Which Metric paper size provides the largest drawing area?

The largest drawing area among the Metric paper sizes is provided by A0. The A-series paper sizes follow a consistent scaling system, where each size is half the area of the preceding size. A0 is defined to have an area of 1 square meter, which makes it the largest size in the A-series.

When comparing A0 to the other options, A1 has half the area of A0, A3 has a quarter of the area, and A4 has one-sixteenth. As a result, A0 not only has a larger surface area but also allows for more extensive and detailed drawings, making it particularly useful for architects and engineers who need enough space for comprehensive designs and layouts.