Before purchasing a new black kitchen sink, it is vital that you understand the proper size of the sink cabinet. Oftentimes, you might not have the exact dimensions of your sink, so you need to get a measurement of your current cabinet before making a decision. To get the right size, consider the space below your sink and the size of your cabinets. In order to determine the best black kitchen sink cabinet size, you should measure the space from gable to gable and from the outside edge of your room.