Lift kits are labeled by the amount of lift they give the front of the truck. For instance, most 6 inch lifts will lift the front 6 inches and the rear 3 or 4 so the truck will sit level.
Leveling kits are sold by the amount of lift they give also. A 2.5 inch leveling kit will not actually measure 2.5 inches tall when you pull it out of the box.
2005 Expy, 305/45-22 Falkens on 22x9.5 Eagle 026s.
2011 Jeep Wrangler Unlimited, 2" lift, 33" BFG AT KO's on 17x9 Eagle 197s.
2012 Ram 2500 crewcab diesel. 5" RCX lift, 355/60-20 Nitto Terra Grapplers on 20x9 KMC XD Spys.