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 typically be divided into simpler circuits in parallel and series to determine the total resistance (by summing the resistance of each portion). A calculator for estimating the resistance of a conductor based on size and conductivity is also included.
Resistors in parallel
Provide all of the resistance values in parallel, separated by a comma "," and click the "Calculate" button to determine total resistance.
Resistors in series
Provide all of the resistance values in series separate d by a comma "," and click the "Calculate" button to determine total resistance.
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 
Resistors are circuit elements that impart electrical resistance. While circuits can be highly complicated, and there are many different ways in which resistors can be arranged in a circuit, resistors in complex circuits can typically be broken down and classified as being connected in series or in parallel.
Resistor in parallel:
The total resistance of resistors in parallel is equal to the reciprocal of the sum of the reciprocals of each individual resistor. Refer to the equation below for clarification:
R_{total} = 

Resistor in series:
The total resistance of resistors in parallel is simply the sum of the resistances of each resistor. Refer to the equation below for clarification:
R_{total} = R_{1} + R_{2} + R_{3} ... + R_{n}
Resistance of a conductor:
R = 

Where:
L is the length of the conductor
A is the crosssectional area of the conductor
C is the conductivity of the material