Diceの使い方
Roll up to 10 six-sided dice simultaneously to generate random numbers.
What is Dice?
Dice rolls 1 to 10 six-sided dice at once and shows individual values plus the total. Useful for TRPG damage rolls, board game substitutes, probability demonstrations, and anything needing quick random numbers on a phone. Only six-sided dice (d6) are supported — d4, d8, d20, etc. are out of scope.
使い方の手順
Choose how many dice
Drag the slider to set the count between 1 and 10. Use 2d6 for TRPG, 1–2 dice for most board games, or 10 dice if you're illustrating probability convergence in a classroom.
Roll
Tap "Roll". All dice spin independently for about two seconds. The animation shows faces changing in real time so it feels closer to a physical roll than an instant number.
Read individual values and total
Each die face is displayed large, with the total shown in the corner. Use individual values for checks like snake eyes; use the total for damage or score calculations.
Check the history
The last 10 rolls are kept at the bottom of the screen. Good for "wait, what did I roll?" moments. History clears when you close the browser — screenshot important rolls.
A concrete scenario
5th grade math class demonstrating the law of large numbers
Situation
The teacher wants students to feel that "a single die is unpredictable, but 100 rolls smooth out" — and 100 physical rolls won't fit in class time.
How it played out
Project Decidable on the board with 10 dice selected. "Each roll counts as 10 trials". Roll 10 times in a row and have students tally face counts. Initially the distribution is lumpy; after 100 trials each face approaches 15–20 occurrences. The "law of large numbers" becomes something students saw, not just a phrase in a textbook.
ヒントとコツ
- Total is computed automatically — no manual addition
- Ten dice produce totals between 10 and 60, averaging 35
- Probability of matching dice drops sharply with count (three sixes ≈ 0.46%)
- Probability distribution matches a physical d6 exactly (1/6 each)
こんな時に便利
Common mistakes to avoid
- 1Expecting d4, d8, or d20 — this tool only supports six-sided dice.
- 2Assuming repeated matching rolls means the tool is broken — independent trials can produce surprising streaks (three sixes in one throw is about 0.46%).
- 3Reading only the total and missing special combinations like snake eyes.
- 4Closing the browser without screenshotting history — rolls are not persisted.