CSS viewport reference
- iPhone 15 Pro Max
- 430 × 932 CSS px
- 27-inch QHD monitor
- 2560 × 1440 CSS px
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.
Reviewed by ScreenMetricLab Editorial Team
Updated 2026-09-20
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.
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
High-density mobile reference for responsive and media checks. By contrast, Desktop QHD reference for wider browser and workspace checks. Choose the measurement layer—CSS viewport, native pixels or physical size—before interpreting the result.
Choose iPhone 15 Pro Max when
- High-density mobile reference for responsive and media checks.
- People whose space, workflow or test coverage is better represented by Iphone 15 Pro Max Screen Size.
Choose 27-inch QHD monitor when
- Desktop QHD reference for wider browser and workspace checks.
- People whose space, workflow or test coverage is better represented by 27 Inch Qhd Monitor Screen Size.
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?
Primary advantage
- iPhone 15 Pro Max
- High-density mobile reference for responsive and media checks
- 27-inch QHD monitor
- Desktop QHD reference for wider browser and workspace checks
Choose the measurement layer—CSS viewport, native pixels or physical size—before interpreting the result.
Responsive-testing role
- iPhone 15 Pro Max
- Use Iphone 15 Pro Max Screen Size as one documented layout scenario
- 27-inch QHD monitor
- Use 27 Inch Qhd Monitor Screen Size as a distinct adjacent scenario
Test real content and neighboring widths; neither record is a universal breakpoint or a substitute for a measured browser state.
Measurement boundary
- iPhone 15 Pro Max
- Keep native pixels, CSS viewport and physical size separate
- 27-inch QHD monitor
- Keep native pixels, CSS viewport and physical size separate
Window size, zoom, operating-system scaling, browser controls and accessibility settings can change usable webpage space.
Scenario matrix
Which option wins for common use cases?
A winner applies only to the stated task. Read the limitation before treating it as a complete product recommendation.
Priority matches the first option
- Recommended
- Iphone 15 Pro Max Screen Size
- Why
- High-density mobile reference for responsive and media checks.
- Limitation
- Confirm product-specific ergonomics, performance and live viewport behavior separately.
Priority matches the second option
- Recommended
- 27 Inch Qhd Monitor Screen Size
- Why
- Desktop QHD reference for wider browser and workspace checks.
- Limitation
- The larger or denser reference is not automatically better for every space or task.
Responsive QA coverage
- Recommended
- Test both references
- Why
- The pair exposes different layout pressures and helps prevent optimization around a single width.
- Limitation
- Emulation checks geometry only; important journeys still need representative browsers and input methods.
Practical considerations
What should you verify before deciding?
- Choose the measurement layer—CSS viewport, native pixels or physical size—before interpreting the result.
- Compare CSS viewport values for layout work and native pixels for hardware or media context; do not use them interchangeably.
- Record browser, operating system, scaling, zoom, orientation and window state when a comparison informs release QA.
- For a purchase, verify exact model dimensions, ergonomics, ports, performance, warranty and accessibility needs separately.
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.
First-party calculation and editorial methodChecked 2026-09-20
ScreenMetricLab display calculation and review methodology
Calculated geometry, normalized comparison fields, source hierarchy and interpretation limits.
Reviewed ScreenMetricLab recordChecked 2026-09-20
Iphone 15 Pro Max Screen Size reviewed device record
Left-side hardware facts, calculation basis, source link and viewport limitations.
Reviewed ScreenMetricLab recordChecked 2026-09-20
27 Inch Qhd Monitor Screen Size reviewed device record
Right-side hardware facts, calculation basis, source link and viewport limitations.
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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