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EVERYDAY TOOLS

Aspect Ratio & Resolution Calculator

Find the height for a new width while preserving the original image or screen aspect ratio.

Enable JavaScript to use the interactive tool. Instructions and examples are available below.

A LITTLE GUIDANCE

Aspect Ratio & Resolution Calculator guide

Calculate proportional dimensions before resizing an image or layout.

How to use

  1. Enter the original width and height.
  2. Enter the new width you want.
  3. Read the matching height, scale and original ratio.

Worked example

Input
Resize a 1920×1080 ratio to a width of 1280.
Result
The matching size is 1280×720, with an original aspect ratio of 16:9.

Common questions

Does this tool resize the image file?

No. It calculates dimensions. Use the image resizer tool to convert an actual image file.

What should I do with a fractional result?

Round to the pixel rules of your final output. Rounding to whole pixels can introduce a small ratio difference.