Series and Parallel Resistor Calculator
Total resistance of resistors in series and in parallel.
Ω
How it works
In series the values add: R = R₁ + R₂ + … In parallel the reciprocals add: 1/R = 1/R₁ + 1/R₂ + … Parallel resistance is always smaller than the smallest resistor. Enter values separated by commas or spaces. Example: with the default values, series resistance comes to 650 Ω.
FAQ
Is this calculator free?
Yes. No signup is needed and nothing you enter is stored.
Is the result exact?
Results are rounded for display. For financial, medical, or legal decisions, confirm with a professional.
Do my numbers leave my device?
No. The calculation runs in your browser.