iPhone 17 vs iPhone 16: Size Differences & What It Means for Your Accessories
By WillItSnap Team · March 15, 2026
Apple's iPhone 17 lineup brings significant changes to the form factor across every tier. Whether you're upgrading from an iPhone 16, 16 Plus, 16 Pro, or 16 Pro Max, understanding the exact size differences is critical before you re-use old cases, screen protectors, or car mounts.
Below, we compare every iPhone 17 model against its iPhone 16 counterpart using real dimensions from our database — no estimates or rumors. Every number you see is pulled directly from verified specs.
Complete Dimension Comparison
| Model | Height (mm) | Width (mm) | Thickness (mm) | Weight (g) | Camera Layout | Port |
|---|---|---|---|---|---|---|
| Apple iPhone 17 | 149.6 | 71.5 | 7.95 | 177 | vertical-dual | usb-c |
| Apple iPhone Air | 156.2 | 74.7 | 5.64 | 165 | single | usb-c |
| Apple iPhone 17 Pro | 150 | 71.9 | 8.75 | 206 | horizontal-bar | usb-c |
| Apple iPhone 17 Pro Max | 163.4 | 78 | 8.75 | 233 | horizontal-bar | usb-c |
| Apple iPhone 16 | 147.6 | 71.6 | 7.8 | 170 | vertical-dual | usb-c |
| Apple iPhone 16 Plus | 160.9 | 77.8 | 7.8 | 199 | vertical-dual | usb-c |
| Apple iPhone 16 Pro | 149.6 | 71.5 | 8.25 | 199 | square-triple | usb-c |
| Apple iPhone 16 Pro Max | 163 | 77.6 | 8.25 | 227 | square-triple | usb-c |
Tier-by-Tier Breakdown
Each iPhone 17 model is compared to the iPhone 16 model it replaces.
Standard: iPhone 17 vs iPhone 16
| Model | Height (mm) | Width (mm) | Thickness (mm) | Weight (g) | Camera Layout | Port |
|---|---|---|---|---|---|---|
| Apple iPhone 17 | 149.6 | 71.5 | 7.95 | 177 | vertical-dual | usb-c |
| Apple iPhone 16 | 147.6 | 71.6 | 7.8 | 170 | vertical-dual | usb-c |
Height
+2.0mmWidth
-0.1mmThickness
+0.2mmWeight
+7.0gCase compatibility: Not Compatible (score: 60/100)
- Height difference too large — case won't fit
Screen protector: Not Compatible
New Form Factor: iPhone Air vs iPhone 16 Plus
| Model | Height (mm) | Width (mm) | Thickness (mm) | Weight (g) | Camera Layout | Port |
|---|---|---|---|---|---|---|
| Apple iPhone Air | 156.2 | 74.7 | 5.64 | 165 | single | usb-c |
| Apple iPhone 16 Plus | 160.9 | 77.8 | 7.8 | 199 | vertical-dual | usb-c |
Height
-4.7mmWidth
-3.1mmThickness
-2.2mmWeight
-34.0gCase compatibility: Not Compatible (score: 0/100)
- Camera module layout is different — cutout won't align
Screen protector: Not Compatible
Pro: iPhone 17 Pro vs iPhone 16 Pro
| Model | Height (mm) | Width (mm) | Thickness (mm) | Weight (g) | Camera Layout | Port |
|---|---|---|---|---|---|---|
| Apple iPhone 17 Pro | 150 | 71.9 | 8.75 | 206 | horizontal-bar | usb-c |
| Apple iPhone 16 Pro | 149.6 | 71.5 | 8.25 | 199 | square-triple | usb-c |
Height
+0.4mmWidth
+0.4mmThickness
+0.5mmWeight
+7.0gCase compatibility: Not Compatible (score: 0/100)
- Camera module layout is different — cutout won't align
Screen protector: Not Compatible
Pro Max: iPhone 17 Pro Max vs iPhone 16 Pro Max
| Model | Height (mm) | Width (mm) | Thickness (mm) | Weight (g) | Camera Layout | Port |
|---|---|---|---|---|---|---|
| Apple iPhone 17 Pro Max | 163.4 | 78 | 8.75 | 233 | horizontal-bar | usb-c |
| Apple iPhone 16 Pro Max | 163 | 77.6 | 8.25 | 227 | square-triple | usb-c |
Height
+0.4mmWidth
+0.4mmThickness
+0.5mmWeight
+6.0gCase compatibility: Not Compatible (score: 0/100)
- Camera module layout is different — cutout won't align
Screen protector: Not Compatible
The iPhone Air — A New Form Factor
The iPhone Air is Apple's thinnest iPhone ever at just 5.64mm thick. For comparison:
- iPhone 17: 7.95mm (2.3mm thicker)
- iPhone 17 Pro: 8.75mm (3.1mm thicker)
- iPhone 17 Pro Max: 8.75mm (3.1mm thicker)
- iPhone 16 Plus (predecessor): 7.8mm (2.2mm thicker)
At 156.2x74.7mm, the iPhone Air sits between the standard and Pro Max models in screen real estate, but its slim profile at 5.64mm means it requires entirely new cases and accessories. It weighs just 165g, making it one of the lightest large-screen iPhones ever.
