Voltage Divider Calculator

One of the most basic and common circuits is the two resistor voltage divider. The ratio of the resistors divides and input voltage down to a lower voltage. This calculator simplifies the task.

Voltage Divider Circuit Schematic

Inputs:
Input Voltage:	(V)
Results:
Output Voltage: (V)	Ratio (R1/R2):
Fill in one of the parameters below and the other two will be computed.
R1	(KOhms)
R2	(KOhms)
R1+R2	(KOhms)

See our standard resistor calculator for a real world resistor value.

Equations:

Vo= Vin*R2/(R1+R2)

R2/R1= Vo/(Vin-Vo)