Resistors In Parallel Calculator
Calculate the equivalent resistance of resistors connected in parallel. Enter up to 10 resistor values and get the total resistance instantly.
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator finds the equivalent resistance of up to 10 resistors connected in parallel.
How to use:
- Enter resistor values in ohms (Ω) into the fields R1 through R10. Use decimal numbers if needed (e.g., 100, 2200, 4700).
- Leave unused fields blank — only fill in the resistors you have.
- Click "Calculate" to see the equivalent resistance.
- Click "Clear" to reset all fields and start over.
What the result means:
- Equivalent Resistance — the total resistance of the parallel network, shown in Ω, kΩ, or MΩ.
- Formula Breakdown — shows the step-by-step calculation: sum of reciprocals and final result.
All values must be positive numbers. Zero or negative values will show an error.
Previous Results
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Frequently Asked Questions
The equivalent resistance Req is given by 1/Req = 1/R1 + 1/R2 + ... + 1/Rn. For two resistors, it simplifies to Req = (R1 * R2) / (R1 + R2).
Yes, you can enter decimal values like 100.5 ohms. The calculator will handle them correctly.
The calculator will show an error message. Resistor values must be positive numbers greater than zero.