Parallel Resistor Calculator

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Total mode combines a list of resistors. Reverse mode finds the missing resistor to add in parallel.
Enter two or more positive resistor values separated by commas. The unit below applies to every value.
Applied to every value in the list and to the target and known resistors below.
Add the voltage across the combination to also see total current and dissipated power. Leave at 0 to skip.
V
Equivalent resistanceEquivalent resistance 56.8966 Ω
56.8966Ω
Total conductance0.017576S
Resistors counted3
Smallest branch100Ω
Smallest single branch100
Parallel total56.8966

3 resistors in parallel give 56.8966 Ω.

  • In parallel the reciprocals add: 1/R = 1/R₁ + 1/R₂ + …, so you sum conductances, not resistances.
  • The result (56.8966 Ω) is always less than the smallest branch (100 Ω) because adding a path can only increase total current flow.
  • Identical resistors are a shortcut: n equal resistors of R ohms combine to R/n.

Next stepWire these same resistors in series instead and the values simply add up to a larger total.

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