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Buying Our Calculators

Registration Fee

Download and try our calculation software for up to thirty days. If you decide to keep it, please register it for $30 U.S. or $30 Canadian. The one time license fee covers all three calculators—Voltage Drop Calculator, Lighting Level Calculator and Underground Cable Ampacity Calculator.

Click on the PayPal button below to pay now. Once your payment is accepted, please allow us three to ten business days to email your license key. Alternatively, mail your payment with this printable form in .pdf, .rtf, .txt, or Word (.doc).

$30 U.S.
$30 Canadian
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Sitewide and Company-wide Licenses

Sitewide License

Sitewide License covers all three calculators on all workstations at one company location.

$200 U.S.
$200 Canadian

Company-wide Multi-site License

This license covers all three calculators on all workstations at a company or corporation across its multiple locations.

$500 U.S.
$500 Canadian



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Users Write

"I used to make myself coffee before doing these calculations."

"I've used this calculator for voltage drop on and off for about a year now...I highly recommend it"

"Now I've got time to focus on things that matter. "

Media Reviews

"Electrical Calculator proves to be a useful and reliable application whose main purpose is to provide electrical engineers with the right tools when calculating the secondary transformer voltage and the transformer impedance coefficients." Softpedia

"NEC Ampacity Calculator is an efficient piece of software ... dedicated to users that have an idea about electrical systems." Softpedia