A box of Powdered Sugar is: 1 pound (1 box) of confectioners sugar is equivalent
http://www.chacha.com/question/howcupsinaboxo...

Depends on the size of the box.
http://wiki.answers.com/Q/How_many_cups_is_half_a_...

1. Multiply the number of pounds of sugar the recipe calls for by 3.75 to find out how many cups of sifted powdered sugar you need. 2. Set the appropriate measuring cup in a large
http://www.ehow.com/how_8182644_substitutecupspo...

A 1 pound box of powdered sugar contains 3 1/2 cups. It takes only 2 cups of granulated sugar to make 1 pound.
http://www.kgbanswers.com/howmanycupsisinabo...
