iPhone 18 Series Screen Size

Quick answer: The iPhone 18 Pro has a 6.3-inch display, the iPhone 18 Pro Max has a 6.9-inch display, and the foldable iPhone Duo has a 7.6-inch inner display with a 5.4-inch outer display. The standard iPhone 18 (expected 6.3 inches), iPhone 18e (expected about 6.1 inches) and iPhone Air 2 (expected about 6.55 inches) have not been announced yet and are rumored for spring 2027.

Apple changed the way it launches iPhones this year. Instead of releasing the full lineup in September, it announced the iPhone 18 Pro, iPhone 18 Pro Max and its first foldable, the iPhone Duo, on September 9, 2026. The cheaper models are expected to follow months later. That split makes it confusing to answer a simple question: what is the screen size of each iPhone 18 model?

This guide puts every iPhone 18 series screen size in one place, with official Apple numbers for the released models, clearly labeled rumors for the upcoming ones, resolutions, pixel density, body dimensions, and the CSS viewport sizes web designers need for responsive testing.

Key Takeaways

• iPhone 18 Pro: 6.3-inch Super Retina XDR OLED, 2622 × 1206 pixels, 460 ppi.
• iPhone 18 Pro Max: 6.9-inch Super Retina XDR OLED, 2868 × 1320 pixels, 460 ppi.
• iPhone Duo (foldable): 7.6-inch inner display (2670 × 1878, 430 ppi) and 5.4-inch outer display (2034 × 1398, 460 ppi).
• iPhone 18 (rumored): 6.3 inches, same size as the iPhone 17, expected spring 2027.
• iPhone 18e (rumored): about 6.1 inches (reported 6.12 inches), 60Hz, expected spring 2027.
• iPhone Air 2 (rumored): about 6.55 inches, 120Hz, expected spring 2027 but least certain.
• The Pro and Pro Max keep the exact same screen sizes as the iPhone 16 Pro and iPhone 17 Pro generations.

iPhone 18 Series Screen Size Comparison Table

Here is every iPhone 18 series model side by side. Sizes for the iPhone 18 Pro, Pro Max and Duo come from Apple’s official tech specs. Sizes for the spring 2027 models are based on supply chain leaks and may change.

iPhone 18 Pro Screen Size: 6.3 Inches

The iPhone 18 Pro uses a 6.3-inch Super Retina XDR OLED display with a resolution of 2622 × 1206 pixels at 460 pixels per inch. Apple notes that the screen has rounded corners, so the 6.3-inch figure is rounded up. Measured as a standard rectangle, the diagonal is 6.27 inches, and the actual viewable area is slightly smaller.

The display includes the Dynamic Island, an Always-On mode, and ProMotion with adaptive refresh rates up to 120Hz. Brightness is rated at 1,000 nits typical, 1,600 nits peak for HDR, and 3,000 nits peak outdoors, dropping as low as 1 nit in dark rooms.

iPhone 18 Pro Dimensions

• Height: 150.0 mm (5.91 inches)
• Width: 71.9 mm (2.83 inches)
• Depth: 8.75 mm (0.34 inches)
• Weight: 211 grams (7.44 ounces)

If you want a phone you can use comfortably with one hand, the 18 Pro is the most compact Pro model in the lineup. The screen size is unchanged from the iPhone 17 Pro and iPhone 16 Pro, so cases and screen protectors sized for 6.3-inch models are worth double-checking, but the display itself is the same size.

iPhone 18 Pro Max Screen Size: 6.9 Inches

The iPhone 18 Pro Max has the biggest slab-style screen in the series: a 6.9-inch Super Retina XDR OLED display at 2868 × 1320 pixels and 460 ppi. As a standard rectangle, the diagonal measures 6.86 inches.

It shares every display feature with the 18 Pro, including ProMotion up to 120Hz, Always-On, HDR, True Tone, a 2,000,000:1 contrast ratio and an anti-reflective coating. The only difference is size.

iPhone 18 Pro Max Dimensions

• Height: 163.4 mm (6.43 inches)
• Width: 78.0 mm (3.07 inches)
• Depth: 8.75 mm (0.34 inches)
• Weight: 249 grams (8.78 ounces)

Reviewers have pointed out that the 18 Pro Max shares its outer measurements with the iPhone 17 Pro Max, though it is a little heavier. At 78 mm wide, it is a two-handed phone for most people, but it gives you the most screen space for video, reading and gaming without stepping up to a foldable.

iPhone Duo Screen Size: 7.6-Inch Inner and 5.4-Inch Outer

The iPhone Duo is Apple’s first foldable and the largest iPhone display ever made. It uses a book-style design with two screens:

• Inner display: 7.6 inches (7.58 inches as a standard rectangle), 2670 × 1878 pixels, 430 ppi. Apple says it is about 50% larger than the iPhone 18 Pro Max screen.
• Outer display: 5.4 inches (5.36 inches as a standard rectangle), 2034 × 1398 pixels, 460 ppi. Apple says it gives you about 90% of the screen area of the iPhone 18 Pro.

