• Calculator Main
• Voltage Drop
• Reel Selection

This is a calculator for the estimation of the voltage drop of an electrical circuit based on the wire size, distance, and anticipated load current. Please note this calculator assume the circuit is operate in a normal condition—room temperature with normal frequency.

The actual voltage drop may vary depend on the condition of the wire, the conduit being used, the temperature, the connector, the frequency etc. It is recommended that the voltage drop should be less than 5% under the fully loaded condition.

Required Data Entry
Select Material	- Wire Types - Copper Aluminum
Select Size	18 AWG 16 AWG 14 AWG 12 AWG 10 AWG 8 AWG 6 AWG 4 AWG 3 AWG 2 AWG 1 AWG 1/0 AWG 2/0 AWG 3/0 AWG 4/0 AWG 250 kcmil 300 kcmil 350 kcmil 400 kcmil 500 kcmil 600 kcmil 700 kcmil 750 kcmil 800 kcmil 900 kcmil 1000 kcmil 1250 kcmil 1500 kcmil 1750 kcmil 2000 kcmil
Select Voltage and Phase	120 Volts 1-phase 240 Volts 1-phase 208 Volts 3-phase 3-wire 120/208 Volts 3-phase 4-wire 277 Volts 1-phase 480 Volts 3-phase 277/480 3-phase 4-wire 24 DC or 1-phase AC 48 DC or 1-phase AC ************************************
Enter Cable Length	Feet
Enter Load	Amps
Calculated Results
Estimated Drop	Volts
Load At Circuit End	Volts
Voltage Drop	Percentage
Conductor	CMA

Basic Voltage Drop Law

V_drop = IR

where:
I : the current through the object, measured in amperes
R : the resistance of the wires, measured in ohms