Calculate
Formula and method
Series: Rtotal = ΣRi. Parallel: Rtotal = 1 / Σ(1/Ri). Values are converted to ohms before arithmetic. Zero and negative resistances are rejected.
Worked example
100 Ω + 220 Ω + 330 Ω in series gives 650 Ω. In parallel, 100 Ω and 200 Ω give approximately 66.6667 Ω.
Limits and safety
Ideal equivalent resistance only. Real components have tolerances, temperature behavior, and power limits. Check circuit and component requirements separately.
Privacy
The calculation runs locally. Entered circuit values are not submitted to a server or included in analytics events.