Ratio calculator
Calculate and resize proportions
No image selected
Image and video dimensions
Aspect Ratio Calculator
Simplify any width and height, calculate a missing dimension, compare common ratios, and estimate the largest centred crop without distortion.
Simplified ratio16:9
Decimal ratio1.7778
OrientationLandscape
Resized dimensions1280 × 720 px
Largest centred crop1920 × 1080 px
Area cropped0.0%
Processed locally in this browser; the file is never uploaded.
Visual ratio
Target frame preview
16:9
Ratio reference
Common aspect ratios and uses
| Ratio | Common dimensions | Typical use |
|---|---|---|
| 1:1 | 1080 × 1080 | Square posts and profile images |
| 4:5 | 1080 × 1350 | Portrait social posts |
| 16:9 | 1920 × 1080 | Widescreen video and thumbnails |
| 9:16 | 1080 × 1920 | Stories, reels and vertical video |
| 3:2 | 3000 × 2000 | Camera photos and prints |
Aspect ratio FAQ
How do I calculate height from width?
Choose the target ratio, select that you know the width, and enter it. Height equals width multiplied by the ratio height divided by ratio width.
What is 1920 × 1080 as a ratio?
It simplifies to 16:9, with a decimal ratio of about 1.7778.
Does resizing change the aspect ratio?
It does not when both dimensions are calculated from the same ratio. Entering unrelated width and height values can stretch the image.
Are uploaded images stored?
No. Image dimensions are detected locally in your browser and the file is not uploaded.