Total: The sum of all dice rolled — in tabletop RPGs this is typically the number you compare against a target (difficulty class, armor class, damage threshold, etc.).
Average: The mean of the individual rolls. Over many rolls, your average should approach (sides + 1) ÷ 2 per die — for example, 3.5 for a D6.
Min / Max possible: The theoretical floor and ceiling for this dice combination. Min is always the number of dice (all 1s); max is dice × sides (all max rolls).
How This Calculator Works
You choose how many dice to roll (1–20) and the number of sides per die. Each die is simulated with Math.random(), which produces a uniformly distributed integer from 1 to the number of sides. The tool displays each individual roll, then computes the total, average, and the possible range for your dice pool.
Quick Questions
Is this truly random?
The roller uses the browser's built-in pseudorandom number generator (Math.random), which is more than adequate for games and casual use. It is not cryptographically secure, so it should not be used for gambling or security-sensitive purposes.
What dice are used in Dungeons & Dragons?
D&D uses a standard set of polyhedral dice: D4, D6, D8, D10, D12, and D20. The D20 is rolled most often for attack rolls and ability checks. D100 (percentile) is used for certain random tables.
What is the expected total for 2D6?
The expected (average) total for 2D6 is 7. Each D6 has an expected value of 3.5, and 3.5 + 3.5 = 7. This is why 7 is the most common result when rolling two six-sided dice.
Can I roll more than 20 dice?
This tool caps at 20 dice per roll for display clarity. If you need larger pools, you can roll multiple times and add the totals manually.
Sources
Wikipedia — Dice (history, types, and probability distributions of polyhedral dice)
AnyDice (advanced dice probability calculator for comparing distributions)