Some car jacks can go as high as 20 to 24 inches off the ground. However, a floor jack with a lift capacity of 16 inches is already good enough for you to work comfortably. So, whether to go for 24 or 16 inches is depending on what you’re using it for and your body size. Also, if you intend to work with a mechanics creeper, you might need to lift the vehicle higher than 16 inches.