Dice Roller - Roll Any Dice Online

A dice roller is a virtual replacement for physical dice that you can use from a web page instead of carrying a set around. The form takes the number of dice you want to roll in one batch, the number of sides on each die from 2 up to 1000, and an optional seed for reproducible results, then rerenders the roll list, sum, mean, and frequency table every time any value changes.

• • Tabletop RPG combat: Roll a d20 for an attack, a d6 for damage, or a handful of d4s for a fireball without owning the dice.
• • Board game replacements: Replace missing or broken dice for Monopoly, Yahtzee, craps, or any game that asks for 1 to 10 dice at once.
• • Classroom probability: Roll a batch of dice and compare the realized mean to the expected (sides + 1) / 2 to show the law of large numbers in action.
• • Reproducible randomness: Enter a seed to regenerate the exact same roll list when you need to repeat a board game session or a teaching demo.

Each die roll is an independent draw from a discrete uniform distribution with sides equally likely, so a single die has mean (sides + 1) / 2 and the sum of n dice has mean n times that value. The tool pulls one uniform random number per die, scales it into an integer from 1 to sides, and accumulates the batch in the same view.

If you only need the theoretical probability of a particular sum or face, the dice probability calculator handles that without any random draws. This page is the simulation half of that workflow: it actually runs the experiment.

For a focused two-die sum and doubles view, Dice runs a complementary small-batch simulator alongside the multi-die tool on this page.

The tool draws one uniform random number per die and turns it into an integer from 1 to sides using the standard floor-and-add trick. Multiply the uniform draw by sides, drop the fractional part with floor, and add 1 so the result is exactly 1 through sides. Repeat that step n times to produce the full roll list and the running summary.

• n: Number of dice to roll in one batch. Integer from 1 to 50, default 1 in the form.
• sides: Faces on each die. Integer from 2 to 1000, default 6 for a standard cube die.
• seed: Optional integer that seeds a deterministic pseudo-random sequence. Empty or zero falls back to Math.random for a fresh roll each run.

After each roll the value is added to the roll list, the running sum, and the min and max trackers, and the frequency table increments the matching face counter. The mean is computed once at the end as sum divided by n, so it always agrees with the displayed sum and roll count.

According to MDN Web Docs, Math.random, MDN Web Docs explains that Math.random returns a floating-point, pseudo-random number in the range 0 to 1 (inclusive of 0, exclusive of 1), which is exactly the uniform draw the dice roller scales into a face.

If you need the theoretical mean and standard deviation for n dice of m sides without running any rolls, Dice Average Calculator returns the analytic values directly.

Four ideas make the tool behave the way you expect. Each one explains a small piece of how a virtual die turns into a roll list.

The seed concept is borrowed from pseudo-random number generators. Math.random() uses an internal seed that the browser does not expose, which is why two empty-seed runs almost never repeat. Entering an explicit seed overrides that behavior so the dice roller becomes a deterministic simulator you can rewind and replay.

Once the dice roller returns a batch, Dice Calculator can compute the exact probability of any sum or face count from the same dice configuration without re-rolling.

Set the three inputs, then read the roll list, sum, mean, minimum, maximum, and frequency table. The form updates on every input change, so changing the sides or the seed reruns the batch without any extra click.

1. 1 Enter the number of dice: Type the integer number of dice to roll n into the first input. The default 1 is a single die; the form accepts 1 up to 50 dice in one batch.
2. 2 Choose the sides per die: Set sides to 6 for a standard cube die, 20 for a d20, 100 for a percentile die, or any integer from 2 to 1000.
3. 3 Optionally enter a seed: Type any integer into the seed field to reproduce the same roll list on later runs.
4. 4 Read the roll list and sum: The roll list shows each die value in order. The sum below it is the total of all dice in the batch and the mean is the sum divided by the dice count.
5. 5 Inspect the min, max, and frequency table: Use the minimum and maximum to see the spread of the batch, and use the frequency table to count how many times each face landed.
6. 6 Reset for the next roll: Press Reset to clear the form back to n = 1, sides = 6, empty seed and to start a new roll.

If you need a d20 attack roll with advantage, set diceCount = 2 and sides = 20, read the roll list, and pick the higher of the two values. If you need a fireball that rolls 8d6, set diceCount = 8 and sides = 6 and add the eight values from the roll list to the spell's damage bonus.

After the tool returns a realized sum for two dice, Two Dice Probability Calculator can look up the exact probability of that sum and the related doubles distributions.

The form combines a single-die roll, a multi-die batch, an optional seed, and a frequency table in one view, so a single calculation answers the most common dice-rolling questions without extra tools.

• • Any number of sides from one form: Set sides from 2 to 1000 in the same input, so d4, d6, d8, d10, d12, d20, and d100 are all handled without switching pages.
• • Up to 50 dice per batch: Roll a single die for an attack or up to 50 dice for a fireball or horde combat without leaving the form.
• • Reproducible roll lists: The optional seed turns the random batch into a deterministic one. Use the same seed on a second visit and the dice roller reproduces the exact same roll list.
• • Sum, mean, and frequency in one view: Sum, mean, minimum, maximum, and a per-face frequency table appear in the results panel so the realized outcome is readable at a glance.
• • Real-time updates: The form recomputes the roll list on every input change, so adjusting diceCount, sides, or the seed immediately shows the new outcome.

When the realized mean looks unusual, the frequency table lets you check whether one face is dramatically over- or under-represented. Cross-checking the realized mean against the theoretical (sides + 1) / 2 is the fastest way to spot a typo in sides or a bug in the random draw.

If the standard craps-style two-die view with sums and doubles is more useful than the general batch, 2 Dice Roller Calculator presents that exact layout side by side.

The numbers are only as accurate as the assumptions behind each roll. Four practical factors change what the roll list really means and how it should be interpreted.

• • The tool runs in your browser and uses Math.random() by default. Two empty-seed visits will produce different roll lists, and that difference is by design, not a bug.
• • The form caps the batch at 50 dice and 1000 sides to keep the frequency table readable.
• • The tool does not show the underlying uniform draws. If you need to debug an unusual outcome, the seed field lets you reproduce the exact roll list.

Real physical dice can show small biases in practice, so a measured face distribution slightly different from 1 / sides is reasonable for a careful experiment. The form accepts any sides count, which keeps the simulation honest about what the experiment is actually doing.

According to NIST/SEMATECH e-Handbook of Statistical Methods, 1.3.6.4 Discrete Uniform, a discrete uniform distribution assigns equal probability to each of k outcomes, which is the exact model used for a fair n-sided die.

According to Wikipedia, Dice, the standard dice used in tabletop role-playing games are the d4, d6, d8, d10, d12, d20, and d100, which is why the form exposes those numbers as common presets.

For a two-outcome random generator instead of a multi-sided die, Coin Flipper covers the same batch-roll workflow with heads and tails instead of faces.