In order to determine your rough-in dimension, please measure from the center of your toilet bolt holes to your finished wall. Most of our toilets are manufactured to accommodate a 12" rough-in model toilet. If, however, you find yourself in a situation where you do not have enough space to install your tank onto your bowl because the wall is in the way, the solution is our 10" rough-in toilet. Alternately, if you feel as if your toilet is sitting in the middle of your bathroom because you have a gaping space between the back of your tank and the wall, a 14" rough-in toilet may be a better choice.