iPhone 18 Pro vs iPhone 17 Pro: Size Comparison

Quick answer: The iPhone 18 Pro and 17 Pro share the same footprint — 150.0 × 71.9 × 8.75 mm with a 6.3-inch display. The 18 Pro weighs 211 g vs 206 g on the 17 Pro. Cases should transfer; the upgrade is chip, camera, battery, and price, not size.

Apple kept the 18 Pro body identical to the 17 Pro. If you are deciding between the two, size and case fit are not the deciding factors — specs and cost are.

Updated September 10, 2026 · Dimensions from Apple.com iPhone 18 Pro specs

Full dimensions — iPhone 18 Pro vs 17 Pro

Dimension	iPhone 18 Pro	iPhone 17 Pro	Difference
Height	150.0 mm	150.0 mm	Same
Width	71.9 mm	71.9 mm	Same
Thickness	8.75 mm	8.75 mm	Same
Weight	211 g	206 g	+5 g
Screen size	6.3"	6.3"	Same

Source: Apple.com iPhone 18 Pro specs

What the numbers mean

Will you feel the 5 g weight difference?

Probably not in daily use. Five grams is less than the weight of a standard paperclip. The phones feel the same in hand because height, width, and thickness are identical.

Case compatibility

iPhone 17 Pro cases should fit the 18 Pro. Same external dimensions. Tight camera-bump cutouts may vary by manufacturer — check the listing if you use a precision-fit case.

What actually changed

A20 Pro chip, variable-aperture main camera, 36-hour vs 33-hour rated battery, 60W-capable charging, 2TB storage tier, and a higher launch price. See the full iPhone 17 Pro vs 18 Pro comparison for every spec.

Size is a tie

Want the full upgrade verdict?

Chip, camera, battery, charging, and price — not millimeters — decide this upgrade. Our complete comparison scores every category.

iPhone 17 Pro vs 18 Pro: full comparison →