Most upper kitchen cabinets come with two shelves, placed equal distances apart. When I’m setting up a kitchen, the first thing I do is remove the shelves from the cabinets. Then I start at the bottom, placing items where I want them. I install the next shelf as low as possible, leaving enough room to remove items with ease.
Generally, there’s a lot of room at the top of the cabinet for another shelf. I buy shelving and the little shelf hooks at my local home improvement store. I’ve been pleasantly surprised at the additional space I’ve created in my cabinets. Sandi