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For casings, 50 percent is good. Generally, vertical trim elements such as door and window casings should be smaller and have less heft than baseboards. So I've found that a good rule of thumb for sizing window and door casings is to keep them at about 50 percent of the height of the baseboard.
As always, this isn't a hard and fast rule. Casings that equal the dimensions of the baseboards certainly can work quite well.
Another guideline for crown selection is to use the same crown throughout the kitchen if your design calls for using a crown at the top of your cabinets. In fact, you'll probably want the crown to be finished and supplied by the cabinetmaker. Otherwise, the crown won't match, making transitions from one to the other problematic.
All together now. A well-trimmed room is something special. Its baseboard, casings and crown all relate to each other in their style, proportions, sizing and finish. In this example, the baseboard appears to follow the 7 percent guideline: The casings are about half the size of the baseboard, and the crown looks to be just slightly smaller than the baseboard. There's no doubt that the trim for this room was conceived as part of the overall design.