Online resistance calculator

Online calculator

Compute online the resistance of a component, wire or cable based on

material or resistivity ;
length ;
cross-sectionnal area.

Material

Resistivity

\( \times 10^{-8} \: \Omega.m \)

Length

m

Area

mm²

Resistance

Ω

Explanation

The formula used in this calculator is:

$$ R = \dfrac{l}{S} \times \rho $$

with:

\( R \) is the resistance expressed in ohms [Ω]
\( l \) is the length expressed in meters [m]
\( S \) is the cross-sectional area expressed in square meters [m²]
\( \rho \) is the resitivity expressed in ohms metre [Ω.m]

For the values of resistivity, see the following table.

Table of resistivity

The following table presents the most used resistivity. For more values, please see this page.

Material	Resistivity
Silver	\( 1.59 \times 10^{-8} \: \Omega.m \)
Copper	\( 1.72 \times 10^{-8} \: \Omega.m \)
Gold	\( 2.44 \times 10^{-8} \: \Omega.m \)
Aluminium	\( 2.65 \times 10^{-8} \: \Omega.m \)
Tungsten	\( 5.6 \times 10^{-8} \: \Omega.m \)
Brass	\( 7 \times 10^{-8} \: \Omega.m \)
Nickel	\( 6.99 \times 10^{-8} \: \Omega.m \)
Iron	\( 9.7 \times 10^{-8} \: \Omega.m \)

See also

Last update : 05/14/2021