Parallel resistance calculator

Calculate parallel resistance with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use parallel resistance to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Resistors (Ω)
10,10
Parallel resistance (Ω)
5

Try another scenario

Resistors (Ω)
20,20
Parallel resistance (Ω)
10
Calculation method

Calculation method

Parallel resistance (Ω)

Take the reciprocal of each resistance in a, add those conductances, then take the reciprocal of the sum.

Symbols and units
a
Resistors (Ω)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • Adds conductances, then takes the reciprocal. Lists support up to 1,000 finite values.
Are these inputs private?

These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.

Further reading

Method reference ↗

Background reading; this does not imply endorsement or independent review of SumFizz.

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