Calculate image dimensions by aspect ratio
Choose an aspect ratio and calculate matching image dimensions.Free to use in your browser, with no sign-in.
How to calculate image dimensions by aspect ratio
1. Choose an aspect ratio
Choose a ratio such as 4:5 or 16:9, or enter a custom ratio.
2. Enter a width or height
Enter one side in pixels. The other side updates to match the ratio.
3. Copy the dimensions
Check the resolution in megapixels, then click Copy dimensions.
FAQ
Choose a ratio, then enter a width or height. The other side updates to match, and the result shows the total resolution in megapixels.
1:1 suits profile images and grids. 4:5 suits portrait social posts, 16:9 suits slides and video thumbnails, and 9:16 suits stories and full-screen mobile images.
Yes. Choose Custom ratio and enter each side as a whole number from 1 to 100.
Pixels must be whole numbers, so the calculated side is rounded. Some sizes cannot match a ratio exactly.
A megapixel is one million pixels. Multiply width by height, then divide by one million to get the total.
Each side can be up to 8192 px.
Enter the dimensions in the image resizer. Turn off Keep aspect ratio to set both values independently. The result must stay within 24 million pixels in total.
No. All image tools are free to use, with no sign-in.
