Series & Parallel Resistance Calculator
Calculate total resistance for resistors in series or parallel combinations. Enter multiple values separated by commas.
How It Works
Calculate total resistance for resistors in series or parallel combinations. Enter multiple values separated by commas. Enter your values above and click Calculate to get instant results.
Formula
Series: R_total = R1 + R2 + ... | Parallel: 1/R = 1/R1 + 1/R2 + ...
Quick Examples
- 100Ω + 220Ω + 470Ω series = 790Ω
- 100Ω ∥ 220Ω ∥ 470Ω parallel ≈ 65.2Ω
Frequently Asked Questions
How do I add resistors in series?
Simply add all resistance values: R_total = R1 + R2 + R3 + ...
How do I calculate parallel resistance?
Use the reciprocal formula: 1/R_total = 1/R1 + 1/R2 + 1/R3. The result is always less than the smallest individual resistor.