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.
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.
How we build and check this converter
This converter runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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