Current Divider Calculator

Current Divider Calculator supports engineering calculations with transparent assumptions, practical result interpretation, and links to next-step technical resources.

Set total input current and branch resistances to solve branch current split.

Current Split Visualization

Formula

Ii = Itotal × (Gi / ΣG)

Gi = 1 / Ri

Req = 1 / Σ(1 / Ri)

For two branches, I1 = Itotal × R2 / (R1 + R2) and I2 = Itotal × R1 / (R1 + R2).

Parallel Branch Circuit

Branch Current Distribution

Enter total current and all branch resistances to render split profile.

Inputs & Outputs

Total Input Current (Itotal)

Branch Resistance R1

Branch Resistance R2

Output

Equivalent Resistance

Required Source Voltage

Total Power

Dominant Branch

Current Divider Fundamentals

In parallel branches, voltage is common and current splits by conductance. Branches with lower resistance carry proportionally higher current.

Core Relationship

Ii = Itotal × (Gi / ΣG)

Gi = 1 / Ri

Multi-branch split is governed by relative conductance.

Two-Branch Shortcut

I1 = Itotal × R2 / (R1 + R2)

I2 = Itotal × R1 / (R1 + R2)

Current ratio is inverse to resistance ratio.

Two-Branch Quick Reference

Use ratio intuition for quick branch current estimates during circuit review.

Resistance Relationship	Current Split	Engineering Note
R1 = R2	I1 = 50%, I2 = 50%	Equal branches share current equally.
R1 = 2 × R2	I1 = 33.3%, I2 = 66.7%	Lower resistance branch carries more current.
R1 = 4 × R2	I1 = 20%, I2 = 80%	Branch current split is inverse to resistance ratio.
R1 = 9 × R2	I1 = 10%, I2 = 90%	Dominant current flows in the smallest resistance branch.

Design Selection Matrix

Pair branch split analysis with tolerance and thermal constraints for robust design.

Scenario	Objective	Recommendation	Critical Checks
Parallel sensing network	Predict branch current stress and sensor loading	Use accurate resistance values and include tolerance sweep for branch extremes.	Power per branch, thermal rise, measurement accuracy
Current-sharing resistor bank	Distribute total current across multiple paths	Match resistor tolerance and thermal coupling to reduce imbalance.	Hotspot branch, derating margin, drift with temperature
Protection and shunt bypass paths	Control bypass current split under fault or transient conditions	Model both nominal and worst-case resistance drift values.	Peak branch current, fuse trip timing, transient power