Voltage Drop Calculator

What is Voltage Drop Calculator?

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, a knowledge base, glossary and case studies. No signup. Reference only; verify against the adopted code.

Voltage Drop Calculator features

• Calculates voltage drop, voltage at the load and a suggested conductor size from amps, watts or HP input
• Supports 12V/24V/48V DC and 120/208/240/277/480V AC, single or three phase
• Copper or aluminum conductors, PVC or steel conduit, run length and parallel sets
• Compares results against the NEC 3% branch / 5% total recommendation using NEC Chapter 9 Table 8 resistance values
• DC, AC, ampacity derating, conduit fill, max circuit length, motor starting, kVA-to-amps and Ohm's law

Who uses Voltage Drop Calculator and for what

• Electricians sizing branch circuit conductors and checking voltage drop against 3%/5% limits
• Electrical engineers and contractors verifying run length and conductor size for AC or DC systems
• Students and instructors working through NEC-based voltage drop examples
• Solar PV and EV charger installers estimating drop over a given run with copper or aluminum conductors

Voltage Drop Calculator FAQ

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