The full-sized iPad is 9.5 inches tall and 7.3 inches wide with a 9.7 inch screen measured diagonally. The iPad is very thin, measuring .37 inches in depth, and weighs only 1.44 pounds, with the 4G/3G model weighing slightly more than the Wi-Fi only model, though you wouldn't be able to tell the difference without a scale.
The original iPad is the same height and width as the newest model, but at 1/2 inch in depth, it is slightly thicker. It weighs 1.5 pounds.
The iPad Mini
The iPad Mini is 7.9 inches tall, 5.3 inches wide and has a depth of .28 inches, which is 23% thinner than the full-sized iPad. It has a 7.9 inch display, measured diagonally, amounting to 35% more real estate on the screen than a standard 7-inch tablet. The iPad Mini weights only 0.68 pounds, which is 53% lighter than the iPad 4.