# Total Resistance Calculator

This calculator determines the total effective resistance of any number of resistors in series and parallel configurations.

## Series Resistance Calculator

Enter the resistor values separated by commas.

## Series Resistance Formula

Rtotal = R1 + R2 + R3 +…. + Rn

## Example Calculation

If you have two resistors – one large and the other small in parallel, the effective resistance is closer to the larger value. Take for instance 1 Î© and 1000 Î© in series. The effective resistance is 1001 â‰ˆ 1000 Î©.

## Parallel Resistance Calculator

Enter the resistor values separated by commas.

## Parallel Resistance Formula

Rtotal = (1/R1 + 1/R2 + 1/R3 +…. + 1/Rn)-1

## Example Calculation

If you have two resistors – one large and the other small in parallel, the effective resistance is closer to the smaller value. Take for instance 1 Î© and 100 Î© in parallel. The effective resistance is 0.99 â‰ˆ 1 Î©.

## Series and Parallel Resistance Calculator

Enter the series and parallel resistor values in two separate fields separated by commas.

## Series and Parallel Resistance Formula

Rparallel = (1/R1 + 1/R2 + 1/R3 +…. + 1/Rn)-1

Rseries = R1 + R2 + R3 +…. + Rn

Rtotal = Rparallel + Rseries