Aspect ratio calculator
Calculate aspect ratios, find missing dimensions when scaling and match preset ratios (16:9, 4:3, 1:1). Essential for responsive design.
- Free, no sign-up
- No data stored
- Reviewed 2026-01-15
Your details
Results
Aspect ratio
16:9
1.7778 · 1920×1080
- Decimal ratio
- 1.77778
- Percentage ratio
- 56.250 %
- Megapixels
- 2.07 MP
- Orientation
- Landscape
- Scaled height
- 720 px
Padding hack
1280 px Width
CSS
.media {
aspect-ratio: 16 / 9;
width: 100%;
}
/* Legacy padding technique */
.media-legacy {
padding-top: 56.250%;
}Sizes table
| Width | Height | Megapixels |
|---|---|---|
| 320 px | 180 px | 0.06 MP |
| 480 px | 270 px | 0.13 MP |
| 640 px | 360 px | 0.23 MP |
| 768 px | 432 px | 0.33 MP |
| 1024 px | 576 px | 0.59 MP |
| 1280 px | 720 px | 0.92 MP |
| 1440 px | 810 px | 1.17 MP |
| 1920 px | 1,080 px | 2.07 MP |
| 2560 px | 1,440 px | 3.69 MP |
| 3840 px | 2,160 px | 8.29 MP |
Common ratios
| Ratio | Used for |
|---|---|
| 16:9 | HD video, YouTube, monitors |
| 9:16 | Stories, Reels, TikTok |
| 4:5 | Instagram portrait |
| 1.91:1 | Facebook / OG image |
| 1200×630 | Open Graph recommended |
| 21:9 | Ultrawide, cinematic |
| 3:2 | DSLR photography |
| 4:3 | Legacy displays, iPad |
About the Aspect Ratio Calculator
Enter width and height to find the simplified aspect ratio. Or enter one dimension and a target ratio to calculate the other. Useful when resizing images, videos or responsive containers while maintaining proportions.
How to use the Aspect Ratio Calculator
- Enter width and height.
- View the simplified aspect ratio.
- Enter a new width to find the proportional height.
- Or select a preset ratio.
Frequently asked questions
What aspect ratio is HD video?
16:9 (1920×1080, 1280×720). Ultra-wide is 21:9. Classic TV was 4:3.
How do I maintain ratio when resizing?
Lock the ratio and change one dimension — the other updates proportionally. New height = new width × (original height / original width).
What ratio should social media images use?
Facebook/LinkedIn: 1.91:1 (1200×628). Instagram feed: 1:1 (1080×1080). Stories: 9:16 (1080×1920). Twitter: 16:9 (1200×675).