Use this free iphone storage calculator to estimate how many gigabytes your photos, videos, apps, games, and music actually use — then see which iPhone storage tier (128GB, 256GB, 512GB, or 1TB) fits you best with comfortable headroom.
| Photos (count) | |
| Video recorded (minutes) | |
| Apps (count) | |
| Games (count) | |
| Offline music tracks | |
| Other files / docs (GB) |
Tip: estimates include ~12GB of iOS system overhead and add 25% headroom so you don’t fill the device. 4K60 video is the biggest space eater.
How this iPhone storage calculator works
Enter how many photos, minutes of video, apps, games, and offline music tracks you keep on your phone. The tool multiplies each by a realistic per-item size — about 3.5MB per photo, 350MB per minute of 4K60 video, 250MB per app, 3GB per game, and 8MB per music track — then adds roughly 12GB of iOS system overhead. The total is your estimated real-world usage.
Why we recommend a bigger tier than your usage
Filling an iPhone to the brim slows it down and leaves no room for iOS updates, new photos, or app caches. That’s why this calculator multiplies your estimate by 1.25 (25% headroom) before snapping up to the next Apple storage tier — 128GB, 256GB, 512GB, or 1TB. If your needs exceed 1TB, a Pro Max model is the only iPhone that offers it.
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