`R = (1/R_1+1/R_2)^(-1)`

Enter a value for all fields

The Resistance of Resistors in Parallel calculator computes the resistance produced by two resistors in parallel.

INSTRUCTIONS: Choose units and enter the following:

• (R₁) Resistor 1
• (R₂) Resistor 2

Resistance in Parallel (R): The calculator returns the resistance in Ohms (Ω).  However, this can be automatically converted to compatible units.

The Math / Science

The formula for equivalent Resistance of 2 Resistors in Parallel is:

`R=(1/R_1+1/R_2)^(−1)`

where:

• R = Total Resistance of two resistors in parallel 
• R₁ = Resistance from Resistor 1
• R₂ = Resistance from Resistor 2

References

21.8 Series and parallel circuits by Benjamin Crowell, Light and Matter  licensed under the Creative Commons Attribution-ShareAlike license.