Voltage Divider Calculator

Calculate output voltage from R1, R2, Vin. Reverse: find R2 for desired Vout. Common resistor values.

Mode

Input Voltage (Vin)

R1 (Ohms)

R2 (Ohms)

  Vin o---[ R1 ]---+---o Vout
                  |
                [ R2 ]
                  |
  GND o-----------+

Vout = Vin x R2 / (R1 + R2)

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