Roll a d4

The odds on a d4

A single die is flat: no total is more likely than any other. The curve only appears once you roll more than one, which is what the 2d4 page is for.

Lowest

1

Highest

4

Average

2.50

Each face

25.0%

Odds

1 in 4

Every bar the same height. That flatness is the whole point of a single die: 25.0% per face, no favourites.

What a d4 is for

Damage from daggers and darts, and the smallest healing dice in the game.

Hitting a target number

What a flat d4 beats, and how much two-dice advantage moves it.

How to use this roller

Tap the die or press the roll button. To roll several at once, change How many. To add a bonus, put it in Modifier: entering 3 turns a d4 into 1d4+3. Negative numbers work for penalties. The keyboard shortcut is R.

Nothing is stored on a server and no account is needed. The page works offline once loaded, which matters if the venue has poor signal.

Common questions about the d4

What are the odds of rolling a 4 on a d4?

Exactly 25.0%, or 1 in 4. Every face on a fair d4 is equally likely, so a 4 is no rarer than a 7.

What is the average roll on a d4?

2.5. That is the midpoint of 1 and 4, and it is worth knowing because the average of a die is always (sides + 1) divided by 2. Over many rolls your results converge on it, but any single roll tells you nothing.

Does rolling with advantage change the odds of a 4?

Advantage is a d20 mechanic, but the maths applies to any die. Rolling two d4 and keeping the higher would raise your chance of a 4 from 25.0% to 43.8%.

Is this d4 roller actually random?

Every roll comes from the Web Crypto API rather than Math.random, and uses rejection sampling to discard values that would skew the result. A plain modulo of a random number is biased when the range does not divide evenly, which for a d4 would quietly favour the low faces.

Other dice