1994 Gmc Sierra Interior Question

Ok so i know this might be a very stupid question but im not currently at home and wont be for awhile so i need to know .. What is the entire Square feet of a 1994 gmc sierra ext cab 4x4 pickup. I need this information because i am able to pickup some Sound Deadner for a very cheap price and i need the interior specs to make sure i buy alittle more then i would need . I just really need the measurment of the floor and the roof the rest of the cab i can figure out and use up the left overs. So if someone could help me out and give me some answers that would be a very very big help to me.

ThankYou