iPhone 16 vs iPhone 15: Complete Comparison
Updated: January 15, 2025
Quick Summary: What's Different?
The iPhone 16 brings subtle but meaningful changes compared to the iPhone 15. Here's the most important part: iPhones 15 cases will NOT fit the iPhone 16 due to dimensional changes.
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Dimension Comparison Table
| Specification | iPhone 16 | iPhone 15 | Difference |
|---|---|---|---|
| Height | 147.6 mm | 147.6 mm | No change |
| Width | 71.6 mm | 71.6 mm | No change |
| Thickness | 7.80 mm | 7.80 mm | No change |
| Weight | 170 g | 171 g | -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 |
Key Differences Explained
Screen Size Increase: 6.1" → 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. However, the physical dimensions remain the same, meaning Apple optimized bezel sizes.
Virtually Identical Dimensions
Height, width, and thickness are the same between iPhone 16 and iPhone 15. This means pocket fit, one-handed use, and hand comfort are virtually identical. The difference is purely internal optimization for the larger display.
Slightly Lighter (1 gram)
The iPhone 16 is 1 gram lighter despite the larger screen. This is negligible in real-world use but shows Apple's focus on weight optimization. Holding both phones back-to-back, you won't notice the difference.
Case Compatibility: Important Note
❌ iPhone 15 Cases Will NOT Fit iPhone 16
Despite identical external dimensions, Apple made subtle camera module and button position changes that prevent iPhone 15 cases from fitting properly. If you're upgrading from iPhone 15 to iPhone 16, you'll need new cases.
Same Series Compatibility: iPhone 15 and 15 Plus cases are interchangeable with iPhone 16 and 16 Plus respectively.
Should You Upgrade from iPhone 15 to iPhone 16?
✅ Upgrade if You...
- Want the latest processor and performance improvements
- Appreciate a larger, 6.3" display for media consumption
- Use AI features and want the latest neural engine
- Take lots of photos and want improved computational photography
- Your iPhone 15 battery health is degrading
❌ Skip the Upgrade if...
- Your iPhone 15 battery is still strong (80%+ health)
- You don't use Apple's latest AI features
- You prefer a compact phone (iPhone 15 is still great)
- Your iPhone 15 meets your current needs
- You're concerned about the cost of new cases
Bottom Line: If you have an iPhone 15 less than 1 year old with good battery health, the upgrade isn't critical. The dimensional and weight changes are negligible. Wait for more significant generational leaps (like iPhone 17), unless you specifically need the latest features.
How They Compare to Other Models
Want to see how these fit among all iPhone models?
- Complete iPhone Size Chart → See all 25+ models side-by-side
- iPhone 17 vs 16 Comparison → See the next generation differences
- iPhone Buying Guide → Get recommendations by use case
Shop iPhone 16 or iPhone 15
Frequently Asked Questions
Are iPhone 16 and 15 the same size?
Yes, they're virtually identical in external dimensions. Height, width, and thickness are the same. The only difference is iPhone 16 has a slightly larger display (6.3" vs 6.1") achieved through software optimization.
Will my iPhone 15 case fit an iPhone 16?
No. Despite identical external dimensions, camera and button changes make iPhone 15 cases incompatible. You'll need iPhone 16-specific cases.
Is iPhone 16 worth upgrading from iPhone 15?
Only if you want the latest processor, AI features, or bigger display. If your iPhone 15 works well, waiting for iPhone 17 or 18 is reasonable since dimensional changes are minimal.
Which is better for one-handed use?
Identical. Both are 147.6mm tall with the same ergonomics. Choose based on display preference (6.3" vs 6.1"), not size difference.
How much does iPhone 16 weigh vs iPhone 15?
iPhone 16 is 1 gram lighter (170g vs 171g). Negligible difference - you won't feel it in hand.