Electronics
Current Divider Calculator
Figure out how total current divides between parallel branches without working through algebra each time.
Split total current among parallel resistive branches.
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
Student-friendly breakdown
This walkthrough emphasizes the most searched ideas for Current Divider Calculator: current divider calculator, parallel resistor current calculator, current split calculator, current divider formula calculator. Start with the formula above, then follow the guided steps to double-check your work. For quick revision, highlight the givens, plug into the equation, and finish by verifying your units.
Need more support? Use the links below to open the long-form guide, browse additional examples, or hop into adjacent calculators within the same topic — each one is a quick way to double-check your work or handle a related question without starting from scratch.
Deep dive & study plan
Current Divider Calculator: Splits current through resistors in a parallel branch. It's built around current divider, parallel circuit, resistance, so you can go from a raw question to a checked answer without switching tools.
The math behind it: For two-branch dividers the current through one resistor equals total current multiplied by the ratio of the opposite resistance over the sum. The core relationship is I₁ = I_total × (R_total / R₁) where R_total = (R₁ × R₂) / (R₁ + R₂), shown above the calculator so you can see exactly how your inputs turn into the result.
To use it well: (1) Enter the total supply current. (2) Provide the resistances of each branch (add a third branch if required). (3) Review individual branch currents and verify they sum back to the source. Keep your units consistent as you go, and re-run a case you already know the answer to — it's the fastest way to catch a typo before it throws off a result you're relying on.
Worked example: entering Itotal = 2.5 A, R1 = 220 Ω, R2 = 330 Ω returns I₁ ≈ 1.5 A, I₂ ≈ 1.0 A. Try swapping in your own numbers next, especially a case you're unsure about, before you use this for something that matters.
Quick retention checklist
- Speak the formula aloud (or annotate it) so the relationships stick.
- Write each step in your own words and compare with the numbered list above.
- Swap in new numbers for the Example to make sure the calculator (and your logic) handles edge cases.
- Check at least one related calculator below — it's the fastest way to confirm your numbers still line up from a different angle.
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.
What formula does the Current Divider Calculator use?
For two-branch dividers the current through one resistor equals total current multiplied by the ratio of the opposite resistance over the sum.
How do I use the Current Divider Calculator?
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.