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Calculation Formula

Electronic Formulas / Formulae

Resistance in Parallel Formula Calculation

When resistances R1, R2, R3, ... are connected in parallel, the total resistance RP is:

1 / RP = 1 / R1 + 1 / R2 + 1 / R3 + ...

Alternatively, when conductances G1, G2, G3, ... are connected in parallel, the total conductance GP is:

GP = G1 + G2 + G3 + ...

where Gn = 1 / Rn

For two resistances R1 and R2 connected in parallel, the total resistance RP is:

RP = R1R2 / (R1 + R2)

RP = product / sum

The resistance R2 to be connected in parallel with resistance R1 to give a total resistance RP is:

R2 = R1RP / (R1 - RP)

R2 = product / difference

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