What does Voltage Drop Calculator do?
VoltageDropCalculator.net is a free voltage drop and wire sizing tool for electricians, electrical engineers, contractors and students. Enter the load in amps, watts or horsepower, pick a system voltage (12V/24V/48V DC, 120/208/240/277/480V AC, single or three phase), copper or aluminum, PVC or steel conduit, run length and parallel sets, and it shows the voltage drop, voltage at the load and a suggested conductor size compared with the NEC 3% branch / 5% total recommendation, based on NEC Chapter 9 Table 8 resistance values. It also has DC, AC, ampacity derating, conduit fill, max circuit length, motor starting, kVA-to-amps and Ohm’s law calculators. No signup. Reference only; verify against the adopted code.
Who should use Voltage Drop Calculator?
contractors and students, electrical engineers, Electricians are the clearest fit based on how the product is positioned.
Best fit
Pricing: Free
Platforms: Web
How much does Voltage Drop Calculator cost?
Free Check the provider’s own page for the latest pricing, packages and terms.
Details, pricing and availability can change. We use provider information, verified owner updates and editorial review where available. Check the provider’s own page before making a purchase, booking or important decision.
Profile last updated 29 Oct 2026.
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