Mobile App Size Calculator
The Mobile App Size Calculator estimates an app's download and install size from its code size and image and audio assets. Total = base code + image assets + audio assets; download ≈ 70% of total (compressed) and install ≈ 130% of total (decompressed plus data).
Formula
Total = Base + (Images × Avg KB / 1000) + (Audio × Avg MB)
Download ≈ Total × 0.7 (compressed)
Install ≈ Total × 1.3 (decompressed + data)
Example Calculation
Inputs
- Base App Code Size: 50 MB
- Number of Images: 100
- Avg Image Size: 200 KB
- Number of Audio Files: 20
- Avg Audio File Size: 3 MB
With 50 MB of code, 100 images at 200 KB (20 MB) and 20 audio files at 3 MB (60 MB), the raw total is 130 MB. Download ≈ 130 × 0.7 = 91 MB, and install ≈ 130 × 1.3 = 169 MB.
Frequently asked questions
How is the download size estimated?
App stores compress binaries and assets, so the download is roughly 70% of the raw uncompressed total.
Why is the install size larger than the download?
After downloading, the app is decompressed and may add caches and data, so install size is estimated at about 130% of the raw total.
How are image assets calculated?
Image total (MB) = number of images × average image size in KB ÷ 1000.
Are these exact app store sizes?
No. They are estimates. Real sizes depend on the compression, architecture slices, and on-demand resources each platform uses.
How can I reduce app size?
Compress and resize images, use efficient audio formats, remove unused assets, and rely on on-demand or streamed resources.