Voltage divider

The below given calculator is a voltage divider calculator. It is in the form of a table. Now in a single column there is only one cell for the unknown value. We need in total 4 values, of which we feed 3 values ( in red cells ) and get the fourth one.

Unknown	Vout	R2	R1	Vin
Vin					V
R1					Ohm
R2					Ohm
Vout					V