Both screens share the same aspect ratio, so apps scale smoothly when you open or close the phone. Both also support ProMotion, Always-On and up to 3,000 nits of outdoor brightness. For a deeper look at the foldable, including how the two screens compare to other foldables, read our full iPhone Duo screen size guide.

iPhone 18, iPhone 18e and iPhone Air 2 Screen Size (Rumored)

Apple did not announce the standard iPhone 18 at its September 2026 event. Multiple reports point to a spring 2027 launch for the iPhone 18, iPhone 18e and a second-generation iPhone Air. Until Apple confirms them, treat these sizes as expected, not final.

iPhone 18: Expected 6.3 Inches

The standard iPhone 18 is expected to keep the same 6.3-inch display as the iPhone 17, with a 120Hz LTPO OLED panel. No major design changes are rumored, though some reports mention a smaller Dynamic Island.

iPhone 18e: Expected About 6.1 Inches

The budget iPhone 18e is reported to use a 6.12-inch LTPS OLED panel at 60Hz, only fractionally larger than the iPhone 17e. If accurate, it will be the smallest new phone in the iPhone 18 family apart from the Duo’s outer screen.

iPhone Air 2: Expected About 6.55 Inches

Leaks suggest the iPhone Air 2 will have a 6.55-inch 120Hz LTPO OLED display, slightly larger than the original iPhone Air. This is the least certain model in the lineup, so its size and launch timing could still change.

Smallest to Largest: iPhone 18 Series Screen Sizes Ranked

1. iPhone Duo outer display: 5.4 inches
2. iPhone 18e: ~6.1 inches (rumored)
3. iPhone 18 Pro: 6.3 inches
4. iPhone 18: 6.3 inches (rumored)
5. iPhone Air 2: ~6.55 inches (rumored)
6. iPhone 18 Pro Max: 6.9 inches
7. iPhone Duo inner display: 7.6 inches

iPhone 18 vs iPhone 17: Did the Screen Size Change?

No. The iPhone 18 Pro and Pro Max use the same 6.3-inch and 6.9-inch sizes, with the same 2622 × 1206 and 2868 × 1320 resolutions, as the iPhone 17 Pro and Pro Max. Apple has used these two sizes since the iPhone 16 Pro generation. The real screen-size news this year is the iPhone Duo, which adds a 7.6-inch option to the iPhone family for the first time.

iPhone 18 Viewport Sizes for Web Designers and Developers

If you build websites, the physical screen size matters less than the CSS viewport size (the size in points that the browser reports). The iPhone 18 Pro and Pro Max render at 3× scale, so you divide the pixel resolution by three:

Because these match the iPhone 16 Pro and 17 Pro viewports, your existing responsive breakpoints will keep working. The iPhone Duo is the bigger challenge: its 7.6-inch inner screen is closer in shape to a small tablet than a phone, so test layouts at both a narrow phone width and a wider, near-square width. Apple has not published an official point resolution for the Duo yet, so check it in Safari’s developer tools on a real device or simulator.

A few practical tips for WordPress and WooCommerce sites:

• Use fluid layouts and relative units instead of fixed pixel widths, so content adapts to 402 px, 440 px and foldable widths.
• Respect the safe area around the Dynamic Island with env(safe-area-inset-*) values when building full-width headers.
• OLED screens make dark interfaces look sharp and can save battery. Adding a dark mode toggle with a plugin like Dusky Dark Mode gives iPhone visitors a more comfortable reading experience at night.
• Bigger screens do not fix accessibility problems. Check contrast and text sizing with one of the best accessibility plugins for WordPress.

Which iPhone 18 Screen Size Should You Choose?

• Choose the iPhone 18 Pro (6.3 inches) if you want a premium phone that fits in one hand and slips easily into a pocket.
• Choose the iPhone 18 Pro Max (6.9 inches) if you watch a lot of video, game on your phone or want the longest battery life in a traditional design.
• Choose the iPhone Duo (7.6 / 5.4 inches) if you want a compact phone that opens into a mini-tablet for reading, multitasking and editing, and you are comfortable with its premium price.
• Wait for spring 2027 if you want the more affordable iPhone 18, iPhone 18e or iPhone Air 2.

Final Thoughts

The iPhone 18 series sticks with proven sizes for its Pro models, a 6.3-inch iPhone 18 Pro and a 6.9-inch iPhone 18 Pro Max, while the iPhone Duo pushes the lineup to 7.6 inches for the first time. The standard iPhone 18, iPhone 18e and iPhone Air 2 are still on the way, so we will update this guide with official screen sizes as soon as Apple announces them. For more tech guides and WordPress tips, browse the CodeConfig blog.

Sources: Apple iPhone 18 Pro and Pro Max Tech Specs, Apple Support: iPhone 18 Pro, Apple Support: iPhone 18 Pro Max, Apple Newsroom: Apple unveils iPhone Duo, GSMArena: iPhone 18, 18e and Air 2 screen leak.