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Instant result
Enter the data and press the button to do the calculation.
Online Calculator
Series and parallel resistance calculator
Enter several resistances in ohms to find the equivalent resistance in both configurations.
Example: 100 220 330
Information
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Local processing
The values are processed directly in your browser.
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Free
No registration, external API or subscription required.
Frequently asked questions
How do you add resistances in series?
Add them directly: R = R₁ + R₂ + ...
How are they calculated in parallel?
1/R = 1/R₁ + 1/R₂ + ...
Is the equivalent resistance in parallel lower?
Yes. With positive resistances, it is lower than the smallest individual resistance.
Does it support decimals?
Yes.