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Voltage Divider Calculator
Calculate V-out from V-in using two resistors.
R1
R2
Vin
Vout = ?
GND
OUTPUT VOLTAGE (Vout)
0 V
Split Ratio: 0%
How does it work?
A voltage divider is a simple circuit that turns a large voltage into a smaller one. Using just two series resistors (R1 and R2) and an input voltage (Vin), we can create an output voltage (Vout) that is a fraction of the input.
Formula:
Vout = Vin × ( R2 / (R1 + R2) )Common Uses:
- Reading higher voltage sensors with Arduino/ESP32 (e.g., measuring 12V battery with a 5V pin).
- Creating reference voltages.
- Volume control potentiometers (Audio).