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Screen Size Comparison Calculator

ImageMath

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INPUT

Auto Process

Screen A

Preset

Width *

Height *

Diagonal

Screen B

Preset

Width *

Height *

Diagonal

OUTPUT

Client Side

Visual Comparison (to scale)

Side-by-Side Details

Property	Screen A	Screen B
Resolution
Diagonal
Physical Size (W × H)
Screen Area
Aspect Ratio
Total Pixels
PPI
Pixel Pitch
Density Category
Retina (≥ 220 PPI)

Summary

Enter dimensions for both screens to see comparison.

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Guide

Screen Size Comparison Calculator

Compare two screens side by side at true physical scale. Enter a diagonal size and pixel resolution for each display and instantly see the accurate scaled visual, PPI (pixels per inch), pixel pitch, viewing area, aspect ratio and density category for both screens — together with a plain-language summary of which screen wins on each metric. Built for anyone picking a monitor, tablet, phone or TV who wants to know how two candidates truly compare beyond the marketing diagonal.

How to Use

Pick a device preset for Screen A, or enter width, height and diagonal manually.
Do the same for Screen B. You can mix preset and custom values.
The canvas redraws automatically at the correct relative scale, so a 65-inch TV will look dramatically larger than a 6-inch phone.
Read the details table for PPI, pixel pitch, physical dimensions, area and retina classification, and the summary box for a one-line verdict on sharpness, pixel count and viewing area.
Switch the diagonal unit between inches and centimeters per screen at any time.

Features

Visual side-by-side comparison – a canvas renders both screens at correct relative physical scale, aligned to a common baseline so size differences are immediate.
PPI and pixel pitch – calculated from the Pythagorean diagonal, with retina classification at the 220 PPI threshold.
Viewing area – real physical width, height and total screen area in both inches and centimeters.
Aspect ratio – reduced to simplest form via GCD (for example 16:9, 19.5:9, 4:3).
Density category badge – Android-style ldpi, mdpi, hdpi, xhdpi, xxhdpi, xxxhdpi labels.
Device presets – iPhone 15 Pro, iPhone SE, iPad Pro 12.9\”, MacBook Pro 14\” and 16\”, iMac 24\”, 1080p/1440p/4K monitors, 34\” ultrawide, and 55\”/65\” 4K TVs.
Unit flexibility – diagonal in inches or centimeters, independent per screen.
Plain-language summary – one-line verdicts like “Screen A is 2.3× larger in viewing area than Screen B” and “Screen B is sharper at 461 PPI vs 68 PPI”.

 FAQ

Why does diagonal alone not tell you the screen size?

The diagonal is only one side of a right triangle formed by the screen's width and height. Two displays with the same diagonal but different aspect ratios have different physical widths, heights and viewing areas. A 27-inch 16:9 monitor is physically narrower than a 27-inch 21:9 ultrawide but the ultrawide is also shorter. Viewing area scales roughly with the square of the diagonal only when aspect ratio is held constant, which is why same-diagonal comparisons across shapes mislead.
What is PPI and why does it matter?

PPI stands for pixels per inch and is computed as the diagonal pixel count (square root of width² plus height²) divided by the physical diagonal in inches. Higher PPI means smaller physical pixels, so individual pixels become harder to resolve at a given viewing distance, producing sharper text and imagery. A phone with 460 PPI held at 30 cm looks crisper than a 65-inch 4K TV at 68 PPI viewed from 30 cm — but at a realistic 3 meter viewing distance the TV is effectively just as sharp because the angular pixel size is what the eye perceives.
What is a retina display?

Retina is an Apple marketing term describing pixel densities high enough that a typical viewer cannot distinguish individual pixels at a normal viewing distance. Apple uses different PPI thresholds depending on category: roughly 220 PPI for laptops and desktops viewed at arm's length, 264 for tablets, 326 for handheld phones. This calculator flags any screen at 220 PPI or above as retina to give a consistent baseline, but the true perceptual threshold always depends on viewing distance.
How is pixel pitch related to PPI?

Pixel pitch is the distance between the centers of adjacent pixels, conventionally measured in millimeters. It is the reciprocal of PPI scaled to the millimeter-inch ratio: pitch (mm) equals 25.4 divided by PPI. Lower pitch means denser pixels. LED video walls are specified in pitch (P2.5, P4, P10) because at close distances a 2.5 mm pitch wall looks solid while a 10 mm wall does not. For desktop and handheld displays PPI is the more common specification, but the two quantities carry identical information.