iPhone 18 Pro & Pro Max Size: Dimensions, Weight & Screen Compared
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iPhone 18 Pro & Pro Max Size: Dimensions, Weight & Screen Compared
If you're trying to work out the iPhone 18 size before you buy, here's the short version: the iPhone 18 Pro measures 150.0 x 71.9 x 8.75 mm with a 6.3-inch screen, and the iPhone 18 Pro Max measures 163.4 x 78.0 x 8.75 mm with a 6.9-inch screen. Both bodies are exactly the same size as last year's iPhone 17 Pro and 17 Pro Max. What did change is weight: the 18 Pro weighs 7.44 oz (211 g) and the 18 Pro Max weighs 8.78 oz (249 g), which makes the Pro Max the heaviest slab iPhone Apple has ever made.
Below we compare every dimension, put the 18 Pro and Pro Max next to the iPhone Duo and last year's models, and explain what the size and weight mean for one-handed use, pockets and drop protection.
iPhone 18 Size at a Glance
| iPhone 18 Pro | iPhone 18 Pro Max | iPhone Duo (folded) | |
|---|---|---|---|
| Height | 150.0 mm (5.91 in) | 163.4 mm (6.43 in) | 117.8 mm (4.64 in) |
| Width | 71.9 mm (2.83 in) | 78.0 mm (3.07 in) | 84.1 mm (3.31 in) |
| Depth | 8.75 mm (0.34 in) | 8.75 mm (0.34 in) | 11.3 mm (0.44 in) |
| Weight | 7.44 oz (211 g) | 8.78 oz (249 g) | 8.96 oz (254 g) |
| Screen size | 6.3 inches | 6.9 inches | 5.4" cover / 7.6" inner |
| Starting price | $1,199 | $1,299 | $1,999 |
Unfolded, the iPhone Duo measures 117.8 x 164.6 x 5.2 mm, which makes it the thinnest iPhone Apple has ever built when open. Closed, it's the thickest iPhone in well over a decade.
iPhone 18 Pro Size: Dimensions and Screen
The iPhone 18 Pro is the compact option in the Pro lineup. At 150.0 mm tall and 71.9 mm wide, it's roughly the footprint of a standard playing card stretched slightly taller, and most people can reach the top of the screen with one thumb without shuffling the phone in their hand.
The 6.3-inch ProMotion display is the same size as the 17 Pro's. The visible difference up front is a smaller Dynamic Island, which frees up a little more usable screen at the top without changing the physical panel size.
At 7.44 oz (211 g), the 18 Pro is about a quarter-ounce heavier than the 17 Pro (7.19 oz / 204 g). That's not something most people notice in the hand, but if you're coming from an older, lighter model like an iPhone 13 Pro or 14 Pro, it will feel denser.
Who it suits: anyone who wants Pro cameras and performance in a phone that fits a front jeans pocket and works comfortably one-handed.
iPhone 18 Pro Max Size: Dimensions and Screen
The iPhone 18 Pro Max is 163.4 mm tall and 78.0 mm wide, with a 6.9-inch ProMotion display. That's 13.4 mm taller and 6.1 mm wider than the 18 Pro. In practice, the width is what you feel most: the extra 6 mm is the difference between wrapping your hand around the phone and stretching to reach across it.
The big story is weight. At 8.78 oz (249 g), the 18 Pro Max is more than half an ounce heavier than the 17 Pro Max (8.22 oz / 233 g), even though the outside dimensions are identical. Apple filled the same shell with a larger battery, a bigger vapor chamber and new internals, and it shows on the scale. The payoff is up to 45 hours of rated video playback, the longest of any iPhone.
Who it suits: heavy video watchers, gamers, people who want the longest battery life, and anyone who uses their phone more than their laptop. If you have smaller hands or mostly use your phone one-handed on the move, try one in a store before you commit.
iPhone 18 Pro vs Pro Max: Size Difference Explained
| iPhone 18 Pro | iPhone 18 Pro Max | Difference | |
|---|---|---|---|
| Height | 150.0 mm | 163.4 mm | +13.4 mm |
| Width | 71.9 mm | 78.0 mm | +6.1 mm |
| Depth | 8.75 mm | 8.75 mm | Same |
| Weight | 7.44 oz (211 g) | 8.78 oz (249 g) | +1.34 oz (+38 g) |
| Screen | 6.3" | 6.9" | +0.6" |
Same thickness, same button layout, same full-width camera plateau, same colors (black, silver, glacier and burgundy). The choice really comes down to two things: how much screen you want, and how much weight you're happy to carry. The Pro Max is $100 more at every storage tier; see our iPhone 18 price guide for the full breakdown.
Is the iPhone 18 Bigger Than the iPhone 17?
No. Before the September 9, 2026 Apple event, supply-chain reports claimed the 18 Pro would be thicker to fit a bigger battery. That rumor turned out to be wrong. The iPhone 18 Pro and Pro Max share their exact height, width and depth with the 17 Pro and 17 Pro Max:
| 17 Pro | 18 Pro | 17 Pro Max | 18 Pro Max | |
|---|---|---|---|---|
| Dimensions | 150.0 x 71.9 x 8.75 mm | 150.0 x 71.9 x 8.75 mm | 163.4 x 78.0 x 8.75 mm | 163.4 x 78.0 x 8.75 mm |
| Weight | 7.19 oz (204 g) | 7.44 oz (211 g) | 8.22 oz (233 g) | 8.78 oz (249 g) |
| Screen | 6.3" | 6.3" | 6.9" | 6.9" |
So the phones aren't bigger, they're heavier. That has one handy side effect: most iPhone 17 Pro cases physically fit the 18 Pro. There are a few caveats around tight camera cutouts and button feel, which we cover in will your iPhone 17 case fit the iPhone 18? For everything else that changed between generations, see iPhone 18 Pro vs iPhone 17 Pro and iPhone 18 Pro Max vs 17 Pro Max.
iPhone Duo Size: Where the Foldable Fits In
Apple's first foldable is officially called the iPhone Duo. Folded, it's 117.8 x 84.1 x 11.3 mm, which makes it much shorter than the 18 Pro but wider and noticeably thicker. Open it and you get a 7.6-inch inner screen on a body just 5.2 mm thin, with a 5.4-inch cover screen on the outside for quick tasks.
