Image layout - size calculator

I’m not sure if there is a word for this type of image layout, but it’s pretty common - one large image to the left, with two smaller images tiled vertically to the right, like an old window.

I needed to show a client some different options for image sizes, so I put this calculator together quickly to show some examples.

Containing rectangle

680px x 390px

Large left image

336px x 390px

Small right images

336px x 191px

Placeholder image 336 x  390
Placeholder image 336 x  191
Placeholder image 336 x  191