Resistance Calculator

Series Resistors

R₁ (Ω)

R₂ (Ω)

R₃ (Ω) - optional

R₄ (Ω) - optional

Parallel Resistors

R₁ (Ω)

R₂ (Ω)

R₃ (Ω) - optional

R₄ (Ω) - optional

Formula

Series: R = R₁+R₂+... | Parallel: 1/R = 1/R₁+1/R₂+...

Frequently Asked Questions

How do I calculate total resistance?

Series: R_total = R₁ + R₂ + R₃ + ... (add them up). Parallel: 1/R_total = 1/R₁ + 1/R₂ + 1/R₃ + ... (reciprocal of sum of reciprocals). For two resistors in parallel: R = (R₁ × R₂) / (R₁ + R₂).

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