Watch the bell curve form in real-time.
A Galton Board demonstrates how random left/right bounces
always create a normal distribution.
1
Hit Drop Ball or press Space to release a ball from the top. It bounces randomly off pegs.
2
Hit Burst x50 or press B to drop 50 balls at once. Watch the histogram grow into a bell curve.
3
Click anywhere on the board to drop a ball at that exact position. Hover over the bins to see counts.
4
Try the Bias slider (right panel) — shift it to 70% and watch the curve lean! More rows = smoother curve.
What is this?
This is a Galton Board (invented 1894). Balls fall through rows of pegs, bouncing randomly left or right at each one.
No matter how many times you run it, the balls always pile up in a bell curve (normal distribution). This is the Central Limit Theorem in action — one of the most important ideas in statistics.
Try this: Drop 200+ balls, then move the Bias slider away from 50%. The curve shifts! This is how unfair coins behave.
Keyboard shortcuts:
Space Drop ball
B Burst x50
R Reset
Esc Close panels
?
What is this?
SaathiAI
Plinko Probability
0
Dropped
0
Landed
—
Peak Bin
—
Std Dev
Distribution
Drop balls to see the bell curve form
Bin 5
12 balls (8.3%)
Controls
Parameters
Rows 12
Ball Size 4
Gravity 1.0
Bias L/R 50%
Display
The Galton Board demonstrates the Central Limit Theorem: random binary choices aggregate into a normal distribution.