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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

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