Wire Resistance Calculator

Your details

Select the conductor material. Each material has a fixed resistivity at 20 C and a temperature coefficient.
Toggle to pick a standard AWG size instead of entering a diameter directly.
Total one-way length of the conductor.
m
Outer diameter of the conductor (not including insulation). Used to compute the cross-sectional area.
mm
The temperature at which the wire operates. Resistance increases with temperature for most metals.
C
The current flowing through the wire. Used to compute voltage drop and power loss.
A
Resistance at operating tempLow resistance
0.0522Ohm

DC resistance of the full wire length at the specified temperature

Resistance at 20 C0.0522Ohm
Conductance19.1452S
Cross-sectional area3.3006mm2
Voltage drop0.2612V
Power dissipated1.3058W
Resistance per metre5.223mOhm/m
R at 20 C (Ohm)0.0522
R at temp (Ohm)0.0522
Voltage drop (V)0.2612

Resistance: 0.0522 Ohm at 20 C

  • A 10 m Copper wire with this cross-section has a DC resistance of 5.223e-2 Ohm at 20 C.
  • At 5 A, the wire drops 0.2612 V and dissipates 1.3058 W as heat.
  • Copper is the most common choice for electrical wiring due to its low resistivity and ductility.

Next stepFor a two-way circuit (current travels out and returns), double the wire length in the calculator to get the total loop resistance and voltage drop.

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