Screen Resolution Calculator
What "1080p" Actually Means in Pixels
Resolution names like "1080p," "4K," and "QHD" are shorthand that stuck around long after the display technology behind them changed, and it's easy to lose track of exactly how many pixels each one represents. This calculator takes a raw width and height in pixels and reports the total pixel count, the simplified aspect ratio, and — when the numbers match a recognized industry standard — the name that resolution is commonly known by.
The Formula
The total pixel count and aspect ratio come directly from the two dimensions:
Aspect Ratio = Width : Height, reduced by GCD(Width, Height)
The result is then checked against a table of standard resolutions; an exact width/height match returns the recognized name, while anything else is reported as a non-standard resolution.
Where This Calculation Matters
- Buying or specifying a display — translating a raw pixel spec sheet number into the familiar naming convention used in marketing and reviews.
- Video export settings — confirming a custom render resolution matches (or intentionally doesn't match) a recognized broadcast or streaming standard.
- Web and app design — checking total pixel count when planning asset sizes or performance budgets for a target resolution.
- Troubleshooting display settings — identifying what an unfamiliar reported resolution actually corresponds to.
Recognized Standard Resolutions
| Resolution | Standard Name | Aspect Ratio |
|---|---|---|
| 640 x 480 | VGA | 4:3 |
| 1024 x 768 | XGA | 4:3 |
| 1280 x 720 | HD (720p) | 16:9 |
| 1366 x 768 | WXGA | 683:384 |
| 1920 x 1080 | Full HD (1080p) | 16:9 |
| 2560 x 1440 | QHD (1440p) | 16:9 |
| 3840 x 2160 | 4K UHD (2160p) | 16:9 |
| 7680 x 4320 | 8K UHD (4320p) | 16:9 |
1366x768 is a common laptop resolution, but its width and height don't share a large common factor, so its simplified ratio looks unusual next to the clean 16:9 of most other standards.
How to Use This Calculator
- Enter Width (px).
- Enter Height (px).
- Select Calculate to see total pixel count, simplified aspect ratio, and the matched standard name, if any.
Related Calculations
Need just the simplified ratio for a non-standard size? Use the Aspect Ratio Calculator. To check how sharp that resolution will look on a specific screen size, see the Pixel Density Calculator.