ABOUT THIS TOOL
Find the shape of an image or video from its dimensions. Choose a preset or custom ratio to calculate a matching width or height.
How it works
Enter your dimensions. Type the width and height in Identify a ratio to see their ratio and decimal value.
Choose a target shape. Select a preset such as 16:9, 9:16 or 1:1. Choose Custom to use the ratio from your entered dimensions.
Calculate the matching size. Change either width or height in Calculate a matching size. The other dimension updates to preserve the selected ratio, rounded to a whole pixel.
Formats and useful details
Input
Numeric width and height in pixels. No image or video upload is needed.
Output
An identified ratio, decimal ratio, calculated dimensions and common resolution examples.
Good to know
Presets include 16:9, 9:16, 4:3, 1:1, 21:9 and 3:2, plus Custom. The calculator supplies dimensions; it does not crop or resize a media file.
Frequently asked questions
What aspect ratio is 1920 × 1080?
1920 × 1080 simplifies to 16:9. Other exact 16:9 sizes include 1280 × 720 and 3840 × 2160.
How do I calculate a missing height?
Choose the target ratio and enter the width in Calculate a matching size. For 16:9, a width of 1280 gives a height of 720. The calculator rounds results to whole pixels.
Does this tool change my image or video?
No. It calculates dimensions from numbers. Use Image Converter to resize an image, or apply the calculated dimensions in your video editor.
