Galaxy A55 5G hardware and layout reference
Explore why a large physical screen can still be tested with a narrow CSS profile, and distinguish Samsung’s published facts from calculated or assumed values.
Reference scope: Galaxy A55 5G (2024, SM-A556 family), excluding Galaxy A54 and Galaxy A35.
Two measurement layers
The native display values come from Samsung. CSS dimensions are a normalized testing baseline and remain dependent on browser state.
| Field | Reference value | Evidence scope |
|---|---|---|
| Display diagonal | 6.6 inches | Samsung specification: 6.6-inch full rectangle, 6.4 inches accounting for rounded corners. |
| Native pixel grid | 1080 × 2340 | Samsung specification for the SM-A556 display: 1080 × 2340. |
| Pixel density | 390 PPI | Calculated estimate: sqrt(1080² + 2340²) ÷ 6.6 ≈ 390 PPI; Samsung does not state this PPI on the cited page. |
| CSS viewport | 360 × 780 CSS px | Retained narrow-phone QA scenario; no real-device browser measurement in this review. |
| Device pixel ratio | 3 | Assumed scenario value of 3; not verified as a One UI or browser default. |
| Record year | 2024 | Model-generation context; verify the exact configuration. |
| Reference CSS area | 280,800 CSS px² | Calculated from the normalized width and height; not physical screen area. |
Manufacturer-verified layer
Samsung distinguishes the 6.6-inch full rectangle from 6.4 inches accounting for rounded corners and lists a Super AMOLED display with a maximum 120 Hz refresh rate. Our approximate density uses the full-rectangle diagonal; it must not be labelled a Samsung-stated PPI.
Browser-dependent layer
A 360-pixel scenario leaves less horizontal room than the Pixel 8a’s 412-pixel profile despite the A55’s larger stated diagonal. This is a practical demonstration of why screen inches and CSS width should not be used interchangeably in responsive design.
At DPR 3, the mapping uses 3 in each direction and 9 raster pixel units of area (DPR²). Browser zoom, OS scaling, and device downsampling can change the observed result.
Responsive testing decisions
This record helps teams test constrained CSS space without confusing the physical size of a handset with the space available to a page.
Run address, shipping and payment controls at 360 CSS pixels. Make sure labels and validation messages can wrap without hiding the selected option or the submit action.
Compare the A55 and Pixel 8a profiles using identical content. Keep the result tied to the selected CSS widths rather than claiming the larger physical phone always displays more columns.
Use the PPI calculator with 1080, 2340 and 6.6 to reproduce the estimate. Changing the rounded diagonal changes the result, so do not present 390 as a laboratory measurement.
When testing on an available device, identify the browser explicitly and record One UI display scaling, text size and live viewport values. An emulator geometry test cannot verify those settings.
Limits of a static record
A model name and portrait reference cannot reproduce every browser, accessibility, orientation, keyboard, or safe-area condition.
Evidence and provenance
Samsung lists a 6.6-inch full-rectangle display and 1080 × 2340 native pixels for Galaxy A55 5G. The approximately 390 PPI value is calculated from that rounded diagonal, not published by Samsung on the cited page. The 360 × 780 CSS profile at assumed DPR 3 is a testing scenario. No real-device browser measurement was performed for this review.
Review method: AI-assisted desk review checked Samsung’s SM-A556 display diagonal and native resolution. PPI was calculated as sqrt(1080² + 2340²) ÷ 6.6 and rounded to 390. The retained 360 × 780 CSS profile and DPR 3 are unmeasured assumptions, not Samsung browser specifications.
Reviewed September 5, 2026 by ScreenMetricLab Editorial Team.
Frequently asked questions
The cited Samsung page publishes diagonal and resolution but not PPI. About 390 PPI is our rounded calculation using the 6.6-inch full rectangle.
Physical inches do not determine CSS width. This is a retained narrow-layout scenario; the actual browser width depends on device settings and must be measured.
Samsung reports 6.6 inches for the full rectangle and 6.4 inches when accounting for rounded corners. Neither is the phone’s body height or the CSS viewport.
No. This review did not measure a real-device browser. Record browser name, version and live dimensions before using the profile to reproduce a Samsung-specific issue.
Continue testing
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Samsung Galaxy S24 has a 6.2-inch display and 1080 × 2340 native pixels. Review its sourced hardware facts, CSS profile, DPR limits and practical QA uses.
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Google Pixel 8a: 6.1-inch display, 1080 × 2400 pixels and 430 PPI, with a clearly labelled 412 × 915 CSS testing profile and live-check guidance.
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OnePlus 12 has a 6.82-inch display and 1440 × 3168 pixels at 510 PPI. See the calculated 450 × 990 CSS scenario and its explicit DPR assumptions.
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Samsung Galaxy S23 Ultra has a 6.8-inch display and 1440 × 3088 native pixels. Review its sourced hardware facts, CSS profile, DPR limits and practical QA uses.
View referenceLive browser tool
Measure the current layout and visual viewport before recording a device-specific QA result.
Check viewportMobile layout guide
Keep controls clear of rounded corners, browser UI, and device safe-area boundaries.
Read guide