Screen Resolution Calculator

How to use

1. 1Pick Identify a resolution, then type the width and height in pixels, or tap a common preset like 1920 x 1080 or 2560 x 1440.
2. 2Read the simplified aspect ratio, the decimal ratio, the closest standard ratio, and the common name when the size matches a known standard exactly.
3. 3Check the orientation, total pixel count, and megapixels, then use Copy summary to save the full breakdown.
4. 4Browse the matching standard resolutions that share the same ratio, or the full reference table, and tap any row to load it.
5. 5Switch to Scale keeping ratio, enter an original resolution, lock width or height, and type a new value to get the other dimension at the same proportions.
6. 6Watch for the rounding note when a scaled dimension is not a whole pixel. Everything is calculated locally in your browser.

About this tool

The Screen Resolution Calculator answers the questions people actually ask about a pixel resolution: what aspect ratio is it, what is it called, how many megapixels is that, and how do I scale it without distorting the picture. You type a width and height, such as 2560 and 1440, and it instantly reports the simplified aspect ratio, the decimal ratio, the closest named standard ratio, the common consumer name where one exists, the orientation, the total pixel count, and the megapixels. The aspect ratio is computed the correct way, by dividing both the width and the height by their greatest common divisor, so 1920 x 1080 reduces cleanly to 16:9 and 2560 x 1080 reduces to 64:27, the exact ratio behind the 21:9 ultrawide label. Not every resolution reduces to a textbook ratio. A 1366 x 768 laptop panel, for example, does not, so instead of forcing a misleading label the tool reports the closest standard ratio and how far off it is as a percentage, which is far more honest than rounding 1366 x 768 to a flat 16:9. A common name like 1080p (Full HD), 1440p (QHD or 2K), or 2160p (4K UHD) is shown only when the width and height match a known standard exactly, so the tool never invents a name for an unusual size. The megapixel figure is the total pixel count divided by one million, the same number a camera sensor is rated with, so you can compare a 4K frame at about 8.3 MP against an 8K frame at about 33 MP at a glance. A second mode handles scaling. You enter an original resolution, lock the dimension you know, and type a new width or height; the other side is multiplied by the same scale factor so the proportions stay identical, which is exactly what you need when picking an export size, an upscale or downscale target, or a thumbnail. Because pixels are whole numbers, a scaled dimension sometimes lands on a fractional value, and when that happens the tool rounds to the nearest whole pixel and shows the exact value so you know the ratio is close but not perfectly exact. A reference table lists the resolutions people search for most, from VGA up through 8K and across 16:9, 16:10, 4:3, 5:4, 3:2, 21:9, and 32:9, each with its reduced ratio and megapixel count, and every row and every match is clickable to load it straight into the calculator. All of this is plain integer arithmetic and a Euclidean greatest common divisor, computed entirely in your browser. The width and height you enter are never uploaded, never logged, and never leave your device.

Free to use. Works in your browser. No signup, no login.