A simple tool to calculate aspect ratios for images.
Use the form below to calculate the missing value for a particular aspect ratio. This is useful, for example, when resizing photos or video.
Select a preset Use the preset selector to choose a standard aspect ratio, or leave it on "Custom" for manual input.
Enter original width and height These represent the base dimensions of your image or video.
Enter either width or height The tool will compute the other dimension to maintain the selected aspect ratio.
Enable rounding (optional) Check the "Round results to the nearest whole number" box if you want all dimensions to be rounded.