sounds like you are asking about the sizes of the three components when making the quilting sandwich. Normally, the batting is larger than the top and the backing is larger than the batting. If you are leaving the amounts you mention on all 4 sides, it would be generous. If the quilt will be quilted by a long armer, you need to check with them about the required excess. I usually stitch 1/4" from the edge all around the quilt. I find this makes it easier to apply the binding.