Resistor Calculator

The following are tools to calculate the total resistance of a group of resistors in parallel or in series. A complex circuit can normally be divided into simple parallel and series circuits for the total resistance. Also included is a calculator to estimate the resistance of a conductor based on size and conductivity.

Resistors in Parallel

Please provide all the resistance values in parallel separated by comma "," and click the "Calculate" button to use.


Resistors in Series

Please provide all the resistance values in series separated by comma "," and click the "Calculate" button to use.


Resistance of a Conductor

Use the following to calculate the resistance of a conductor. This calculator assumes the conductor is round.

Length:
Diameter:
Conductivity: S/m       Or Select Material


RelatedOhms Law Calculator

Equations:


Resistor in parallel:

Rtotal = 1/(1/R1 + 1/R2 + 1/R3 ... + 1/Rn)


Resistor in series:

Rtotal = R1 + R2 + R3 ... + Rn


Resistance of a conductor:

R = L/(A*C)

Where:
    L is the length of the conductor
    A is the cross-sectional area of the conductor
    C is the conductivity of the material