About

Genba Dentaku (“the field calculator”) is a free collection of practical calculators for the construction trades — electrical, structural, and civil — that run entirely in your browser. No account, no install, no fees. This US edition is built around US standards (NEC, ASCE 7, AISC, ASTM) and inch-pound units.

The site is built and run by reiridge, a working engineer with years of experience in telecom infrastructure design, and an independent product maker who takes projects from requirements through design, implementation, and operation solo. Genba Dentaku started as a tool for the job site and grew into a broad set of field calculators.