Dice Pools: Counting, Keeping, and Comparing Rolls

A dice pool is a group of dice rolled together as part of one procedure. The rules may total every die, count successes, compare faces, keep the highest or lowest results, remove failures, or use symbols. Because these procedures are not interchangeable, a useful dice-pool entry explains both the dice and the way the game interprets them.

Pooling is more than rolling several dice

Rolling 4d6 and adding the four faces is one procedure. Rolling four d6s and counting how many show 5 or 6 is another. Both use four dice, but their outcomes, averages, and success rates differ. The expression alone is not enough; the result rule must be written beside it.

Totals and success counts

For a total pool, record whether all dice are added and whether a modifier applies once or to each die. For a success-count pool, state the success threshold, whether one die can produce more than one success, and what happens to failures. If a game uses degrees of success, keep the threshold and the interpretation visible.

Keep, drop, and compare rules

Some systems keep the highest die, the lowest die, a specified number of dice, or a set of matching faces. Others compare two pools, pair dice, or cancel results. These rules change the probability distribution and should be documented as operations, not compressed into a vague phrase such as “roll a pool.”

When a rule says to reroll, explode, or add an extra die, specify whether the new die joins the pool, replaces an old result, or is treated separately. A cap or a limit on repeated rerolls should also be recorded.

Symbol and narrative pools

Symbol dice can produce outcomes that are not naturally expressed as numbers. A pool may count matching symbols, combine icons, or create a narrative result from a table. The symbol legend is part of the mechanic. Do not infer an outcome from the artwork alone, especially when the same icon could have different meanings in different games.

Pool size and decision-making

Increasing the number of dice can improve the chance of at least one success, but the practical effect depends on the success threshold and on what happens when results conflict. A pool with many dice may create more extreme totals, more matching faces, or more opportunities for complications. Explain the rule’s actual decision point instead of describing a larger pool as simply “better.”

Worked example format

A reproducible entry might say: “Roll four d6s. Each 5 or 6 is one success. Two or more successes is a success; otherwise the action fails.” If the game adds a reroll, a bonus die, or a consequence for zero successes, place that rule directly in the example. This lets readers reproduce the procedure without guessing.

How to catalogue a dice pool

1. State the number and type of dice.
2. Describe modifiers, bonus dice, rerolls, and limits.
3. Explain whether the pool is totaled, counted, compared, or filtered.
4. Define success thresholds, ties, and special symbols.
5. Show a complete example and cite the game’s rules source.

Related DICEWIKI pages

Read dice mechanics, dice modifiers, custom and specialty dice, and dice probability distributions.

Sources and editorial notes

1. D&D Beyond Basic Rules: Playing the Game, for examples of multiple-die expressions, modifiers, and interpretation rules.
2. Fate Core System Reference Document: Fate Dice, for a documented symbol-based dice procedure.
3. DICEWIKI editorial taxonomy, for separating a pool’s dice expression from its interpretation rule.