Electronics
Current Divider Calculator
Figure out how total current divides between parallel branches without working through algebra each time.
current dividerparallel circuitresistance
Current Divider
Split total current among parallel resistive branches.
R1 current & power
1.5 A · 495 W
R2 current & power
1 A · 330 W
Total current
2.5 A
Current divider rule
I₁ = I_total × (R_total / R₁) where R_total = (R₁ × R₂) / (R₁ + R₂)
For two-branch dividers the current through one resistor equals total current multiplied by the ratio of the opposite resistance over the sum.
How to use
- Enter the total supply current.
- Provide the resistances of each branch (add a third branch if required).
- Review individual branch currents and verify they sum back to the source.
Example
Input: Itotal = 2.5 A, R1 = 220 Ω, R2 = 330 Ω
Output: I₁ ≈ 1.5 A, I₂ ≈ 1.0 A
FAQ & notes
Can I add more than two branches?
Yes—toggle the third branch option to include a third resistor. For more branches duplicate the pattern in your own spreadsheet.
Is power dissipation shown?
Each branch lists wattage so you can confirm resistor ratings before soldering.