What the Size Differences Mean for Accessories
Cases
Across all tiers, iPhone 16 cases will not fit iPhone 17 models. Even where body dimensions are close, Apple has changed the camera module layout and button placement, making old cases incompatible. Here is the compatibility score for each tier:
Standard tier
Score: 60/100 — Will not fit
Pro tier
Score: 0/100 — Will not fit
Pro Max tier
Score: 0/100 — Will not fit
Air vs 16 Plus
Score: 0/100 — Will not fit
Screen Protectors
Screen protectors have much tighter tolerances than cases. Here is whether your iPhone 16 screen protector will work on the corresponding iPhone 17:
- iPhone 16 → iPhone 17: Not compatible — screen sizes are 6.1" vs 6.3"
- iPhone 16 Pro → iPhone 17 Pro: Not compatible — screen sizes are 6.3" vs 6.3"
- iPhone 16 Pro Max → iPhone 17 Pro Max: Not compatible — screen sizes are 6.9" vs 6.9"
- iPhone 16 Plus → iPhone Air: Not compatible — screen sizes are 6.7" vs 6.5"
Car Mounts
Car mount compatibility depends on phone width and MagSafe support. All iPhone 17 models support MagSafe, so magnetic car mounts are the best option.
| Model | Width | Size Category | MagSafe | Fits Standard Mount |
|---|---|---|---|---|
| iPhone 17 | 71.5mm | compact | Yes | Yes |
| iPhone Air | 74.7mm | standard | Yes | Yes |
| iPhone 17 Pro | 71.9mm | compact | Yes | Yes |
| iPhone 17 Pro Max | 78mm | standard | Yes | Yes |
| iPhone 16 | 71.6mm | compact | Yes | Yes |
| iPhone 16 Plus | 77.8mm | standard | Yes | Yes |
| iPhone 16 Pro | 71.5mm | compact | Yes | Yes |
| iPhone 16 Pro Max | 77.6mm | standard | Yes | Yes |
Chargers & Cables
Good news: all iPhone 17 and iPhone 16 models use USB-C, so your existing cables and chargers will work. MagSafe wireless chargers are also cross-compatible. Here are the charging specs:
| Model | Port | Max Wired | Max Wireless | MagSafe |
|---|---|---|---|---|
| iPhone 17 | usb-c | 30W | 25W | Yes |
| iPhone Air | usb-c | 27W | 25W | Yes |
| iPhone 17 Pro | usb-c | 30W | 25W | Yes |
| iPhone 17 Pro Max | usb-c | 30W | 25W | Yes |
| iPhone 16 | usb-c | 27W | 25W | Yes |
| iPhone 16 Plus | usb-c | 27W | 25W | Yes |
| iPhone 16 Pro | usb-c | 30W | 25W | Yes |
| iPhone 16 Pro Max | usb-c | 30W | 25W | Yes |
Shop iPhone 17 Accessories
Shop iPhone Air Accessories
Shop iPhone 17 Pro Accessories
Shop iPhone 17 Pro Max Accessories
Related Comparisons
Key Takeaways
- Cases: No iPhone 16 case will fit any iPhone 17 model. Buy a new case for your specific model.
- Screen protectors: Check the tier-specific results above. Screen protectors are only compatible when screen size, width, and edge type all match.
- Chargers & cables: USB-C chargers and MagSafe chargers carry over from iPhone 16 to iPhone 17. No need to replace these.
- Car mounts: MagSafe car mounts work across both generations. Spring-clamp mounts depend on width, so check the table above.
- iPhone Air: At 5.64mm, this is the thinnest iPhone ever. It requires brand-new accessories — nothing from the iPhone 16 Plus will fit.