Use this reference for 55-inch 4K TV CSS viewport width, physical resolution, DPR, diagonal size, PPI, and responsive testing notes.
55-inch 4K TV viewport details
Brand
Generic
Family
TV
Type
TV
CSS viewport
3840 × 2160
Physical resolution
3840 × 2160
Device pixel ratio
1
Diagonal
55 inches
Pixel density
80 PPI
Aspect ratio
16:9
Source label
Reference TV resolution
Confidence
Reference
Testing note: Common living-room 4K TV baseline for media and presentation comparisons. Browser zoom, OS display scaling, address bars, toolbars, and orientation can change what JavaScript reports on a live webpage.
Visual comparison
Compare viewport shapes
Pick two records and compare CSS viewport or physical resolution shapes. The drawing is scaled for relative size, so it is useful for layout intuition before opening the detailed records.
Left device
Type to filter the device database. Results are grouped by family.
iPhone
Android
iPad
MacBook
Monitor
TV
No matching devices found.
Right device
Type to filter the device database. Results are grouped by family.
iPhone
Android
iPad
MacBook
Monitor
TV
No matching devices found.
CSS viewport comparison
Compare two devices to see the relative area.
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Device
Family · DPR · PPI
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Device
Family · DPR · PPI
Responsive testing notes
How to use this viewport reference
Use 3840 × 2160 as a practical starting point for testing 55-inch 4K TV layouts, then confirm the live viewport in the browser you are targeting.
Test CSS width
Start breakpoint checks around 3840px, then resize slightly above and below that value.
Record DPR
A DPR of 1 affects image sharpness, canvas rendering, and screenshot interpretation.
Verify live values
Use the live checker because browser chrome, orientation, zoom, and OS scaling can change the usable area.
Source and update note
Reference values, not guarantees
This page is built from the ScreenMetricLab device viewport dataset. Values are normalized for practical QA and design use, but they should be verified on real devices or browser emulators before publishing critical layouts.
Record source: Generic 4K TV reference; physical size and scaling should be confirmed for specific models.
Updated 2026-06-26
Device references should be reviewed regularly as browsers, OS scaling, and hardware options change.
Use with live tools
Pair this page with the viewport checker, DPR checker, and screen resolution checker for better QA notes.
Frequently asked questions
What is the CSS viewport size for 55-inch 4K TV?
The reference CSS viewport for 55-inch 4K TV is 3840 × 2160. Live browser values can still change because of zoom, browser UI, OS display scaling, orientation, and responsive mode.
Is viewport size the same as screen resolution?
No. The physical resolution for this device is 3840 × 2160, while the CSS viewport is the layout area that websites normally use for responsive breakpoints.
Which value should I use for responsive testing?
Use the CSS viewport width first when checking breakpoints and layout bugs. Include DPR and physical resolution as extra context in QA reports.
Why can my live result be different from this reference?
Browser chrome, zoom, operating-system scaling, accessibility settings, split view, and orientation can all change the viewport reported by JavaScript.
Related tools
Use these tools to validate this device reference in a live browser.
