What does 25 graham wafers crushed equal in cups?

Approximately 25 graham wafers crushed yield about 1 to 1.5 cups of crumbs, depending on how finely they are crushed. Typically, one standard graham cracker is about 1/4 cup when crushed, so this can vary slightly based on the brand and size of the wafers. For precise measurements in recipes, it's always best to measure the crumbs after crushing.