Series & Parallel Resistor Calculator
Add up to 10 resistors and calculate the equivalent resistance for series or parallel circuits.
Choose series or parallel mode, enter resistor values, and view the equivalent resistance.
Series and parallel resistors
In series, resistances add: Req = R1 + R2 + … + Rn. In parallel, reciprocals add: 1/Req = 1/R1 + 1/R2 + … + 1/Rn. Series circuits share the same current; parallel circuits share the same voltage across each branch.
