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Screen comparison tools

Screen Size Comparison Tool

Compare phones, tablets, laptops, monitors, and TVs by CSS viewport, physical resolution, DPR, PPI, and relative screen shape.

At a glance

Measured screen and viewport differences

Values combine normalized device records and transparent geometry calculations. Exact usable area depends on the selected device and viewing mode.

CSS viewport reference

iPhone 15 Pro Max
430 × 932 CSS px
27-inch QHD monitor
2560 × 1440 CSS px

Physical resolution

iPhone 15 Pro Max
1,290 × 2,796 px
27-inch QHD monitor
2,560 × 1,440 px

Diagonal

iPhone 15 Pro Max
6.7 inches
27-inch QHD monitor
27 inches

Calculated panel size

iPhone 15 Pro Max
6.1 × 2.8 inches
27-inch QHD monitor
23.5 × 13.2 inches

Calculated screen area

iPhone 15 Pro Max
17.1 square inches
27-inch QHD monitor
311.5 square inches

Pixel density

iPhone 15 Pro Max
460 PPI
27-inch QHD monitor
108.79 PPI

Aspect ratio

iPhone 15 Pro Max
19.5:9
27-inch QHD monitor
16:9

Device pixel ratio

iPhone 15 Pro Max
DPR 3
27-inch QHD monitor
DPR 1

Decision guide

Choose the screen that fits the task

Use this comparison tool before choosing a target viewport, testing responsive layouts, or explaining why two displays with different physical sizes can behave very differently in CSS.

Choose iPhone 15 Pro Max when

  • Compare CSS viewport shapes before QA testing.
  • Compare physical pixel grids for screenshots and media planning.
Review iPhone 15 Pro Max data

Choose 27-inch QHD monitor when

  • Compare physical pixel grids for screenshots and media planning.
  • Explain DPR, PPI, and resolution differences to designers or clients.
Review 27-inch QHD monitor data

Visual comparison

Compare screen shapes

Compare physical screen proportions and native pixel grids, or switch to CSS viewport references for responsive-layout work. Every drawing uses one shared scale so the relative size remains meaningful.

Left device
Right device

CSS viewport comparison

Compare two devices to see the relative area.

—

iPhone 15 Pro Max

iPhone · DPR 3 · 460 PPI

—

27-inch QHD monitor

Monitor · DPR 1 · 108.79 PPI

Proportional comparison of iPhone 15 Pro Max and 27-inch QHD monitor using physical screen dimensions, CSS viewport references, or native pixel grids.

Decision factors

What materially changes between these displays?

CSS viewport area

iPhone 15 Pro Max
400,760 CSS pixels
27-inch QHD monitor
3,686,400 CSS pixels

27-inch QHD monitor provides about 820% more normalized viewport area in this reference pair.

Physical pixel count

iPhone 15 Pro Max
3,606,840 pixels
27-inch QHD monitor
3,686,400 pixels

Physical pixels help explain screenshot and media detail; live layout still follows the browser viewport and scaling.

Physical display area

iPhone 15 Pro Max
17.1 square inches
27-inch QHD monitor
311.5 square inches

27-inch QHD monitor is the larger calculated panel, excluding bezels, curvature, stands, hinges, and chassis.

Practical considerations

What should you verify before deciding?

  • Compare CSS viewport shapes before QA testing.
  • Compare physical pixel grids for screenshots and media planning.
  • Explain DPR, PPI, and resolution differences to designers or clients.

Methodology and sources

Calculation method and evidence

Physical dimensions are calculated from diagonal and aspect ratio. Named-product hardware claims use manufacturer specifications; CSS viewports remain practical browser references.

How the geometry is calculated

Width and height divide the diagonal using the stated aspect ratio. Screen area is width × height, and PPI divides the diagonal pixel count by the diagonal inches.

Reviewed under the ScreenMetricLab methodology and editorial policy. Reference values are not a substitute for checking the exact model, browser, scaling, and accessibility settings you will use.

Frequently asked questions

Questions about this comparison

Should I compare viewport size or physical resolution?

Use viewport size for responsive CSS layout decisions. Use physical resolution for display context, screenshots, and media sharpness.

Why can a phone have more pixels than a monitor?

High-DPI phones pack many physical pixels into a small display, while CSS viewport size remains much smaller.

Is the visual comparison exact?

It is a scaled reference for layout intuition. Browser zoom, OS scaling, and device modes can change live reported values.

Continue the cluster

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Follow a shared device, move to a neighbouring size, or use the supporting calculators to verify the next decision.

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