Resistor network calculator

Series and parallel equivalent resistance, plus a pair finder — what second resistor hits your target value, with the nearest E24.

Pair to hit a target — finds the second resistor

Numbers stay in this browser — nothing is sent anywhere.

Series = straight sum. Parallel = reciprocal sum. The pair finder computes the exact second resistor for a target parallel value (target must be below your resistor), then names the nearest E24 standard value with its error.

How to use

  1. Enter resistor values (Ω, kΩ, MΩ).
  2. Pick series or parallel for the equivalent — or enter one resistor and a target for the pair finder.
  3. Read the equivalent or the second resistor.

What it supports

Series = sum, parallel = reciprocal sum; 1–12 resistors, 0.001 Ω–1 GΩ. The pair finder gives the exact second resistor for a target parallel value (target must be below your resistor), then the nearest E24 standard with its error.

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