Current Divider Calculator — Parallel Resistors

Split a known total current among parallel resistors connected across the same pair of nodes. Each branch sees the same voltage, but lower resistance carries a larger share of current. Enter all branch resistances to obtain the equivalent resistance, common voltage and a table of branch current and power.

How to use this tool

1. Enter the total current entering the parallel network.
2. List one resistance for each branch, separated by spaces, commas or new lines.
3. Choose the common resistance unit.
4. Read each branch’s current share and check the common voltage against your circuit.

Formula

Ik = Itotal × (1/Rk)/Σ(1/R); Req = 1/Σ(1/R); V = Itotal × Req

The calculation normalizes branch conductances by the smallest resistance before adding them. This gives the same proportions without forming unnecessarily large reciprocals. Branch power is its current multiplied by the common voltage. All resistances must be positive.

Example

For 3 A entering parallel resistors of 100 Ω and 200 Ω, the equivalent resistance is 66.666667 Ω and both branches have 200 V across them. Their currents are 2 A and 1 A, respectively. The currents add to 3 A; their powers, 400 W and 200 W, add to 600 W.