Photo Aspect Ratio Converter
Calculate crop dimensions for 4:3, 16:9, 3:2, 1:1, and other common photo aspect ratios.
Enter width or height to see the matching dimension.
Select an aspect ratio and enter one dimension — the other calculates automatically.
Dimensions
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Aspect ratio describes the proportional relationship between the width and height of an image. It is expressed as two numbers separated by a colon, such as 4:3 or 16:9.
How to calculate dimensions from an aspect ratio:
- If you know the width: Height = Width / (ratio width / ratio height)
- If you know the height: Width = Height x (ratio width / ratio height)
- Example: For a 16:9 image that is 1920 pixels wide: Height = 1920 / (16/9) = 1080 pixels
Common aspect ratios and their uses:
| Ratio | Decimal | Common Uses |
|---|---|---|
| 1:1 | 1.000 | Instagram square posts, profile pictures, album art |
| 4:3 | 1.333 | Classic TV, iPad screen, most compact cameras, PowerPoint slides |
| 3:2 | 1.500 | DSLR cameras, 35mm film, 6x4 inch prints |
| 16:9 | 1.778 | Widescreen TV, YouTube, most monitors, smartphones (landscape) |
| 16:10 | 1.600 | MacBook screens, some monitors |
| 21:9 | 2.333 | Ultrawide monitors, cinematic displays |
| 9:16 | 0.5625 | Smartphone vertical video (TikTok, Instagram Reels, YouTube Shorts) |
| 2:3 | 0.667 | Portrait orientation DSLR, book covers |
| 4:5 | 0.800 | Instagram portrait posts (recommended) |
| 5:4 | 1.250 | 8x10 inch prints, some older monitors |
Common print sizes and their actual aspect ratios:
| Print Size | Aspect Ratio | Exact Ratio |
|---|---|---|
| 4 x 6 inches (10 x 15 cm) | 3:2 | 1.500 |
| 5 x 7 inches (13 x 18 cm) | 7:5 | 1.400 |
| 8 x 10 inches (20 x 25 cm) | 5:4 | 1.250 |
| 11 x 14 inches (28 x 36 cm) | 14:11 | 1.273 |
| 16 x 20 inches (40 x 50 cm) | 5:4 | 1.250 |
Practical tips:
- When cropping a photo to a different aspect ratio, you will always lose part of the image. Frame your shots with extra space around the subject to allow for different crops.
- Social media platforms each prefer specific aspect ratios. Instagram feed posts work best at 1:1 or 4:5, while Stories and Reels use 9:16.
- 3:2 is the native ratio of most DSLR and mirrorless cameras, so printing at 4x6 inches requires no cropping.
- When resizing for screens, always maintain the aspect ratio (constrain proportions) to avoid stretching or squishing the image.