Choose language

PL, EN, ES, DE, FR, RU


Wire resistance, length and diameter calculator


With this calculator, you can calculate the resistance of the cable, knowing the material it is made of. You can also calculate the length of the conductor and the conductor diameter or the conductor cross-section area.



Resistance, length and diameter of wire calculator












Resistance, length and diameter of wire calculator - information



The resistance of a conductor with the same cross-section to the direction of current flow is proportional to the length of the conductor, inversely proportional to the cross-section, and depends on the material, which is expressed by the relationship (sometimes called Ohm's second law):

$$ R = \rho \cdot \frac {L}{S} $$ where:
R – conductor resistance,
L – conductor length,
S – conductor cross-sectional area,
ρ – conductivity (specific resistance) of a conductor, a parameter characterizing the material.

Given the diameter of a conductor, the cross-sectional area of a conductor can be calculated using the formula:

$$ S = \frac{\pi \cdot d^2}{4} $$

where:
S – conductor cross-sectional area,
d – conductor diameter,


After transformations

Wire diameter:
$$ d = \sqrt {S · 4 \over π} $$

Cross-sectional area:
$$ S=\rho \cdot \frac{L}{R} $$

Wire length:
$$ L = \frac{S \cdot R}{\rho} $$





Users of this calculator also used

Calculator of reactive power from voltage and current

The reactive power calculator in AC circuits will help you easily calculate reactive power, voltage and current.

ROT47 cipher - encoder / decoder

ROT47 cipher online encoder and decoder. Encrypt and decrypt any cipher created in a ROT47 cipher. You can use any shift and additionally a key for more precise text encoding.

Child's blood group

You will calculate with fairly high accuracy the likelihood of your baby having a particular blood group.

Density, mass, volume

With this calculator you can calculate the density of the substance, i.e. specific mass. The calculator will also help to determine the mass of the substance and the volume it occupies.

Am I going bald? When will I go bald?

Are your hair falling out, are you starting to go bald? Use this calculator and check the probability and age at which you may be at risk of total hair loss.

Online tool for drawing graphs of any function.

With this online function graph plotter, you can draw any function. On one graph you can draw any three functions and compare their parameters. You can create graphs for many equations and functions.

Fraction calculator - adding fractions step by step with explanation

With the Fractions Calculator, you can add any two mixed numbers or proper and improper fractions.
Fractions Calculator will show you the result of operations on fractions step by step and will give you explanations of the operations performed to add fractions. You will learn how to simplify fractions, how to find a common denominator, how to find the least common multiple and the greatest common divisor.



Online calculator