Series / Parallel Resistance
Combined resistance of any resistor network
📚 Learn more — how it works, FAQ & guide Click to expand
Learn more — how it works, FAQ & guide
Click to expand
Series / parallel resistance calculator
Combined resistance for any resistor network. Add, subtract, or parallel.
How to use this tool
- 1
Pick circuit
Series, parallel, or mixed.
- 2
Add resistors
Comma-separated values in ohms.
- 3
See total
Combined resistance + current + power.
Frequently Asked Questions
Series formula
R_total = R1 + R2 + R3 + ... (sum). Voltage divides proportionally. Current is the same through all.
Parallel formula
1/R_total = 1/R1 + 1/R2 + 1/R3 + ... (reciprocal sum). Current divides. Voltage is the same across all.
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