D4 roller
One four-sided die, ready to roll.
Roll to draw new faces. Nothing is chosen yet.
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Recent rolls
Rolls you make in this visit show up here.
Each tap is a new pseudorandom draw via crypto.getRandomValues. Not atmospheric noise. How the draw works
About this page
A d4 is the tetrahedron people use when a tabletop rule asks for a small spread: one through four. This page opens with one die and four faces already filled in. Press Roll and you get a single integer in that span. You can raise the dice count if a rule wants 2d4, or change the faces if you landed here by habit and actually needed a d6. Four outcomes means each face is 25 percent on a fair mapping. The expected value is 2.5, so a long series should sit near the middle rather than cling to 4. The page does not start with a face showing. Until you roll, there is no result to argue about.
Related
Questions
When is a d4 the right die?
Use it when the written rule says d4, or when you genuinely have four equally good options and you want them numbered. It is a poor stand-in for a coin, which has two outcomes, and a poor stand-in for a d6. If you are numbering four people, you can also put their names on the wheel so nobody has to remember who is number 3.
What numbers can appear?
1, 2, 3, and 4. Zero is not a face on this preset. If a game numbers a d4 from 0 to 3, subtract one after you roll, and say that you did. The roller will not silently renumber itself. Adding a second d4 sums two independent draws, so 2 and 8 are rarer than 5.
How often should I see a 4?
About one roll in four, over a long run. In ten rolls you might see none, or you might see several. Each roll is chosen when you press the button. Animation only reveals that draw. The browser uses crypto.getRandomValues and rejection sampling, which the methodology page spells out. This is not a loaded die, and it is not atmospheric noise. A short game is not a large enough sample to prove the die is 'hot.'
Is a d4 the same as picking 1–4 on the number page?
The sample space is the same: four inclusive integers. The d4 page shows a die face and lets you add more dice of that size. The number page is plainer and can draw several independent integers without summing them. Pick the picture that matches the rule you are following.
Can I mix a d4 with other dice?
Not on this preset. Open the tabletop tray, set the d4 count, and set the other dice you need. The tray adds an optional modifier. This d4 page stays a single face count so the probability talk stays simple.
Does the shape of a real tetrahedron matter here?
Only as background. A physical d4 is awkward to read because it lands with a point up, and some sets print the number on the vertex rather than the face. This page prints the integer that was drawn. It does not model bounce, table friction, or which vertex is up. Treat it as a fair four-outcome picker with die notation.
What should the table agree before the first d4 roll?
Name the question, agree that one roll counts, and decide whether a disputed read gets a reroll. ChanceKit will not replay the number after a refresh. If a physical tetrahedron is hard to read, this page is the substitute, not a second opinion you consult until the face looks friendly. Four outcomes is a small space, so repeats show up quickly. That is the math of a d4, not a signal to switch dice in the middle of a count.