AmpRule
Electrician Calc & NEC Ref
About
This app provides electricians with essential calculations and references for electrical work, including wire sizing, voltage drop, and conduit fill. It offers quick access to NEC code citations for every result and works offline. Save and export calculations as PDFs for inspection purposes.
What's New in AmpRule
1.0.1
August 16, 2026
Now available in Spanish on the App Store. The app itself has been bilingual since launch - this update brings the store listing in line so Spanish-speaking electricians can actually find it. No changes to calculations or code data.
MoreIn-App Purchases
$14.99
AmpRule Pro
One-time unlock. All calculators. No subscription.
Developer apps
FAQ
Does AmpRule have ads?
No, AmpRule is ad-free. The app description explicitly states 'no ads' and is designed for uninterrupted use on the job site.
What NEC editions does AmpRule support?
AmpRule includes support for the 2017, 2020, 2023, and 2026 NEC editions. You can switch between editions within any calculator, and tables, results, and cited sections will update accordingly.
Can I use AmpRule without an internet connection?
Yes, AmpRule is built for the jobsite and works fully offline. This means you can access all its features and calculations without needing an internet connection.
How does AmpRule handle pricing and subscriptions?
AmpRule is a one-time purchase that unlocks all features, including future NEC editions. There is no subscription model, and the app clearly states 'NO SUBSCRIPTION. EVER.'
What is the age rating for AmpRule?
AmpRule has an age rating of 4+. This indicates it is suitable for a wide audience and does not contain mature content.
How often is AmpRule updated?
The latest version of AmpRule is 1.0.1, and it was last updated on August 16, 2026. Future NEC editions are also included for free, suggesting ongoing support.
Can I export my calculations from AmpRule?
Yes, you can save and export your calculations as a PDF. This feature is useful for showing your work to inspectors, as the exported PDF includes the relevant code citations.
What makes AmpRule's search feature useful?
AmpRule's search is designed to understand how electricians work. You can search by section number (e.g., 310.16), task (e.g., wire size), or even job-site slang (e.g., smurf tube), without needing exact wording.