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Voltage Drop Calculator

Makes Voltage Drop Calculation a Breeze

This application could also be called "Feeder Sizer" as it provides all information required to size feeders. Colour coding of maximum allowable ampacity values - according to CEC or NEC - helps choose the correct wire size. Voltage drop values are updated on the fly, conduit size is shown and if you size the feeder for a motor, Full Load Ampers for typical motors are built-in.

With rising cost of electricity you may find the "Feeder Efficiency Tip" useful. It informs when it may be beneficial to increase wire size above the minimum required by code. Download.

Voltage Drop Calculator - Calculation Software


Helps select proper wire and conduit size. Estimates full load current of motors based on Horse Power rating.


Enter values in any sequence. Has built-in NEC & CEC wire ampacity tables for US and Canada. Prints results.

Easy to use

All terms and definitions are explained on screen. No manual required.

New Feature

Calculates the cost of energy lost during feeder operation.


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 impendence coefficients." – Softpedia

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