What the tool does, how to run it, and what to expect from the result.
In parallel, conductances add: 1/R = 1/R₁ + 1/R₂ + … For two resistors that is R₁R₂ ÷ (R₁ + R₂): 100 × 220 ÷ 320 = 68.75 Ω. The result is always smaller than the smallest resistor. In series you simply add them: 320 Ω.
A quick way to understand who this helps, what it solves, and where it connects next.
Students, lab workers, electricians and engineers who want the formula and the answer.
Using the parallel resistor calculator without installing anything or signing up.
Short answers for the questions people usually have before trying a utility like this.
The resistance halves: two 100 Ω resistors give 50 Ω.
To get a value you do not have, or to share power so each resistor runs cooler.
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Enter your numbers and the result updates live in your browser. Nothing is uploaded and no server is used.
Calculations run locally in your browser; nothing is uploaded.