Simple software for electricians.
Replace load calculations, code lookups, and clunky diagramming software with purpose-built software, you'll actually use.
Save time, work less.
Some sparkies use it.
Tools should work, you should work less
If you install EV chargers, heat pumps, solar - or find yourself staring at an electrical panel at least once a week, we can help.
Run load calculations, without math
Enter all property details on your phone, and run residential and commercial compliant calculations.
Learn more about the Load CalculatorBuild line diagrams, like it's 2026
Drag, drop, and export drawings with a simple interface. No more wrestling with outdated software.
Learn more about the Line Diagram toolField-Ready
Designed for job sites, not just desks. Use it standing in a panel room.
NEC-Compliant
Calculations and code lookups are grounded in actual NEC text. Not guesswork.
Any Device
Runs in the browser on phones, tablets, and laptops. Nothing to download.
Fast and Simple
No training needed. If you can fill out a form, you can use Breakerbox.
Code Lookup
Get trusted electrical code answers through a simple chatbot. Ask questions in plain English, get responses backed by actual code.
Learn more about Code LookupCustomers talked about us
Breakerbox Lives Where You Work
Phone in the truck, laptop in the office, tablet on the jobsite. Open Breakerbox on whatever device you have and pick up exactly where you left off. Run a load calc on a service call, look up a code on the way to the next job, sketch a line diagram from your desk.
Replaces Spreadsheets, PDFs, and Pen-and-Paper
No more juggling Excel templates, scrolling through 1,000-page code PDFs, or sketching diagrams on the back of a receipt. One simple set of tools that does the things electricians do every week — and stays out of your way the rest of the time.
It takes 5 mins to start
No demo calls. No onboarding or training. Sign up, log in, and start working. But we are here if you need us.
Get in touchCreate your account and start using Breakerbox right away. No sales call required.
Full access to every tool for 14 days. No credit card up front. Cancel anytime.
Phone, tablet, or laptop. Breakerbox runs in your browser -- use it wherever you work.
How to use Breakerbox
See all resources
How to run a residential load calc in under 10 minutes
A step-by-step walkthrough of the Breakerbox load calculator for single-family homes.
Learn more about residential load calculations
NEC Article 220 quick reference for demand factors
Common demand factor tables and when to apply them, pulled straight from the code.
Learn more about NEC Article 220 demand factors
EV charger installations: what the NEC says about load calculations
How to handle EVSE loads under NEC 625 and what it means for your service calcs.
Learn more about EV charger load calculations
Building your first line diagram in Breakerbox
A quick guide to creating clean circuit diagrams you can hand to inspectors.
Learn more about building your first line diagram