Voltage Divider Calculator
Calculate the output voltage of a resistive voltage divider given the input voltage and two resistor values.
Output Voltage
A voltage divider uses two series resistors to reduce a voltage proportionally.
Vout = Vin × (R2 / (R1 + R2))
Where:
- Vin = input voltage (V)
- R1 = resistor connected to Vin (Ω)
- R2 = resistor connected to ground (Ω)
- Vout = voltage across R2
Key points:
- Output voltage is always less than input voltage
- Works best when the load impedance is ≥ 10× R2
- Power dissipation:
P = Vin² / (R1 + R2)