Engineering

Series & Parallel Resistor Calculator

Calculate total resistance for resistors in series or parallel.

Series: R = R₁+R₂+R₃ | Parallel: 1/R = 1/R₁+1/R₂+1/R₃

Enter any 2 values to calculate the remaining

Resistor 1 (R₁) (Ohms)

Resistor 2 (R₂) (Ohms)

Resistor 3 (R₃, optional) (Ohms)

Enter values above to calculate

How to Use

This calculator uses the formula Series: R = R₁+R₂+R₃ | Parallel: 1/R = 1/R₁+1/R₂+1/R₃.

Enter any 2 of the 3 values and the calculator will solve for the missing variable automatically.

All calculations run in your browser — nothing is sent to a server.

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