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Voltage Divider Calculator
Output voltage of a two-resistor voltage divider.
Inputs
Enter your values below.
Result
Your answer appears here.
Enter values and press Calculate — the result appears here.
How it works
The formula behind this calculator.
Vout = Vin × R2 / (R1 + R2)
- Vin
- Input voltage
- R1, R2
- Resistor values
The simplest way to step down a voltage. Only valid when the load draws negligible current — otherwise the load resistance must be in parallel with R2.
Example: Vin 9V, R1 1kΩ, R2 2kΩ → Vout = 9 × 2/3 = 6V
Ref: Kirchhoff's voltage law
Tips
- 💡 Vout = Vin × R2 / (R1 + R2). Only valid when the load draws negligible current.
- 💡 For a real load, the load resistance is in parallel with R2.