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Dungeons & Dragons

Dice stats

Roll your d20, log each result, and watch the per-number frequency. The diverging bars show how far each face is from the ideal 5%, and the 3D die heat-maps the same data - a quick way to spot a biased die.

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How it works

Dice stats is a roll tracker for spotting a biased die. Record each d20 result as you roll a physical die and the tool builds a live frequency chart plus a 3D heat-mapped die, so you can see at a glance whether a number is coming up more or less often than it should.

Over a fair sample every face should land roughly one time in twenty. Short streaks are normal; bias shows up as a number that stays consistently high or low across many rolls. Your tallies are saved in your browser, so you can keep logging a die across several sessions.

Example. Log 200 rolls of a suspect d20. If 17 and 18 each show up around 25 times while 1 barely appears, the heat map lights up the high faces and you have good evidence the die is weighted.

FAQ

How many rolls do I need to test a die?

The more the better. A few dozen rolls only show rough trends; a few hundred make a genuinely biased face stand out clearly from normal random variation.

Is my data saved?

Yes. Your tallies live in your browser's local storage, so they persist between visits on the same device. Nothing is sent to a server.

Can I track more than one die?

Reset the counts when you switch dice. Each tracked die is a fresh tally, so finish logging one die before starting another.

What are the standard, spindown, and balanced layouts?

They are the three common ways numbers are arranged on a physical d20. Standard is the regular dice layout, spindown runs the numbers in sequence like a Magic life counter, and balanced is the Dice Lab arrangement that spreads values evenly. Pick the one matching your die so the 3D heat map mirrors its real faces.