Voltage Divider Calculator
Calculate the output voltage of a resistor voltage divider network. Enter the input voltage and two resistor values.
V
Ω
Ω
Output voltage (Vout)
6.000 V
Current through divider
0.600 mA
Voltage divider formula
A voltage divider produces an output voltage that is a fraction of the input voltage. The formula is:
Vout = Vin × R2 / (R1 + R2)
R1 is connected between the input voltage and the output, and R2 is connected between the output and ground.
When to use a voltage divider
Voltage dividers are commonly used for reading sensor values with a microcontroller, biasing transistors, setting reference voltages, and level shifting between different voltage circuits. They are not suitable for powering loads that draw significant current, as the output voltage drops under load.