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

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)

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