Voltage Divider Calculator Voltage Divider Calculator Enter any three values in Vin, Vout, R1, R2 and leave one field blank to calculate the missing value. Voltage Divider Calculator Input Voltage (Vin): VmV Output Voltage (Vout): VmV Upper Resistor (R1): ΩkΩMΩ Lower Resistor (R2): ΩkΩMΩ Calculate Reset