best way to figure out rental price

[Maquel Russon]

I rent a by the room in a duplex near two big colleges, it has 5 bedrooms on each side. I have used Rentler before to price the rent but it doesn't make sense to use it because if I put that it is a one bedroom the price comes back as a one bedroom apartment. Would pricing as a 5 bedroom and then divide by each rooms square footage make sense?