If you make your rolls in the open, consider using jumbo dice — like this 55 millimeter d20. (I’ve only seen d6s and d20s in sizes this large, but I’ve seen slightly smaller versions in d4, d8, d10, d% and d12 as well.) If you’ve got plenty of rolling space, you could even go super-jumbo with a 6″ foam d20, although that seems silly for most applications.

Using bigger dice makes it easier for your players to see what you rolled, and if you’re rolling outside your screen, easier for you to see as well — doubly so if you stand when you’re running combats, like I do.

I’ve had at least one player who really disliked my jumbo d20s, so take this tip with a grain of salt (like all GMing advice!).