Electronics
Series & parallel resistors
Equivalent resistance of several resistors in series or parallel.
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Compute equivalent resistance
Enter the values in ohms separated by commas, choose series or parallel: the result appears.
Example (100, 220, 330 Ω)
| Configuration | Equivalent resistance |
|---|---|
| Series | 650 Ω |
| Parallel | ≈ 56.9 Ω |
Exact calculation. 100% local.
Frequently asked questions
Which formula in series?
Resistances add up: R = R₁ + R₂ + … The total is always larger than the largest one.
Which formula in parallel?
1/R = 1/R₁ + 1/R₂ + … The total is always smaller than the smallest one.
How many resistors?
As many as you like: separate the values with commas (e.g. 100, 220, 330).