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Parallel Resistance Calculator

Find equivalent resistance for positive ideal resistors in parallel. Zero resistance is excluded to avoid division by zero.

Enter your values

Separate numbers with spaces or semicolons. Use a decimal point.
Example result
Equivalent resistance
66.66666667 Ω

The initial result uses the example values. Enter your own values and calculate again.

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How it works

Find equivalent resistance for positive ideal resistors in parallel. Zero resistance is excluded to avoid division by zero.

1/R = 1/R₁+1/R₂+…

Worked example

Show example inputs and result

Positive resistances in ohms: 100 200.

Equivalent resistance
66.66666667 Ω

Questions and answers

Why are some results rounded?

Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.

Are my inputs sent to a server?

The calculator processes inputs in your browser. Its code does not send your values to a server.

Method reviewed: October 8, 2026 · Methods & accuracy

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