[header] How to build kitchen cabinets [title] Design your cabinets. [step] Cabinets are usually about 24 " deep to allow for a roughly 25 " deep countertop with a slight lip. Cabinets are also usually 34.5 " tall, allowing for a 36 " overall height once the countertop material is added. 
To calculate the size of wall (or upper) cabinets, add 18-20 " to the counter height. Subtract this from the overall height of your ceiling and you will have the range you can work in for cabinet size.