Aspect Ratio Calculator3840x2160 at a glance
| Simplified ratio | 16:9 |
|---|---|
| Decimal (width ÷ height) | 1.7778:1 |
| Written as x:9 | 16:9 |
| Closest standard ratio | exactly 16:9 (YouTube, HD/4K video) |
| Megapixels | 8.29 MP (8,294,400 pixels) |
| Pixels compared with 1920 × 1080 | 4× |
| Orientation | Landscape |
| CSS | aspect-ratio: 16 / 9; |
| Padding-top trick | padding-top: 56.25%; |
What is 3840x2160 used for?
The consumer 4K standard: 4K TVs and monitors, UHD Blu-ray, 4K streaming and YouTube 2160p, and the 4K video mode of most cameras and phones. It has exactly four times the pixels of 1080p.
Platform formats that use exactly 3840 × 2160: YouTube videos (4K (2160p)) and YouTube thumbnails (Recommended (4K))
How the ratio is calculated
Divide both sides by their greatest common divisor (GCD). The GCD of 3840 and 2160 is 240, so 3840 ÷ 240 = 16 and 2160 ÷ 240 = 9, which gives 16:9. In CSS that is aspect-ratio: 16 / 9; with the older padding trick the height is 56.25% of the width.
Same-ratio sizes (16:9)
3840x2160 scaled down and up without changing its shape. Rows marked ≈ are rounded to whole pixels, so they are less than one pixel off.
| Size (px) | Scale | Megapixels |
|---|---|---|
| 960 × 540 | 25% | 0.52 |
| 1280 × 720 | 33.3% | 0.92 |
| 1920 × 1080 | 50% | 2.07 |
| 2560 × 1440 | 66.7% | 3.69 |
| 2880 × 1620 | 75% | 4.67 |
| 3840 × 2160 | 100% | 8.29 |
| 5120 × 2880 | 133.3% | 14.75 |
| 5760 × 3240 | 150% | 18.66 |
| 7680 × 4320 | 200% | 33.18 |
Other standard 16:9 resolutions
- 1280 × 720 HD (720p)
- 1920 × 1080 Full HD (1080p)
- 2560 × 1440 QHD (1440p)
- 7680 × 4320 8K UHD (4320p)
- 1536 × 864 HD+ (1080p at 125%)
- 1600 × 900 HD+ (900p)
Nearby common sizes
- 4096 × 2160 ≈ 1.9:1 · DCI 4K (cinema 4K)
- 2732 × 2048 ≈ 4:3 · 12.9-inch iPad Pro
- 3440 × 1440 ≈ 21:9 · UWQHD (ultrawide 1440p)
- 2048 × 1536 4:3 · QXGA (iPad Retina)
Frequently asked questions
What is the aspect ratio of 3840x2160?
3840 × 2160 has an aspect ratio of 16:9. The greatest common divisor of 3840 and 2160 is 240; dividing both sides by it gives 16:9. As a decimal that is 1.7778:1.
How many megapixels is 3840x2160?
3840 × 2160 contains 8,294,400 pixels, or 8.29 megapixels. That is 4× the pixel count of 1920 × 1080 (Full HD).
Which sizes have the same aspect ratio as 3840x2160?
Exact scaled versions include 960 × 540, 1280 × 720, 1920 × 1080, 2560 × 1440, 2880 × 1620, 5120 × 2880, 5760 × 3240, and 7680 × 4320. Standard resolutions with the same 16:9 ratio are 1280 × 720, 1920 × 1080, 2560 × 1440, 7680 × 4320, 1536 × 864, and 1600 × 900. Any size of the form 16n × 9n has exactly the same shape.
How do I resize an image to 3840x2160 without distortion?
Crop it to 16:9 first, then scale it to 3840 × 2160. For any width W the matching height is W × 9 ÷ 16. The calculator on this page does the arithmetic: type a new width in box 2 and it fills in the height.
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