iPhone 16 vs iPhone 15: Size Comparison
The iPhone 16 and 15 have virtually identical external dimensions. The real difference is the screen: 6.3" on the 16 vs 6.1" on the 15, achieved by shrinking bezels. Your iPhone 15 cases won't fit the 16 despite the same body size.
Updated March 2026 · Dimensions from Apple.com official specifications
The short answer
iPhone 16 vs 15 (standard): Same height, same width, same thickness. 1g lighter. The body is identical — Apple used the extra space from thinner bezels to grow the screen from 6.1" to 6.3".
Case compatibility: iPhone 15 cases will not fit the iPhone 16. Despite identical external dimensions, Apple changed the camera module layout and button positioning.
Bigger screen, same phone: The 0.2" screen increase is noticeable for reading and media. It's the most visible size-related change between these two generations.
Full dimensions — iPhone 16 vs 15
| Dimension | iPhone 16 | iPhone 15 | Difference |
|---|---|---|---|
| Height | 147.6mm | 147.6mm | Unchanged |
| Width | 71.6mm | 71.6mm | Unchanged |
| Thickness | 7.80mm | 7.80mm | Unchanged |
| Weight | 170g | 171g | 1g lighter |
| Screen size | 6.3" | 6.1" | +0.2" larger |
| Display type | OLED | OLED | Same |
| Notch type | Dynamic Island | Dynamic Island | Same |
| Released | September 2024 | September 2023 | 1 year newer |
What the numbers actually mean
Screen size increase: 6.1" to 6.3"
The iPhone 16 has a noticeably larger display (0.2 inches diagonal). This makes text easier to read and provides more screen real estate for videos, games, and web browsing. The physical dimensions remain the same — Apple optimized bezel sizes to fit the larger screen.
Case compatibility: your 15 cases won't fit
Despite identical external dimensions, Apple changed the camera module and button positions between generations. iPhone 15 cases won't align properly with the 16's cutouts. Budget for new cases when you upgrade.
Will you feel the difference in your hand?
No. Height, width, and thickness are identical. The 1g weight difference is imperceptible. Pocket fit, one-handed use, and hand comfort are the same. The difference is purely the larger display and internal improvements.
Should you upgrade?
Upgrade from 15 to 16 if…
- You want the latest processor and performance improvements
- You appreciate a larger 6.3" display for media consumption
- You use AI features and want the latest neural engine
- Your iPhone 15 battery health is degrading
Stay on iPhone 15 if…
- Your battery is still strong (80%+ health)
- You don't need Apple's latest AI features
- Your iPhone 15 meets your current needs
- You'd rather wait for a bigger leap (iPhone 17)