Image Resolution Calculator
Find the pixel dimensions, total pixel count, megapixels, aspect ratio and orientation of an image. Upload an image for local dimension detection or enter the numbers manually.
Calculate image resolution
The file is read in your browser to detect dimensions; it is not uploaded to our server.
Common resolution references
| Name / use | Dimensions | Total pixels | Ratio |
|---|---|---|---|
| HD | 1280 × 720 | 0.92 MP | 16:9 |
| Full HD | 1920 × 1080 | 2.07 MP | 16:9 |
| QHD | 2560 × 1440 | 3.69 MP | 16:9 |
| 4K UHD | 3840 × 2160 | 8.29 MP | 16:9 |
| Square image | 1080 × 1080 | 1.17 MP | 1:1 |
| Portrait post | 1080 × 1350 | 1.46 MP | 4:5 |
Resolution vs aspect ratio
Resolution describes how many pixels an image contains and its pixel width and height. Aspect ratio describes the shape. Two images can share a 16:9 ratio while having different resolutions, such as 1280 × 720 and 3840 × 2160.
Megapixel formula
Megapixels = width × height ÷ 1,000,000. A 1920 × 1080 image contains 2,073,600 pixels, or approximately 2.07 megapixels. Megapixels alone do not tell you print size or visual quality; those also depend on pixel density, image detail and viewing conditions.
Related tools
Resize an image · Crop an image · Pixels to inches · 16:9 guide