15% over the factory 18% in the rear....originally had 15% on the front windows as well...wasn't dark enough because of the size of our front windshields letting in lots of light; looked like I had 35% on the front...so I put another layer of 15% over the 15% already on the fronts....
Also should note you cant see in during daylight unless your at the right angle...and at night, good luck, cant see in standing next to the window...also have to roll them down to backup lol