Landscape Architecture Resource

If you do any international landscape architecture or design work then you should be familiar with both metric and imperial paper sizes. This will come in handy if you are working with consultants overseas or clients outside of North America where metric paper sizes are the standard.

Here is a chart which compares metric and imperial paper sizes.

Wikipedia has everything else you'll ever want to know about paper sizes here, including Japanese, German, and Swedish paper sizes, international standard (ISO) A, B, and C series, American National Standards Institute (ANSI), Architectural paper sizes, and others.