Dice Roller — Roll Dice Online
Roll up to 12 dice from d4 to d100, see the total instantly, and read the exact probability of what you just rolled — computed from the real distribution, not an estimate. Advantage mode included for d20 games.
What is the Dice Roller?
This is a free online dice roller for every standard polyhedral die — d4, d6, d8, d10, d12, d20 and d100. Pick a die, choose how many (up to twelve), and roll: every die is an independent uniform draw, the digital equivalent of a perfectly balanced die with no memory of previous throws. The total appears in large type, the last ten rolls stay in the history so nobody has to remember who rolled what, and a single-d20 setup unlocks the advantage/disadvantage toggle used by modern tabletop role-playing games.
What makes this roller different from a plain random-number widget is the line under the total: after every roll it computes the exact probability of the total you got, from the true distribution of your dice combination. Roll 7 on two d6 and it reads 16.67% — because exactly 6 of the 36 equally likely outcomes sum to 7. Roll 12 and it reads 2.78%, one outcome in thirty-six. The tool is honest about how lucky you just were, which turns an ordinary dice roll into a small probability lesson.
How to Use It
The Mathematics of Dice
One die is flat: every face has the same chance, and a d20 is exactly as likely to land on 20 as on 1. The moment a second die joins, the totals stop being flat, because middle sums can be made more ways than extreme ones. Two d6 make 7 six different ways but 12 only one way, so 7 is six times as likely. Add more dice and the histogram of totals climbs toward the familiar bell shape — with five d6, totals near 17 and 18 dominate while 5 and 30 are one-in-7,776 events.
The probability line under each roll is computed by convolution — combining the distribution of each added die one at a time until the tool holds the exact count of ways to reach every possible total. Nothing is simulated or approximated. Advantage works differently: rolling two d20 and keeping the higher pushes the average from 10.5 up to about 13.8, and makes a natural 20 nearly twice as likely (9.75% instead of 5%) — which is exactly why the mechanic feels so strong at the table.
Dice Roller Tips & Uses
A dice roller in the browser earns its keep anywhere physical dice are missing, loud, or easy to knock off the table.
Board games without the box
Two d6 replaces the dice from almost every classic board game — and the roll history settles "wait, what did you roll?" arguments before they start. Five d6 covers Yahtzee-style games; try vygam's own Yatzy and Farkle if the dice mood strikes.
Tabletop RPG sessions
d20 for checks with the advantage toggle, d4 through d12 for damage, d100 for percentile tables. The crossed-out discarded die means the whole table sees both d20s — no trust issues about which number was kept.
Teaching probability
The exact-probability line makes this a classroom tool: have students predict which total is most likely with three dice, roll twenty times, and compare the tally against the printed percentages. The bell curve stops being abstract the moment it shows up in their own rolls.
Quick decisions and randomizers
Assign options to numbers and let one die decide — or use a d100 as an instant percentage oracle. For choices with names attached, the Spin the Wheel picker does the same job with labels instead of numbers.
FAQ
Is this dice roller free?
Yes — the dice roller on vygam is completely free, with no download, no sign-up and no limit on rolls. Pick your dice and roll as often as you like.
Which dice can I roll?
All seven standard polyhedral dice: d4, d6, d8, d10, d12, d20 and d100 (percentile). You can roll up to twelve dice of one type at a time — enough for any board game, RPG damage roll or classroom exercise.
Are the rolls actually random?
Yes. Every die is an independent uniform draw, so each face has exactly the same chance on every roll — the digital equivalent of a perfectly balanced die. There are no streaks built in and no memory of previous rolls.
What does the probability line mean?
After each roll the tool computes the exact mathematical chance of the total you rolled, using the real distribution of your dice combination — not an approximation. Rolling 7 on two d6 shows 16.67%, because 6 of the 36 possible outcomes sum to 7.
What is advantage and disadvantage?
A d20 convention from tabletop role-playing games: with advantage you roll two d20 and keep the higher; with disadvantage you keep the lower. The toggle appears when a single d20 is selected, and the discarded die is shown crossed out.
Why is two dice more likely to roll 7 than 12?
Because more combinations add up to 7. Two d6 can make 7 six different ways (1+6, 2+5, 3+4, 4+3, 5+2, 6+1) but 12 only one way (6+6). That is why the distribution of several dice forms a bell shape with middle totals most common.
Can I use it for board games like Monopoly or Yahtzee-style games?
Yes — two d6 covers most classic board games, and five d6 covers Yahtzee-style dice games. The roll history keeps the last ten results so nobody has to remember who rolled what.