The iPad mini is 7.9 inches tall, 5.3 inches wide, and 0.28 inch thick. For comparison, note that the new fourth-generation iPad measures 9.5 by 7.3 by 0.37 inches. The iPad minis volume is less than half of the big ones. Obviously, the iPad mini is lighter, too, weighing 312 grams (11.0 ounces) versus 662 grams (23.4 ounces). For the sake of further comparison, Googles is roughly 7.8 by 4.7 by 0.4 inches and weighs 340 grams (12.0 ounces), so the iPad mini is a bit smaller.
The iPad minis screen is 7.9 inches on the diagonal, compared with 9.7 inches for the full-size iPad. Although its smaller than the regular iPads display, its diagonal measurement is twice that of the iPod touch (4 inches).