Are the iPhone 7 Plus and 8 Plus the Same Size?
Although the iPhone 7 Plus and iPhone 8 Plus are extremely similar in size the iPhone 8 Plus is just slightly larger and significantly heavier.
The Dimensions are as follows:
iPhone 8 Plus - 158.4 x 78.1 x 7.5 mm (6.28 x 3.07 x 0.32 in) (HxWxD) and 202g (7.13 oz)
iPhone 7 Plus - 158.2 x 77.9 x 7.3 mm (6.23 x 3.07 x 0.29 in) (HxWxD) and 188g (6.63 oz)
The glass back on the iPhone 8 contributes to the heavier weight but also supports wireless charging.