Example: Uncompressed size 36 MB. Change the values above to calculate your own.
About the Image File Size Calculator
Every pixel in an RGB image needs 3 bytes uncompressed, so a 12-megapixel photo is about 36 MB in memory, BMP or uncompressed TIFF. JPG and WebP compression bring that down to a few megabytes.
How to use the Image File Size Calculator
- Enter your numbers (or keep the example).
- The result updates instantly as you type.
- Copy the result, or copy the link: it keeps your numbers so you can share them.
Uncompressed size of common resolutions (24-bit)
| Resolution | Megapixels | Uncompressed | Typical JPG |
|---|---|---|---|
| HD (1280×720) | 0.9216 | 2.76 MB | 276 KB |
| Full HD (1920×1080) | 2.1 | 6.22 MB | 622 KB |
| 4K UHD (3840×2160) | 8.3 | 24.9 MB | 2.49 MB |
| 12 MP phone (4032×3024) | 12.2 | 36.6 MB | 3.66 MB |
| 24 MP camera (6000×4000) | 24 | 72 MB | 7.2 MB |
| 48 MP phone (8064×6048) | 48.8 | 146 MB | 14.6 MB |
How it's calculated
Uncompressed size = width × height × bits per pixel ÷ 8. Compressed sizes are typical ratios for photographs (JPG ≈ 1/10, WebP ≈ 1/14).
Features
- Instant resultsUpdates as you type.
- Shareable linkThe URL keeps your inputs.
- Reference tableCommon values on this page.
- Works offlineRuns in your browser.
Frequently asked questions
Is the Image File Size Calculator free?
Yes, the Image File Size Calculator is free with no sign-up, no limits and no ads covering the result.
Does it work on my phone?
Yes. It works in any modern browser on phones, tablets and computers, and keeps working offline once the page has loaded.
Last updated · Processing happens locally in your browser.