sumivo

Parallel Resistor Calculator

Calculate the equivalent resistance of two resistors in parallel.

01 / INPUTS

Ω
Ω

02 / RESULT

EQUIVALENT RESISTANCE

500 Ω

Equivalent resistance
500 Ω

Calculation trace

  1. 1 ÷ (1 ÷ 1,000 Ω + 1 ÷ 1,000 Ω) = 500 Ω
    500 Ω
    Equivalent resistance
§

How it works

For the two entered resistances, the tool computes the equivalent resistance as R = 1 / (1/R1 + 1/R2). Both parallel branches share the same voltage, while their currents add.

Assumptions & limits

  • Calculates exactly two ideal, positive, finite resistances connected in parallel.
  • Does not model resistor tolerance, temperature dependence or parasitic reactance.
§

FAQ

Why is the parallel result lower than either resistor?
Adding a parallel branch increases total conductance, so the reciprocal equivalent resistance is smaller than either positive branch resistance.
§

Related calculators

§

SOURCES