How many square feet is the interior?

[Skunksmash]

For all you guys who have done your interior in dynamat (or any sound deadener), how many square feet did it end up taking? Just to do the firewall, floor, and rear of the cab up to the glass though. I want to go ahead and leave out the doors and roof at this point. That is going to have to come later on due to budgetary limitations. But I have the carpet out now, and I need to know how many square feet of the sound deadener to buy. Again that's just for the firewall, the floor, and all the way up the back of the cab, to the glass.

[eventhorizon66]

http://www.73-87.com/7387garage/interior/sound_deadening.htm