📈 ACT NOW. Prices for new subscribers go up this week. Lock in our lowest rate now.

Book more jobs with better customer follow-ups

Helping

contractors win more jobs in less time

Electrical design tools built for the digital age

Don't slow down your sales. Simplify permits and inspections with faster design tools.

Get started ->

or learn more

Book a demo ->

Electrical design tools
built for the digital age

Don't slow down your sales. Simplify permits and inspections with faster design tools.

Get started ->

or learn more

Team dashboard

Load calculations

NEC online chatbot

Single line diagrams

Load calculations

Create load calcs easier than ever

Stop using manual spreadsheets. Create accurate calculations with automatic property data and panel photo processing. Generate instant PDF reports for customers, permits, and inspections.

Try for free ->

Single line diagrams

Design single line diagrams in seconds

No need to hire a designer or an engineer. Save time on projects with easy drawing tools for single line diagrams. Choose a template from our library, update the drawing, and generate a downloadable PDF.

Try for free ->

NEC online chatbot

Review the NEC without turning a page

Stop navigating the National Electrical Code alone. Use our AI chatbot as a supplement to the NEC, helping you reference the latest rules, look up calculations, prepare for the exam, and more.

Try for free ->

Team dashboard

Design with your whole team in one place

Collaborate on load calculations, single line diagrams, and more with a single team dashboard. Easily save and store documents for future review. Use our mobile app for design and planning on-the-go.

Load calculator demo

Hear it from a pro

See how Kevin from Bella Electric San Diego uses Kopperfield design tools to save time and close more customers.

Get started ->

or learn more

Multiple design tools.
One low price.

Get started ->

or learn more

Trusted by contractors and inspectors nationwide

“I was under the gun to get a load calculation for a generator project and found your website. Load calcs are a pain but your tool was very helpful.”

Daniel, electrical contractor

“I could quickly select the correct kilowatt rating and have everything pop up in the tool. It made calculating load fast and give a nice looking page to send to a customer.”

Jessica, electrical shop owner

“The power company now requires load calcs for everything. I used to do them by hand, but after finding your site, I gave it a try. It’s definitely easier and saves time.”

Joe, electrical contractor

“The Kopperfield tool helps with load calculations and avoids common mistakes [...]. I refer Kopperfield’s tool to contractors I work with.”

Reina, city electrical inspector

"I really love the freaking load calculator."

Perry, electrical contractor

“It was super fast and easy— took me about 10 to 15 minutes to get everything ready for the proposal. Really quick, it was great.”

Justin, electrical shop owner

“Used your load calc tool for an ADU project where the city required load calcs and meter sizing. Your tool was helpful in determining the amperage requirements.”

Adam, draftsperson

“I do a lot of EV charger installs, and getting permits can be a hassle. Your tool sped up the process. I liked how simple it was to use, and I’ve already used it a couple of times.”

Jorge, electrical shop owner

“As soon as I used the load calc tool I could see why you called it Kopperfield, because it’s like magic!”

Tim, electrical shop owner

“I was under the gun to get a load calculation for a generator project and found your website. Load calcs are a pain but your tool was very helpful.”

Daniel, electrical contractor

“I could quickly select the correct kilowatt rating and have everything pop up in the tool. It made calculating load fast and give a nice looking page to send to a customer.”

Jessica, electrical shop owner

“The power company now requires load calcs for everything. I used to do them by hand, but after finding your site, I gave it a try. It’s definitely easier and saves time.”

Joe, electrical contractor

“The Kopperfield tool helps with load calculations and avoids common mistakes [...]. I refer Kopperfield’s tool to contractors I work with.”

Reina, city electrical inspector

"I really love the freaking load calculator."

Perry, electrical contractor

“It was super fast and easy— took me about 10 to 15 minutes to get everything ready for the proposal. Really quick, it was great.”

Justin, electrical shop owner

“Used your load calc tool for an ADU project where the city required load calcs and meter sizing. Your tool was helpful in determining the amperage requirements.”

Adam, draftsperson

“I do a lot of EV charger installs, and getting permits can be a hassle. Your tool sped up the process. I liked how simple it was to use, and I’ve already used it a couple of times.”

Jorge, electrical shop owner

“As soon as I used the load calc tool I could see why you called it Kopperfield, because it’s like magic!”

Tim, electrical shop owner

“I was under the gun to get a load calculation for a generator project and found your website. Load calcs are a pain but your tool was very helpful.”

Daniel, electrical contractor

“I could quickly select the correct kilowatt rating and have everything pop up in the tool. It made calculating load fast and give a nice looking page to send to a customer.”

Jessica, electrical shop owner

“The power company now requires load calcs for everything. I used to do them by hand, but after finding your site, I gave it a try. It’s definitely easier and saves time.”

Joe, electrical contractor