5:4 Aspect Ratio Calculator
CalculatorUnderstanding the 5:4 Proportion
The 5:4 (1.25:1) aspect ratio is the classic proportion of early desktop LCD computing (1280×1024), industrial control panels, and specialized medical imaging.
aspect-ratio: 5 / 4;padding-top: 80.00%;Common 5:4 Resolutions in Pixels
The table below outlines standard industrial resolutions that conform strictly to the 5:4 aspect ratio, including total pixel counts and target display hardware.
| Standard / Format | Dimensions (W × H) | Total Pixels | Megapixels | Common Hardware & Uses |
|---|---|---|---|---|
| Quad SXGA (QSXGA) | 2560 × 2048 | 5,242,880 | 5.24 MP | Medical diagnostic displays (Barco, EIZO RadiForce PACS workstations) |
| SXGA (Standard 5:4 LCD) | 1280 × 1024 | 1,310,720 | 1.31 MP | Standard 17-inch and 19-inch desktop LCD office monitors |
| Half SXGA | 640 × 512 | 327,680 | 0.33 MP | Thermal imaging cameras, infrared sensors, military night-vision feeds |
Where is 5:4 Used?
Standard 17-Inch & 19-Inch Office LCDs
During the massive desktop LCD transition in the early 2000s, millions of 17" and 19" flat panels shipped in 1280×1024 resolution, which is native 5:4.
Medical Imaging & Radiology PACS
Diagnostic radiology monitors (X-ray, MRI, mammography) frequently employ 5:4 panels (such as 2560×2048) because human anatomical scans fit squarish geometry efficiently.
Industrial Automation & CNC Machinery
Factory floors, CNC milling control panels, and warehouse terminals retain ruggedized 5:4 touchscreens due to strict mechanical cabinet dimensions.
Air Traffic Control & Flight Simulators
Specialized 2048×2048 or 1280×1024 radar monitoring displays utilize 5:4 proportions to view expansive 360-degree sector airspace maps without side margins.
Production Tips for 5:4 Assets
- If retrofitting web applications for legacy warehouse terminals, test UI layouts at 1280×1024 without relying on wide horizontal flex grids.
- Keep in mind that 5:4 screens are squarer than standard 4:3; content formatted for 4:3 will produce thin pillarboxes unless scaled.
- In CSS, use `aspect-ratio: 5 / 4;` for industrial dashboard widgets.
Frequently Asked Questions
Why did 1280x1024 use 5:4 instead of 4:3?
In the CRT era, 1280×960 was 4:3. However, early LCD manufacturers added 64 vertical lines to reach 1024 for memory efficiency (2^10), shifting the aspect ratio to 5:4 (1.25:1).
How do I calculate height from width in 5:4?
Multiply width by 4 and divide by 5. For example, for a width of 1280 pixels: (1280 × 4) ÷ 5 = 1024 pixels.
What is 5:4 in decimal form?
5 divided by 4 equals exactly 1.25:1. It is noticeably squarer than 4:3 (1.33:1).
What is the padding-top percentage for 5:4 in CSS?
Dividing 4 by 5 gives 0.80, making the padding-top percentage exactly 80%. In modern CSS, simply write `aspect-ratio: 5 / 4;`.