This voltage divider calculator finds the output voltage of a two-resistor divider using Vout = Vin × R2 / (R1 + R2).
Voltage Divider Calculator
Formula
Vout = Vin × R2 / (R1 + R2)
How to Use This Calculator
- Enter the input voltage Vin.
- Enter the two resistor values R1 and R2.
- Click Calculate to get the output voltage taken across R2.
Worked Example
With Vin = 12 V, R1 = 1000 Ω and R2 = 2000 Ω: Vout = 12 × 2000 / 3000 = 8 V.
Frequently Asked Questions
What is a voltage divider?
A voltage divider is a simple circuit of two resistors in series that produces an output voltage that is a fraction of the input voltage.
What is the voltage divider formula?
Vout = Vin x R2 / (R1 + R2), where the output is taken across R2.
What is a voltage divider used for?
It is used to scale down voltages, set reference voltages, and read sensors such as potentiometers and thermistors.