Four field-ready calculators for electricians, apprentices and contractors. Big inputs you can use with gloves on, code references on every result, and no signal required.
What's inside
Voltage drop: single and three phase, copper or aluminum, feet or metres, with pass/fail against 3% and 5%.
Wire size: smallest conductor that meets ampacity, 240.4(D), continuous load and voltage drop.
Conduit fill: EMT, PVC and RMC, mixed conductor sizes, smallest conduit that works.
Ohm's law: any two of volts, amps, ohms and watts.
Built for the job site
NEC or CEC, imperial or metric, set once.
Results show the table and rule behind them.
Dark mode for bright sun and dark crawlspaces.
Pro: save calculations by job and export a PDF for inspectors and clients.
Private by design: no accounts, analytics or ads.
Try it: Ohm's law
Frequently asked questions
What does Wirewright cost?
The app and all four calculators are free. Wirewright Pro is an optional subscription that adds saved job history and PDF export. Prices are shown in the app before you buy.
Does it work offline?
Yes, completely. Nothing is sent to a server, and there are no accounts, ads or tracking.
Does it support the Canadian Electrical Code?
Yes. Choose NEC or CEC in Settings. CEC mode applies the Rule 8-102 voltage drop limits and Rule 12-910 conduit fill limits, and you can work in metres.
Which phones are supported?
iPhone and Android phones. The layout also works on tablets.
