Convert any aspect ratio to exact pixel dimensions. Pick 9:16, enter width 1080 and get 1080 x 1920 px instantly.
9:16, 16:9, 4:3, 1:1, 4:5, 3:2, 21:9 and more · Ratio to pixels, pixels to ratio, resize keeping ratio · Free
Common sizes for 9:16
Here are the most searched ratios and their exact pixel dimensions:
9:16 in pixels
The 9:16 vertical format is used for Instagram Reels, TikTok, YouTube Shorts, and Stories. The standard sizes are 1080 x 1920 px (Full HD), 720 x 1280 px (HD), and 1440 x 2560 px (2K). Height is always 16/9 times the width.
16:9 in pixels
The 16:9 widescreen format is used for YouTube videos, HD monitors, and presentations. Standard sizes: 1920 x 1080 px (1080p), 1280 x 720 px (720p), and 3840 x 2160 px (4K). Width is always 16/9 times the height.
4:3 in pixels
The classic 4:3 ratio is used for iPads, older monitors, and photo prints. Common sizes: 1024 x 768 px, 1920 x 1440 px, and 2048 x 1536 px. Width is 4/3 times the height.
4:5 in pixels
The 4:5 portrait ratio is the tallest format Instagram allows in the feed. The recommended export size is 1080 x 1350 px. Height is 5/4 times the width.
| Ratio | Common pixel sizes | Best for | Crop tool |
|---|---|---|---|
| 9:16 | 720x1280, 1080x1920, 1440x2560 | Instagram Reels, TikTok, YouTube Shorts, Snapchat Stories | Crop to 9:16 |
| 16:9 | 1280x720, 1920x1080, 3840x2160 | YouTube videos, presentations, desktop wallpapers, TV displays | Crop to 16:9 |
| 1:1 | 720x720, 1080x1080, 3000x3000 | Instagram square posts, profile photos, album covers | Crop to 1:1 |
| 4:5 | 864x1080, 1080x1350, 1440x1800 | Instagram portrait feed posts (tallest format allowed) | Crop to 4:5 |
| 3:4 | 768x1024, 1200x1600, 1536x2048 | Mobile portrait photos, e-commerce product shots | Crop to 3:4 |
| 4:3 | 1024x768, 1920x1440, 2048x1536 | Classic photos, iPad wallpapers, older presentation templates | Crop to 4:3 |
| 3:2 | 1800x1200, 2400x1600, 6000x4000 | DSLR photography, 4x6 photo prints, mirrorless cameras | Crop to 3:2 |
| 2:3 | 800x1200, 1000x1500, 1200x1800 | Pinterest pins, portrait photo prints, posters | Crop to 2:3 |
| 5:4 | 1280x1024, 2500x2000, 3000x2400 | 8x10 inch prints, framed portrait photography | Crop to 5:4 |
| 21:9 | 2560x1080, 3440x1440, 5120x2160 | Cinematic photography, ultrawide wallpapers, website banners | Crop to 21:9 |
Once you know the pixel dimensions you need, use the SammaPix crop tools to trim your image to the exact ratio:
Need to resize after cropping? Use the image resizer to scale to any exact pixel size. For compressing the result, see Image Compress. Learn more in the aspect ratio in pixels guide.
What is 9:16 in pixels?
9:16 is a vertical aspect ratio used for Instagram Reels, Stories, TikTok, YouTube Shorts, and Snapchat. The most common 9:16 pixel sizes are 720x1280 (HD), 1080x1920 (Full HD), and 1440x2560 (2K). Any width-to-height pair where height divided by width equals approximately 1.778 is a 9:16 image.
What is 16:9 in pixels?
16:9 is the standard widescreen ratio for YouTube videos, HD displays, and presentations. Common 16:9 pixel sizes are 1280x720 (HD), 1920x1080 (Full HD / 1080p), and 3840x2160 (4K UHD). The ratio means width is approximately 1.778 times the height.
How do I calculate aspect ratio from width and height?
Divide both width and height by their greatest common divisor (GCD). For example, 1920 and 1080 share a GCD of 120, so 1920/120 = 16 and 1080/120 = 9, giving you 16:9. This calculator does that automatically: enter your width and height in the Pixels to ratio tab.
What aspect ratio is 1920x1080?
1920x1080 is 16:9. It is the standard Full HD resolution used for YouTube videos, TV screens, desktop monitors, and presentation slides. Dividing both by their GCD of 120 gives 16 and 9.
What is the most common vertical ratio for social media?
9:16 is the dominant vertical format for social media video: Instagram Reels and Stories, TikTok, YouTube Shorts, and Snapchat all use 9:16 full-screen. The recommended export size is 1080x1920 px. For Instagram feed portrait posts, 4:5 (1080x1350 px) is the recommended format.
Is any data uploaded when I use this calculator?
No. The aspect ratio calculator is a pure math tool that runs entirely in your browser. There is no file upload and no data sent to any server. All calculations happen locally the moment you type a number.