A free reference calculator for electricians and electrical engineers, covering three electrical codes in one place.
OhmWorks was built to solve a specific, everyday problem for electrical tradespeople and engineers: quickly and reliably sizing cables, checking voltage drop, and verifying earthing/grounding — without digging through a physical code book or a spreadsheet you built yourself years ago and no longer fully trust.
It's organized around three electrical codes, each as its own section of the app:
Electrical work doesn't stay inside one jurisdiction's rulebook. An engineer working across the Philippines, Australia, and projects that reference the US NEC shouldn't need three different apps — or three different mental models — for the same underlying physics. OhmWorks keeps the calculation logic for cable sizing, voltage drop, PV/solar DC sizing, and earthing consistent in structure across all three tabs, while using each code's own real ampacity, derating, and grounding tables underneath.
Every reference table in OhmWorks is either drawn directly from the cited standard's own tables (with the exact table number and edition noted in the app), or, where a source document wasn't yet available, clearly marked as a placeholder pending verification. We'd rather show you an honest "not yet verified" than a confident-looking number that isn't actually sourced from the code.
Electricians sizing a residential or light commercial run. Solar installers checking DC string cable sizing and voltage drop before a permit submission. Engineering students cross-checking a hand calculation. Anyone who needs a fast, code-referenced second opinion — not a replacement for professional judgment or the actual code text.