Screen area calculator

Screen area calculator is the tool on this page. The control sits above this text. Use it on the display you want to judge, then read what the result can and cannot mean. The target phrase people search is tied to this job, and the explanation below stays with that job instead of repeating a generic review of every display ever made.

A visualizer is a rectangle with a job. Screen size, monitor dimensions, television dimensions, and laptop dimensions all turn a diagonal and an aspect ratio into a width and a height, then draw them so two devices can stand next to each other. The drawing is proportional inside the page. It is not a life-size print unless you calibrate it. The ruler page is the one place Screenz tries to be physical, and it starts by asking you to match a credit card.

A bank card is 85.6 millimetres wide by the ISO standard. Match the white bar to your card. The page then knows how many pixels cover 85.6 millimetres at this zoom, on this display, today. Change the zoom and the calibration dies. That is the whole honesty of an on-screen ruler. Browser zoom, operating-system scaling, and a television's overscan will all lie if you skip the card.

Dual and triple layouts are a sketch of bezels and diagonals, not a CAD file of your desk. Put the larger panel in the center if that is where you look. A 24-inch portrait beside a 27-inch landscape is a common writing desk. The planner shows the relative boxes so you notice that the portrait is tall and narrow before you buy an arm that cannot hold it.

Resolution preview and aspect preview answer a different question from PPI. They show the shape of the pixel grid and the shape of the frame. A 21:9 frame beside a 16:9 frame, same height, is the picture people mean by ultrawide. Usable area subtracts a bezel you type in, because a 27-inch panel with a thick chin is not the same object on a small desk as a thin one.

Screenz is a set of pictures and arithmetic for the display you already have. The picture is drawn by the browser. The arithmetic is the same formula a spec sheet uses, written out so you can change the inputs. Neither one is a laboratory certificate. A dead pixel you can see is real. A refresh number that does not match the sticker is a clue about the operating system, the cable, the battery mode, or the browser, not an automatic failure of the panel.

Use fullscreen when you are hunting a mark. The address bar, the notch, and the rounded corner all hide the edge, and the edge is where a bad pixel and a fold crease like to sit. On a phone, turn the brightness up and turn off the reading tint. On a monitor, leave the preset you actually use, then repeat the test in the neutral preset if you are judging color. Night shift, f.lux, and vivid modes are fine for the evening and misleading for a test.

Dust sits on the glass and moves when you tilt the panel. A dead subpixel stays dark. A stuck subpixel stays lit, so it shows on black. A crease on a foldable is a hinge in the stack. It is not a dead pixel, and a flat color shows it more honestly than a photograph. Pressure spots and backlight bleed on an LCD change with the angle of your head. OLED black should look off, except at the camera hole and along a fold.

The browser cannot measure nits, cannot read EDID on most pages, and cannot promise that a 10-bit ramp is being sent as 10-bit. If a gradient shows steps, the steps may be the panel, the operating system, or the compositor. If a refresh counter reads 60 on a 144 Hz monitor, check the cable, the power plan, and the display setting before you blame the page. Screenz will say this again because it is the difference between a useful test and a false warranty claim.

Photographing the panel with a second phone adds moiré and makes uniformity look worse than it is. Trust your eye at the distance you actually sit. Move closer only to confirm that a mark is in the pixels rather than on the glass. Then wipe the glass and look again. A foldable should be checked twice, cover display and inner display, because they are different diagonals, different pixel densities, and often different aspect ratios.