Question: what are the standard sizes of kitchen units?
Answer: Height- 12, 15, 18, 24, 30, 36, and 42 inches. Wall cabinet heights are typically limited as they must fit between kitchen countertops and ceilings. ... 
12-inch cabinets are those you place above a fridge.
Width- 12-36 inches. ... 
Depth- 12-24 inches.