To check or change poster size in PowerPoint, check the Page Setup in the Design ribbon.
These posters were designed in PowerPoint 2013.
30x18 setup size, scale 200% when printing.
36x18 setup size, scale 200% when printing.
Some conferences may specify this size. For most, however, this is likely quite small.
Template for A0 sized poster (84.1 cm X 118.9 cm) commonly used for European conferences. If printing using the library's 36-inch poster paper, the poster will need to be trimmed (or scaled up if the conference allows for larger posters).
For more help see the handout for our class on making posters in PowerPoint: