Electrician Toolbox support

Questions, bug reports or an idea for a new calculator? Send an email and you'll get a reply from the person who built the app.

It helps to include your iPhone or iPad model, your iOS version, and what you were doing when the problem happened. A screenshot is even better.

Restoring Pro on a new phone

Sign in to the App Store with the same Apple ID you bought Pro with, then open the app. Pro usually comes back on its own. If it doesn't, tap any Pro tool or go to Settings, choose Unlock Pro, then tap Restore purchase.

Refunds

Purchases are handled by Apple, so refund requests go through Apple at reportaproblem.apple.com.

Your data

Jobs, notes, photos and history are stored only on your device and aren't backed up by the app. Deleting the app deletes them. See the privacy policy.

About the results

Results are engineering estimates from standard physics formulas, which are shown under each answer. They don't replace your local electrical code, the authority having jurisdiction, the nameplate, manufacturer data or your own judgment. Verify before you install.