**Instructions:** Enter the values for the original width (W_{1}) & original height (H_{1}) on the left, then enter either a new width (W_{2}) or new height (H_{2}) on the right to calculate the remaining value.

Change any of the values at any time, or reset them to the starting values.

W H |
= |
W H |

Your aspect ratio is: 4 : 3

Example

Use the form at left to calculate the missing value for a particular aspect ratio. This is useful, for example, when resizing photos or video.

Say you have a photo that is 1600 x 1200 pixels, but your blog only has space for a photo 400 pixels wide. To find the new height of your photo—while preserving the aspect ratio—you would need to do the following calculation:

original height / original width x new width = new height

1200 / 1600 x 400 = 300