From board games to d20s
Two six-sided dice cover most family board games — and their totals aren't uniform: 7 is six times likelier than 2 or 12, the fact hiding under every Catan board. The polyhedral set (d4, d8, d10, d12, d20) is tabletop RPG territory, where the d20 decides whether your rogue picks the lock or the guard notices. This roller treats every side with exactly equal probability, which physical dice — with their drilled pips and worn corners — only approximate.
Classroom-fair rolls
For probability lessons, roll a large batch and tally: the results converge on theory fast enough to watch. Because rolls use cryptographic randomness and happen in front of the class, there's no "the dice are loaded" argument — a quietly useful property for deciding who presents first.
Frequently asked questions
Are online dice as fair as real dice?
Fairer, usually — machined dice carry tiny biases from drilled pips and rounded edges, while this roller gives each side mathematically equal probability from the browser's crypto random source.
Why is 7 the most common total with two dice?
Six of the 36 possible combinations sum to 7 (1+6, 2+5, 3+4 and their mirrors) versus a single combination for 2 or 12. The bell-shaped spread of two-dice totals is the first probability lesson most people ever get.
Can I roll D&D-style notation like 3d6?
Set dice to 3 and sides to 6 — that's 3d6. The total is shown automatically; add your modifier mentally or roll the d20 first for the check itself.
Do my rolls get stored anywhere?
No — rolls happen in your browser and vanish when you leave. There's no history, no account, and no way for anyone (including us) to see them.