How to use the current divider calculator
Split current between two parallel branches. Enter total current, resistor 1, resistor 2 in the fields above; the current in r1, current in r2 are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- It — Total current (A)
- R1 — Resistor 1 (Ω)
- R2 — Resistor 2 (Ω)
Worked example
With total current = 2 A, resistor 1 = 100 Ω, resistor 2 = 300 Ω, the calculator gives current in r1 ≈ 1.5 A; current in r2 ≈ 0.5 A.
Frequently asked questions
What is the formula for the current divider calculation?
Current in R1 (A) = It × R2 / (R1+R2). Current in R2 (A) = It × R1 / (R1+R2). Here It is total current (A), R1 is resistor 1 (Ω), R2 is resistor 2 (Ω).
What inputs do I need for the current divider calculator?
You need total current in A, resistor 1 in Ω, resistor 2 in Ω. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.