Twenty-One Dice Game Rules

Updated 4 August 2026 Maintained by Runar

Twenty-One is a dice game for 2-8 players. A game typically takes 10-20 minutes, and the recommended age is 8+.

Rules for Twenty-One: Roll a single die as many times as you dare and get closest to 21 without going over.

This page covers the dice game Twenty-One, not the card game Blackjack, which is also called 21. The card game is at Nordic Card Games.

2-8 players

10-20 minutes

8+ years

1 die

Quick dice games →

Setup

All you need for Twenty-One is a single die, plus a pencil and some paper to keep track of the running total. If the game is going to be played for a pot, put out chips or matchsticks instead.

Anything from 2 to 8 players works. Only one person rolls at a time, and a turn is over in well under a minute, so nobody waits long even in a big group.

Whoever throws the highest number on one die starts, and play carries on clockwise. The aim is to finish as close to 21 as you can without going past it.

How to play

Roll the die and add the pips to a running total that grows with every throw. Keep rolling as long as you like, and stop whenever you please. Whatever total you stop on is your score for the round.

An example: you open with a 4, throw a 6 to reach 10, add a 5 for 15, then take one more roll and get a 3. That puts you on 18, you decide it will do, and the die passes on.

Write the total down as you go. Five throws is plenty to lose count, and a turn that really came to 22 should not be allowed to stand.

Going bust

Any total above 21 is bust. Your turn scores nothing and you take no further part in the round, whatever happens to everyone else.

Working out where the risk begins takes nothing more than addition. A total of 15 or less is completely safe, since even a 6 only brings you to 21. From 16 upwards, some faces ruin the turn:

Total	Faces that bust you	Chance
15 or less	none	0
16	6	1 in 6
17	5 and 6	1 in 3
18	4, 5 and 6	half
19	3, 4, 5 and 6	2 in 3
20	anything but a 1	5 in 6

Land on 21 exactly and there is nothing left to weigh up. Stop there.

Sixteen after three throws is a safe place to stand. Add a 6 and the turn is dead at 22.

Winning the round

Once every player has taken a turn, the highest total that has not gone past 21 wins the round. Stand on 19, and unless somebody gets closer without busting, the round is yours.

If every player busts, nobody wins it and the round is played again.

Players who finish on the same total each roll one die, and the highest number takes the round. Another tie means another roll off.

From one round to a match

A single round can be the whole game, which is often enough for two players.

The usual arrangement is a series where everybody gets to start once. Five players means five rounds, and whoever has won the most of them wins the game. The awkward first turn and the comfortable last one then get shared out evenly.

Agreeing on a fixed number of rounds beforehand does the same job. Five or ten rounds fill a quarter of an hour or so.

Playing for a pot

Twenty-One has a long history as a small stakes game. Chips or a box of matches do the job at home, and the money stays in the drawer when children are playing.

Everybody drops one chip into the pot before the round begins. Go bust and you add a second chip straight away, so pushing too hard has a price. The winner of the round collects the lot.

When nobody survives, the pot stays where it is and the next round is played for both stakes. Two players tied at the top either roll off for the pot or split it between them.

Run out of chips and you are out of the game. Play until one player holds every chip, or until the agreed rounds are done and the biggest pile wins.

The last roller has the edge

Rolling last means knowing exactly what has to be beaten, and pushing only as far as that requires. Catching a total is a good deal easier than defending one:

Total on the table	Chance of getting past it
15 or less	certain
16	95 in 100
17	86 in 100
18	71 in 100
19	52 in 100
20	29 in 100

A first player who stops on 17 will be overtaken by any single opponent 86 times out of 100. With four others still to roll, a total like that is as good as lost. Move the starting player one seat clockwise each round and the advantage travels round the table with them.

Strategy and tips

The safe line is to keep rolling while your total is 15 or less and stop the moment you are past it. Played that way you can never bust. It takes about five throws and averages 17.7.

Over 100 turns the safe line finishes on 16 twenty-nine times, on 17 twenty-four times, on 18 nineteen, on 19 fourteen, on 20 ten and on 21 five. Almost half of all turns therefore end on 16 or 17, which is not much to bring into a round.

Going first, the safe line on its own will not do. Clearing 18 is usually necessary, and that means throwing at least once from a total where a 6 can finish you.

Chasing 21 exactly means rolling on until you either hit it or bust. That comes off 29 times in 100.

Rolling last, the decision makes itself: throw until you are past the leading total, then stop. Land on that total exactly and you may stop and take the roll off instead, which is the better bet on 19 or 20. Against a single opponent the roll off is a coin flip, whereas a 19 that throws again busts two times out of three.

Variants

Common ways to change the game:

Use two dice to speed the turns up. Roll both and add them together, and once you are on 14 or more, switch to a single die for the rest of the turn.
Move the target from 21 to 36. A single die needs roughly twice as many throws to get there, so this version suits two dice better.

For pressing your luck towards a different number, Macao is the closest relative on the site, with 9 as the target and one player acting as banker. Pig puts you in front of the same decision with one die, except there it is the 1s that wipe you out. Ten Thousand lets you bank points along the way rather than chase one particular number.

When should you stop in Twenty-One?

It depends on where you sit in the round. First to roll, you have nothing to go on, and 18 or 19 is a sensible place to stand. High enough that the others have to take a risk, low enough that you get there without busting too often. A total of 16 will be picked off by nearly everyone who rolls after you.

Late in the round the arithmetic is already done for you. If the best total is 18, roll until you are past 18 and stop. If it is 20, only an exact 21 will do, so you keep rolling however uncomfortable it gets.

Is Twenty-One suitable for children?

Yes. Twenty-One is about as simple as dice games get, and one round is enough to learn it. Adding numbers up towards 21 is the only skill involved, so it works from around eight years old. Play for points or for chips with no value when children are at the table.

The mental arithmetic comes free: a child has to hold a total in their head, add the pips on the die and judge whether another throw is safe. Rounds are short enough that nobody gets bored waiting for their turn.

About this version

These rules cover the single die version, where you roll freely until you stop or pass 21, and the closest total takes the round. The chip pot and the series in which every player starts once are both included, along with the two dice variant and the version played to 36. The probabilities in the strategy section are exact calculations.

Do you play with different rules where you live, or did you spot a mistake? Send me an email.

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