How big is 900mm x 600mm?

To calculate the area of a rectangle, you multiply the length by the width. In this case, 900mm x 600mm equals 540,000 square millimeters. To convert this to a more common unit of measurement, you can divide by 1,000,000 to get 0.54 square meters. So, 900mm x 600mm is equivalent to 0.54 square meters.