Screen Size Calculator

Enter diagonal size, aspect ratio, and resolution to calculate display dimensions and PPI for monitors, TVs, laptops, and other screens.

Diagonal size

Unit

Aspect width

Aspect height

Horizontal resolution px

Vertical resolution px

—Screen width

—Screen height

—Screen area

—Pixel density

—Dot pitch

—Aspect ratio

—Total megapixels

—Resolution class

What the browser can measure

Start with a functional check, measure only what the browser can actually expose, then retest after one change.

ConnectChoose the actual browser-visible device or grant permission when required.

TestConfirm basic signal, input, output, preview or display behavior.

MeasureUse browser-exposed levels, timing, resolution, FPS, axes or event data.

DiagnoseCompare the symptom with the specific diagnostic instead of relying on one number.

RetestRepeat after changing the device, cable, permission, browser or system setting.

Pre-call Mic Webcam Keyboard Mouse Gamepad Display Permissions

Browser boundary
These tools observe browser APIs and local media/event streams. They cannot certify hardware condition, bypass denied permissions, or expose measurements the browser/OS does not provide.

Screen comparison & fit check

Compare the active display area and PPI of a second screen, then check whether the viewable width alone fits an opening.

Compare + fit

Screen B diagonal (in)

Screen B ratio

Screen B resolution

Opening width (in, optional)

Display	Physical size	Area	PPI	Fit check

Physical dimensions exclude bezels. A cabinet or desk opening needs extra clearance for the frame, stand, cables, and ventilation.

Display distance, field-of-view & pixels-per-degree comparison

Keep the primary diagonal/PPI result, then compare two real displays at a chosen viewing distance. This workflow converts diagonal and aspect ratio into physical width, horizontal field of view and pixels per degree (PPD), then estimates the distance at which each display reaches a 60 PPD reference.

Display A diagonal (in)A aspect widthA aspect heightA horizontal pixelsDisplay B diagonal (in)B aspect widthB aspect heightB horizontal pixelsViewing distance (in)

—A horizontal FOV

—A pixels / degree

—B horizontal FOV

—B pixels / degree

—Sharper angular density

Display	Physical width	PPI	FOV	PPD	60-PPD distance

Ready.

PPD is an angular-density comparison, not a guarantee of perceived sharpness. Visual acuity, scaling, content, panel structure and viewing conditions also matter.

Browser-local does not mean laboratory measurement

These pages can report Web API data such as events, stream settings, frame timing and audio samples. They do not certify hardware condition or bypass browser and operating-system limits.

PPI is based on the dimensions the user enters, not browser detection

Physical width/height and PPI are geometric calculations from diagonal, aspect ratio and entered pixel dimensions. The browser does not discover a monitor diagonal or native panel resolution here.