With the lift spacers, and tires, everything on the vehicle raises, relative to vehicle height. As LokiWolf stated above, the spacers or leveling kits, etc (all basically do the same thing..) just raise the height of the vehicle by manipulating the space between the top of the strut/spring and the vehicle's frame. Factor in a set of taller tires and that aggregate is your lift.
Example, if you put a 3"/2" (that's 3 inches front, 2 in the rear) kit on, it will raise the front 3 inches, and the rear 2 inches, leveling it out. These all by and large sit a bit higher in the front, hence the "leveling" moniker.
Say you have a 3/2 kit, plus tires that are 2.5, 3 inches taller than stock, you've effectively gained 5-6 inches of clearance over stock. This may be approximate, due to spring sag, etc.
Even though we all know springs don't sag or settle. *insert rolling eyes*
I am running a Readylift 3/2 setup with 295/70/18, and while I don't know that tire's size in inches, it's a good bit taller than stock. Before I could get in/out without needing the running board...now, I need it to step up onto. And I'm 6' and in excellent physical shape, so.....
Your mileage may vary, pun intended.
The top of the hood is right at chest level on me. The top of the mirror is chin level, if that helps give a rough idea. These tires are a bit too much, they rub at full lock. I also have 1.5" wheel spacers. I'm going to change wheels soon with different offset and ditch the wheel spacers. Unless I can find a set of the '21 F150 wheels I want..