Image Size Calculator
Work out aspect ratios, crops, print sizes at any DPI, @2x and @3x screen sizes and how much memory an image needs.
Aspect ratio
4:3
1.333 to 1 · landscape · the common 4:3 (phone cameras, tablets, slides)
| Ratio | Crop | Kept | Used for |
|---|---|---|---|
| 1:1 | 3,024 × 3,024 | 75% | Square posts and avatars |
| 5:4 | 3,780 × 3,024 | 94% | 8 × 10 prints, older monitors |
| 4:3 | 4,032 × 3,024 | 100% | Phone cameras, tablets, slides |
| 3:2 | 4,032 × 2,688 | 89% | Most other cameras, 4 × 6 prints |
| 16:10 | 4,032 × 2,520 | 83% | Laptop screens |
| 16:9 | 4,032 × 2,268 | 75% | Video, TVs and presentations |
| 1.91:1 | 4,032 × 2,111 | 70% | Link previews (1200 × 630) |
| 2:1 | 4,032 × 2,016 | 67% | Panoramas and wide banners |
| 21:9 | 4,032 × 1,701 | 56% | Ultrawide screens (2560 × 1080) |
Print size
13.44 × 10.08 in · 34.1 × 25.6 cm at 300 DPI
- Filling A4 (landscape) 345 DPI · Photo quality
- Fitting on it with a border 366 DPI
- Pixels for A4 at 300 DPI 3,508 × 2,480
| At | Inches | Centimetres | Good for |
|---|---|---|---|
| 300 DPI | 13.4 × 10.1 | 34.1 × 25.6 | Photo quality |
| 240 DPI | 16.8 × 12.6 | 42.7 × 32 | Good for most prints |
| 150 DPI | 26.9 × 20.2 | 68.3 × 51.2 | Fine from a distance, like a poster |
Dots per inch on paper. 300 is the usual aim for photos looked at up close; posters seen from a few steps away can use much less.
Screens
High-density screens use several device pixels for each CSS pixel. An image stays sharp up to its width divided by the screen’s density.
| Density | iOS | Android | Sharp up to (CSS px) | Image for a 4,032 × 3,024 CSS px box |
|---|---|---|---|---|
| 1× | @1x | mdpi | 4,032 × 3,024 | 4,032 × 3,024 |
| 1.5× | – | hdpi | 2,688 × 2,016 | 6,048 × 4,536 |
| 2× | @2x | xhdpi | 2,016 × 1,512 | 8,064 × 6,048 |
| 3× | @3x | xxhdpi | 1,344 × 1,008 | 12,096 × 9,072 |
| 4× | – | xxxhdpi | 1,008 × 756 | 16,128 × 12,096 |
Megapixels and memory
- Megapixels12.2 MP
- Pixels without compression (RGB, 8-bit)36.6 MB
- With transparency (RGBA, 8-bit)48.8 MB
- 16 bits per channel (RGBA)97.5 MB
- Working memory to edit it hereabout 146 MB
A saved JPEG or PNG is much smaller than these, but every app has to unpack the pixels to show or edit the image.
- Interformat can open an image this size without asking first.
About this tool
Type a size in pixels, pick a common one, or drop an image to read its size and saved DPI from the file header without decoding it.
See the aspect ratio in lowest terms and the closest common one, resize without stretching, and get the largest crop at 1:1, 4:5, 16:9 and other ratios with how much of the image each keeps.
For printing, see how large the image prints at any DPI, the resolution it reaches on photo and paper sizes from 4 × 6 in to A1, and how many pixels a print needs. For screens, see the sizes for @1x, @2x and @3x displays and Android densities. It also shows how much memory the image takes once its pixels are unpacked.
Does changing an image’s DPI make it sharper?
No. The DPI saved in a file is only a hint for how large to print it. The number of pixels decides the detail; changing the DPI without resampling just changes the suggested print size.
What DPI do I need for printing?
About 300 for photos looked at up close, 200 to 240 for most other prints, and 150 or even less for posters seen from a few steps away. These are rules of thumb; printers and viewing distance vary.