Parallel Resistance Calculator
Ω
Ω
Ω
Ω
—
Ω
Formula: 1/R_total = 1/R1 + 1/R2 + 1/R3 + ...
Parallel Resistance Calculator
Parallel resistors share the same two nodes, so each has the same voltage across it. The total resistance is always less than the smallest individual resistance.
Conversion Formula
1/R_total = 1/R1 + 1/R2 + 1/R3 + ...
1/R_total = 1/R1 + 1/R2 + 1/R3. The reciprocal of the sum of reciprocals gives the total.
Step-by-Step Examples
R1=100Ω, R2=100Ω = 50Ω
(100×100)/(100+100) = 50
R1=100Ω, R2=200Ω = 66.67Ω
1/(1/100 + 1/200) = 66.67
Frequently Asked Questions
How do you calculate parallel resistance?
Use the reciprocal formula: 1/R_total = 1/R1 + 1/R2 + ... Then take the reciprocal of the sum.
Is parallel resistance always less than the smallest resistor?
Yes, the total resistance of parallel resistors is always less than the smallest individual resistance.
What is the formula for two parallel resistors?
For two resistors: R_total = (R1 × R2) / (R1 + R2).