What I use for quilt measurements sometimes is this:
Baby size quilt- 42" x 52", Square Baby quilt- 36" to 42" usually works, Lap size- 60" x 72", Crib quilt- 45" x 60", Twin size- 63"x 88", Full Size- 78" x 88", Queen size-84" x 92", King size- 100" x 92".If you are making the quilt for a specific bed you definately need to measure for you specific needs....if you want it to wrap the pillows, how much drop you need, etc.
Hope this helps. Hugs, Drue