The terms of use spell this out in full.

When we find an error — or you report one — we fix the calculation, add a regression test so it stays fixed, and update the page. Corrections are the most valuable mail we get.

Who Is Behind It

Reuven is an independent project, built and maintained by a small team with backgrounds in engineering and software. The project started with a single window-fabrication calculator and grew tool by tool as colleagues asked for the next one. It is funded by unobtrusive advertising rather than subscriptions, so the calculators stay free.