Voltage Divider Calculator

A voltage divider circuit is a very common circuit that takes a higher voltage and converts it to a lower one by using a pair of resistors. The formula for calculating the output voltage is based on Ohms Law and is shown below.

Votage Divider Formula: Vout = Vs*R2/(R1+R2)


  • VS is the source voltage, measured in volts (V),
  • R1 is the resistance of the 1st resistor, measured in Ohms (Ω).
  • R2 is the resistance of the 2nd resistor, measured in Ohms (Ω).
  • Vout is the output voltage, measured in volts (V),

Enter any three known values and press "Calculate" to solve for the other.

Volts (V)
Volts (V)
Click "Calculate" to update the field with orange border.