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📱New phone app. Get unlimited load calcs from your phone with our new app for Apple and Android. Subscribe to our Tools plan to get started. 

Electrical load calculations made easy

Stop using manual spreadsheets. Now introducing an easier way for licensed electricians to do electrical load calculations. Use our free tool to get accurate results with an instant PDF report that helps finish residential inspections and close customers faster.

Try for free ->
Complete accurate calculations in minutes
Easy-to-use interface
Pre-loaded with common appliances and their standard output values from the National Electrical Code
Calculations based on NEC rules
Utilizes default values from the 2023 National Electrical Code, Section 220.83, including values for EV chargers
Inspector-ready reports
Instantly generates a downloadable PDF printout of your calculation to share with inspectors or customers
Smart property data
Automatically detects location and surfaces property data including building square footage for easier calculations
The Kopperfield tool helps with load calculations and avoids common mistakes, such as handling an EV charger in a load calc. I refer Kopperfield’s tool to contractors I work with.
Reina M, City Electrical Inspector
Supporting standard load calculation scenarios
Single family homes (optional method)
Accessory dwelling units and additions
Multi dwelling units (i.e., duplex, triplex, quad)
Heat pumps
208V single phase dwellings
Generators and batteries (coming soon)
Unlock unlimited load calcs
Our free load calculator is limited to 2 free uses. Get more out of your load calcs when you subscribe to our paid plan.
Unlimited load calcs
Branded templates
Custom default values
Team dashboard

Library of all completed calculations

AI-powered panel photo
processing
Electrical load calculation in 3 easy steps
Try for free ->
get a free estimate

1

Add property info

Enter the address of the job you’re working on and we’ll pull in the square footage to start the home electrical load calculation.

2

Edit the list of appliances

We’ve pre-loaded a list of common appliances and standard output values. Simply check and adjust them to match what you see on the property.

virtual site visits

3

Get your free,

shareable PDF printout

Input your preparer’s information and we’ll generate a free PDF that you can attach to your inspection report.

More tools for your electrical shop
NEC online chatbot
Get answers to your questions about the National Electrical Code
Single line diagram
Generate single line diagrams from a library of common templates
Proposal builder
Customize proposals and share mobile-friendly quotes and invoices
Electrical load calculation common questions

Is there a limit to the free load calculator?

What scenarios can I use the load calculator for?

What single line diagram templates are available?

Who is this tool made for?

Where can I get help with the load calculator?

A quicker and easier way to do

electrical load calculations

Try it now ->
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