Calculate total pixel count, megapixels, and aspect ratio from a width and height, and compare against common named resolutions. This tool works with pixel counts only — it does not convert DPI or PPI.
Enter a width and height to calculate.
| Name | Dimensions | Total Pixels |
|---|---|---|
| SD | 640 × 480 | 307,200 |
| HD (720p) | 1280 × 720 | 921,600 |
| Full HD (1080p) | 1920 × 1080 | 2,073,600 |
| QHD (1440p) | 2560 × 1440 | 3,686,400 |
| 4K UHD | 3840 × 2160 | 8,294,400 |
| 8K UHD | 7680 × 4320 | 33,177,600 |
A digital resolution converter takes a screen, image, or video's width and height in pixels and works out the numbers that describe it: total pixel count, megapixels, and aspect ratio. It also shows how that pixel count compares to widely used named resolutions like 1080p or 4K.
This converter works with pixel counts only. It does not convert DPI (dots per inch) or PPI (pixels per inch), and it makes no claims about physical print or screen size — those depend on pixel density, a separate measurement this tool doesn't collect. If you need a printed or displayed size in inches or centimeters, you'll need to know the PPI/DPI of the specific device or print in addition to the pixel dimensions.
Most common video and display resolutions share a 16:9 aspect ratio, including 720p, 1080p, 1440p, 4K UHD, and 8K UHD — each is a whole-number multiple of the last in both dimensions. Older 4:3 resolutions like standard-definition 640 × 480 use a squarer shape, common before widescreen displays became standard.
Resolution calculations come up when comparing camera or phone specs listed in megapixels, checking whether a video file matches a target platform's resolution requirements, figuring out the aspect ratio of an unfamiliar image size, or understanding how much more detail one resolution captures compared to another.
Given a width and height in pixels, it calculates the total pixel count, the equivalent in megapixels, the simplified aspect ratio, and how that compares in pixel count to common named resolutions like 1080p or 4K UHD.
No. DPI (dots per inch) and PPI (pixels per inch) are density measurements that require a physical size in addition to a pixel count, which this tool does not collect. This converter works with pixel counts only and makes no claims about physical print or screen size.
1920 × 1080 = 2,073,600 pixels, roughly 2.07 megapixels.
3840 × 2160 = 8,294,400 pixels, roughly 8.29 megapixels — exactly 4 times the pixel count of 1080p, since both dimensions are doubled.
By dividing both the width and height by their greatest common divisor, reducing them to the smallest whole-number ratio that describes the same shape — for example, 1920×1080 simplifies to 16:9.
Pixel count alone doesn't determine physical size — the same 1920×1080 image could be a tiny thumbnail or fill a large monitor, depending on pixel density (PPI/DPI), which this tool doesn't ask for or assume.
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