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Parallel Resistors Calculator
Resistance of Parallel Connected Resistors Calculator
Formula & Equations for Parallel Resistors Calculator
Finding Total Resistance (RT) when R1 and R2 are given;
1/RT = 1/R1 + 1/R2
RT = R1||R2
RT = R1 x R2 / (R1 + R2)
Finding R1 when RT and R2 given;
R1 = R2× RT / (R2 – RT)
Finding R2 when RT and R1 given;
R2 = R1 × RT / (R1 – RT)
- Related Calculator: Series Resistors Calculator
Parallel Resistors Calculator
Enter any two values and Select Unit then Click on Calculate. Result will display the required Value.
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Do you have a calculator that will find an unknown resistor value needed in a parallel circuit when you don’t have a correct value for one of the resistors to adjust the total needed resistor value?
Example:
I have a needed total value but cannot find a resistor of the correct value
I have a project that needs a total value of 50 ohms, but I have a 100 ohms resistor that is missing
Rt = 50 ohms
I do have a resistor that is 120 ohms (R1)
What unknown resistor (R2) do I need to make the final resistance (Rt) value 50 ohms?
Hi Cliff,
Please check these calculators