It's hard to know how much junk you have when you call to get a quote.  One way to get a general idea is to measure the pile.  Below are the dimensions for the trailer that is used to remove the trash and debris. 

Full-Trailer Load:

A load that is up to sixteen feet in length by six

feet in width and is up to four to six feet tall.

A full trailer load is the same size as A

15 yard roll-off container.

Three-Quarter Trailer Load: 

A load that is up to twelve feet in length by six

feet in width and is up to four to six feet tall.

Half-Trailer Load: 

A load that is up to eight feet in length by six feet

in width and is up to four to six feet tall.

One-Quarter Trailer Load: 

A load that is up to four feet in length by six

feet in width and is up to four to six feet tall. 

After You Have Measured Your Pile... 

A pile that is up to 8 feet long, 6 foot wide, and 4 to 6 feet tall (depending on type of objects) would typically fit in a half-trailer load. 

A pile that is up to 16 feet long, 6 foot wide, and 4 to 6 feet tall would typically fit in a full-trailer load.

Concrete and bricks can only be piled 1 to 2 feet high because of the weight.

All junk that is being removed does not have to be in one area.  We can gather it up all throughout the house and backyard, it does not have to be by the curb.