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Resistors in Parallel Calculator - Online Multiple Branch Tool

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Resistors in Parallel Calculator

Calculate equivalent resistance for multiple parallel branches, plus optional current and power distribution.

Enter values in Ω, kΩ, or MΩ. Minimum 2 branches.
V
Optional: enter total voltage to see branch currents and powers.
Results

Equivalent Resistance:

--

Total Current:

Total Power:

Branch Resistance Current Power

Frequently Asked Questions

In a parallel circuit, each resistor provides an additional path for current. More paths lower the total resistance to current flow. Mathematically, 1/Req = 1/R1 + 1/R2 + ..., so Req is always less than the smallest R.

If a resistor in parallel opens (infinite resistance), it no longer conducts current. The equivalent resistance increases slightly because one path is removed, but the circuit continues to function through the remaining resistors.

Yes! This calculator automatically converts all resistance values to Ohms before computing the equivalent. You can freely mix Ω, kΩ, and MΩ in different branches.

Each additional parallel branch increases total current (for a fixed voltage). Total power (P = V × I) increases, but individual branch power depends on that branch's resistance. Use the voltage input feature to see branch-level power.
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