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

W H |
= |
W H |

Your aspect ratio is: ? : ?

Example

- Enter the values for the original width (W
_{1}) & original height (H_{1}) on the left. - 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.

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