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Resistor Network Calculator
Combine resistors in series, parallel, or a custom mix.
Inputs
Enter your values below.
Result
Your answer appears here.
Enter values and press Calculate — the result appears here.
How it works
The formula behind this calculator.
Series: R = Σ Rᵢ; Parallel: 1/R = Σ 1/Rᵢ
- Rᵢ
- Individual resistors
Series resistances add. Parallel resistances add as reciprocals. Two equal resistors in parallel = half the value.
Example: Two 100 Ω in series: 200 Ω; in parallel: 50 Ω
Ref: Kirchhoff's laws
Tips
- 💡 Series: Rtotal = R1 + R2 + ... Parallel: 1/Rtotal = 1/R1 + 1/R2 + ...
- 💡 Two equal resistors in parallel = half the value. Three = one-third.