Monitor size comparison
40" 16:9 vs 45" 21:9: Full Size Comparison
Compare exact dimensions, pixel density, content size, and desk fit for these two displays.
Specifications
| Metric | 40 in 16:9 | 45 in 21:9 | Diff |
|---|---|---|---|
| Width | 34.86" | 41.36" | +18.6% |
| Height | 19.61" | 17.73" | -9.6% |
| Area | 683.7 in² | 733.2 in² | +7.2% |
| Diagonal | 40" | 45" | +12.5% |
| Pixel Density | 55 ppi | 123 ppi | +124.2% |
| 16:9 content | 40" | 36.16" | -9.6% |
| 4:3 content | 32.68" | 29.54" | -9.6% |
| 2.35:1 content | 37.89" | 44.95" | +18.6% |
The 40" 16:9 is 34.86" (88.6 cm) wide and 19.61" (49.8 cm) tall, while the 45" 21:9 is 41.36" (105.1 cm) wide and 17.73" (45 cm) tall. That makes the 45" 21:9 the larger screen by 7.2% of usable area.
The 40" 16:9 measures 34.86" (88.6 cm) wide by 19.61" (49.8 cm) tall, with a total screen area of 683.7 square inches. The 45" 21:9 measures 41.36" (105.1 cm) wide by 17.73" (45 cm) tall, covering 733.2 square inches.
In direct comparison: the 45" 21:9 is 18.6% wider, the 40" 16:9 is 9.6% taller, and 45" 21:9 offers 7.2% more screen area. The width delta is the main desk-fit number, while the height delta shows how much vertical space changes for documents, timelines, and video.
At 1920x1080, the 40" 16:9 achieves 55 PPI. The 45" 21:9 at 5120x2160 reaches 123 PPI. The 45" 21:9 has 124.2% higher pixel density, resulting in sharper text and images.
For 16:9 content (most videos and games), the 40" 16:9 provides an effective diagonal of 40", while the 45" 21:9 provides 36.2". This is crucial when comparing ultrawides to standard displays.
Frequently Asked Questions
- What are the exact dimensions of a 40" 16:9 monitor?
- A 40" 16:9 monitor measures 34.86" (88.6 cm) wide by 19.61" (49.8 cm) tall, with a screen area of 683.7 square inches.
- What are the exact dimensions of a 45" 21:9 monitor?
- A 45" 21:9 monitor measures 41.36" (105.1 cm) wide by 17.73" (45 cm) tall, with a screen area of 733.2 square inches.
- Which is bigger: 40" 16:9 or 45" 21:9?
- The 45" 21:9 is 7.2% larger in total screen area, though the 40" 16:9 may be taller depending on aspect ratio.
- How much desk space do I need for a 45" 21:9?
- A 45" 21:9 requires at least 41.36" of desk width. We recommend 47.36" to allow comfortable margins on each side.
- Which has better pixel density: 40" 16:9 or 45" 21:9?
- The 45" 21:9 at 5120x2160 has 123 PPI, which is 124.2% higher than the 40" 16:9's 55 PPI.
- How does 16:9 content look on these displays?
- On the 40" 16:9, 16:9 content appears at an effective 40" diagonal. On the 45" 21:9, it appears at 36.2". Ultrawides display 16:9 content with black bars on the sides.