At 8.96 oz (254 g), the Duo is slightly heavier than even the 18 Pro Max. It's the right size if you want a small phone in your pocket and a near-tablet in your hands, but it's not a lightweight device. It pre-orders October 16 and ships October 23, starting at $1,999. Our iPhone Duo cases guide explains how to protect the hinge and both screens.
Standard iPhone 18 Size: What We Know
Apple hasn't announced a standard iPhone 18 yet. The base iPhone 18, an iPhone 18e and a second-generation iPhone Air are reported to be coming in spring 2027, but there are no official dimensions or screen sizes. Treat any "iPhone 18 size" figures for those models as rumors until Apple confirms them. Our iPhone 18 release date guide tracks the latest.
Why Weight Matters More Than Size This Year
A heavier phone hits the ground harder. Drop an 8.78 oz Pro Max from pocket height and it carries noticeably more energy into the impact than a lighter phone dropped from the same height. Combine that with a large, flat back of glass and a camera plateau that sticks out, and the Pro Max is the iPhone that most needs real protection.
Weight also changes how you handle the phone. The heavier the phone, the more likely it is to slip during one-handed use, especially while texting on the move. A case with a bit of grip on the sides does more for drop prevention than most people realize.
Best Cases for the iPhone 18 Pro and Pro Max Size
Because the 18 Pro and Pro Max keep the same outside dimensions, the case question is about protection and bulk rather than fit. Here's how the main options compare.
1. Dropguys Ultimate (Best Overall)
The Dropguys Ultimate case is built for the iPhone 18 Pro and Pro Max, with shock-absorbing corners, raised edges around the screen and camera plateau, and grippy sides that make a heavy phone easier to hold. It adds protection without turning the Pro Max into a brick. It's also the only case on this list with a 100% money-back guarantee: if your phone breaks in the case, you get your money back.
2. Dropguys Ultra Slim Clear (Best Slim + MagSafe)
If you'd rather keep your phone as close to its original size as possible, the Dropguys Ultra Slim Clear adds very little thickness, shows off glacier, burgundy, silver or black through the back, and has a built-in MagSafe ring. It's available for the 18 Pro, 18 Pro Max and iPhone Duo, and it carries the same money-back guarantee.
3. OtterBox (~$60)
Tough and well-known, but bulky. On a phone that already weighs 8.78 oz, OtterBox's thicker designs make the Pro Max feel big in the pocket. No guarantee if your phone breaks.
4. Casetify (~$65)
Great designs and plenty of customization, but expensive for the protection you get, and no guarantee if the phone breaks.
5. Apple MagSafe Case (~$49)
A precise official fit and clean MagSafe performance, but limited drop protection for the price. No guarantee.
6. Spigen (~$20)
A solid budget pick with decent protection, but no guarantee if your phone breaks.
Browse every option in our iPhone 18 cases collection, or see our full rankings in best iPhone 18 Pro cases and best iPhone 18 Pro Max cases.
Don't forget the screen and camera
A bigger screen is a bigger target. A Dropguys iPhone 18 screen protector covers the 6.3" or 6.9" glass, and the iPhone 18 camera lens protector guards the plateau that touches the table first when you set the phone down. If you want to carry cards without a bulky wallet case, the Dropguys MagSafe Wallet snaps onto any MagSafe case.
Which iPhone 18 Size Should You Buy?
- Get the iPhone 18 Pro if you want one-handed comfort, a phone that disappears into a pocket, and Pro features at $1,199.
- Get the iPhone 18 Pro Max if battery life and screen size matter most and you don't mind carrying 8.78 oz.
- Get the iPhone Duo if you want a compact phone that opens into a 7.6-inch tablet and you're comfortable paying $1,999+ for a first-generation foldable.
Whichever size you choose, protect it from day one. Shop the Dropguys iPhone 18 collection, backed by our 100% money-back guarantee if your phone breaks in our case.
iPhone 18 Size FAQ
What is the screen size of the iPhone 18 Pro and Pro Max?
The iPhone 18 Pro has a 6.3-inch display and the iPhone 18 Pro Max has a 6.9-inch display. Both are ProMotion OLED screens and are the same sizes as the iPhone 17 Pro and 17 Pro Max.
Is the iPhone 18 Pro Max bigger than the 17 Pro Max?
No. Both measure 163.4 x 78.0 x 8.75 mm. The iPhone 18 Pro Max is heavier, though: 8.78 oz (249 g) versus 8.22 oz (233 g).
How much does the iPhone 18 Pro Max weigh?
The iPhone 18 Pro Max weighs 8.78 oz (249 g), making it the heaviest non-folding iPhone Apple has made. The iPhone 18 Pro weighs 7.44 oz (211 g).
Will an iPhone 17 Pro case fit the iPhone 18 Pro?
Usually, yes, because the dimensions are identical. Cases with tight individual camera rings can be a problem, so check our iPhone 17 case fit guide before reusing one.
How big is the iPhone Duo when folded?
Folded, the iPhone Duo is 117.8 x 84.1 x 11.3 mm with a 5.4-inch cover screen. Unfolded, it's 117.8 x 164.6 x 5.2 mm with a 7.6-inch inner screen, and it weighs 8.96 oz (254 g).