Parallel Resistance Calculator
Calculate total resistance of resistors connected in parallel. Uses the reciprocal formula 1/R_total = 1/R₁ + 1/R₂ + ...
Enter resistor values.
Parallel Resistance Formula
1/R_total = 1/R₁ + 1/R₂ + 1/R₃ + ...
For 2 resistors: R_total = (R₁ × R₂) / (R₁ + R₂)
For 2 resistors: R_total = (R₁ × R₂) / (R₁ + R₂)
In parallel, voltage is the same across all resistors. Current divides between them. Total resistance is always less than the smallest individual resistor.
Example: 100 Ω and 200 Ω in parallel.
R = (100 × 200) / (100 + 200) = 20000/300 = 66.67 Ω
R = (100 × 200) / (100 + 200) = 20000/300 = 66.67 Ω
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Last updated: 2026-08-08