Standard paper and poster sizes to guide your design | Pogo Design
Printful - New poster sizes are up! Square posters (12"x12", 16"x16"), as well as our smallest ever size yet (8"x10"). Check 'em all out: https://www.theprintful.com/product/posters | Facebook
Standard Poster Sizes - Printingcenterusa
Standard Poster Sizes: From Letter Size to Billboard | Renderforest
Standard poster size & poster dimensions | Rush Flyer Printing