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Wire-Cable Voltage Drop Calculator

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Wire Cable Voltage Drop Calculator | DC AC Cable Sizing Tool
TYPE
Ω·m
TYPE
V
A
Please enter valid values.
RESULTS
Voltage Drop
Voltage Drop Percent
Resistance

Input Parameters Specification

MaterialSelect conductor material such as copper, aluminium, silver or nichrome to load resistivity automatically.
Wire DiameterEnter AWG, inch or millimeter conductor size to calculate cross-sectional area from diameter.
Wire LengthUse one-way cable length. The calculator internally includes return path resistance for voltage drop.
Current TypeSelect DC, AC single phase or AC three phase to apply the correct drop factor.

Practical Operational Examples

DC Copper Cable

Material: Copper
Wire: 10 AWG
Length: 50 feet
Voltage: 24 V
Current: 10 A

Three Phase Feeder

Material: Aluminium
Wire: 25 mm
Length: 40 meters
Voltage: 415 V
Current: 60 A

Diagrams & Theory

Voltage drop happens when conductor resistance reduces delivered voltage between the power source and load. Longer cable, smaller diameter and higher current increase wire loss.

SOURCE Vin LOAD Vload Current flow One-way cable length Voltage drop across cable

Formulas & Mathematical Logic

Wire area: A = π × d² / 4
Cable resistance: R = 2 × resistivity × length / area
Voltage drop: Vdrop = current × resistance
Three phase adjustment: Vdrop = Vdrop × 1.732 / 2
Voltage drop percent: Vdrop percent = Vdrop / supply voltage × 100

The calculator converts AWG, inch or millimeter wire diameter into meters, converts feet into meters when required, then computes resistance, voltage drop and percentage loss.

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About this tool

Wire-Cable Voltage Drop Calculator is a free online calculator tool. Use it to get instant, accurate results for your electronics calculations.