Table Games Calculator

Tabletop gamers eventually reach a point at which they recognize their gut instinct around dice probably isnt correct. “I roll more dice, so I get more,” or “I add a flat modifier, so everything move up.” But it’s not like that. A histogram helps make sense of probability by giving it a visual representation. It … Read more

You roll a 1 on your d20 and miss the target. That’s variance. Variances excite players at the table they also infuriate them. How much do things differ? What does that mean about your character? That’s where standard deviation come into play. Standard deviation show you how much variation there is in results. Does everything … Read more

Dice fall with a definitive clack on gaming table. That clatter represents uncertainty, and players often find themselves questioning their luck when things go wrong. Roll for defense, roll for attack, roll for bragging rights. But under the rattle are the gear of mathematics that few player consider unless they’re losing their skins off. Whether … Read more

Rolling two sixes is easy enough to think through, right? Well… not so fast. How do you account for that possibility? It’s got to be two sixes, nothing else… No three, no four. (If it was any number greater than one then we’d just say “two or more.”) That’s important since most of us conflate … Read more

At least initially, it seems counterintuitive to drop highest dice in a pool: after all, most table top mechanics is built around rewarding higher rolls! They’re symbolic of power and success. What you have here is an exercise in reversing that idea and asking yourself what a number represent in the fiction of your game. … Read more

You’ve rolled five dice. Maybe the stakes are only that high in your head. Yet now you require a six. One. And the tension isn’t in watching for whether any particular die will produce it. It’s in watching them all fail to do it together, here is the trap that our intuition betrays us most … Read more

There’s no tool for this that you don’t need because “rolling a 20 on the first try doesn’t feel so bad…until the dungeon master tells me I’ll roll again and it instantly triggers a death trap.” A set of dice are more than just a randomizer; it’s a probability engine with its own curve, and … Read more