Resistors in parallel

Calculator and formulas for calculating resistors in parallel


When resistors are connected in parallel, the current is distributed over the individual resistors.

Parallel connection of resistors

Calculate total resistance


Exponents are not allowed. Enter all values in a suitable, equal unit of measurement. If you enter all values, e.g. in kOhm, the result is also displayed in kOhm.

For the calculation, enter the values of the individual resistors separated by a semicolon.
Example: 33; 12,1; 22


Resistors in parallel calculator

Enter resistances separated by semicolon
Decimal places
  Result
Total resistance:

Formulas for resistors in parallel


In order to calculate the total resistance of several resistors in parallel, their conductance values are added. The conductance is the reciprocal of the resistance. The formula for three resistors connected in parallel is:

\(\displaystyle \frac{1}{R_{ges}}=\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}\)

If the total resistance of two parallel resistors is to be calculated, the following formula can be used.

\(\displaystyle R_{ges}=\frac{R_1· R_2}{R_1 + R_2}\)


Circuits with resistors

Total resistance of a resistor in parallel
Parallel- total resistance of 2 resistors
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Parallel resistance for an ampere meter
Voltage divider
Loaded voltage divider
Pi Attenuator
T Attenuator


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