Explore the Plinko Probability: Galton Board
Drop balls through pegs and watch the bell-shaped binomial distribution build, with the theory curve. Free, no signup, runs in your browser.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
Illustration. Open the tool for the real thing.
See it in action
The Plinko Probability: Galton Board with sample data entered and the result showing.
What is the Plinko Probability: Galton Board?
Drop balls through pegs and watch the bell-shaped binomial distribution build, with the theory curve. It runs in your browser, so a change to a setting or a drag on an object shows up at once.
The same maths underlies polling, quality control, insurance and the spread of test scores.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
Each peg is a 50/50 (or biased) choice.
Many random choices make a bell curve.
Mean = rows × probability.
Drop 50 balls at once.
Bias the chance to 0.8.
Add more rows.
Used for
Pick one to see how it fits.
Math learners
Algebra, geometry, trigonometry and calculus students, teachers preparing demonstrations, and self-learners who want to see the maths move.
Try it freeTeachers
For teachers: project the Plinko Probability: Galton Board on the board, let students predict the result, then run it together and test this: Bias the chance to 0.8. For students: change one thing at a time and write down what changes.
Try it freeHow it compares
A plain look at this tool next to the usual alternative.
| This simulation | Textbook diagram | |
|---|---|---|
| Interactive | Drag, tap and change settings | Fixed picture |
| Install | Nothing to install | Not needed |
| Cost | Free to use | Depends on the book |
Questions people ask
What is a Galton board?
A board with rows of pegs where balls bounce left or right at random, showing the binomial distribution.
Why does a bell curve appear?
There are many more ways to reach the middle bins than the edge bins.
Is the Plinko Probability: Galton Board free to use?
Yes. The Plinko Probability: Galton Board is free, needs no signup or download and runs in your web browser. It is part of the Math group of AZRS simulations.
Does the Plinko Probability: Galton Board work on a phone or tablet?
Yes. The Plinko Probability: Galton Board takes touch input as well as mouse input, so you can use its 7 adjustable settings with a finger. A larger screen makes the controls and graphs easier to read.
How do I use the Plinko Probability: Galton Board?
1. In the Plinko Probability: Galton Board, use the controls to change Rows of pegs, Chance of going right, Ball speed, Chart, Theory curve, and more. The simulation reacts instantly. 2. In the Plinko Probability: Galton Board, pick an option such as Counts, Percent, Cumulative, Binomial + normal to switch modes or load an example. 3. In the Plinko Probability: Galton Board, press "Drop 1", "Drop 10", "Drop 100", "Restore pegs" to start, reset or change what is happening. 4. Start with this experiment: Drop 50 balls at once. Drag any glowing handle, object or slider with your mouse or finger and the Plinko Probability: Galton Board responds in real time. 5. Change one setting at a time and watch which readout moves, then compare it with this idea: Each peg is a 50/50 (or biased) choice.
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Try the Plinko Probability: Galton Board now
Drop balls through pegs and watch the bell-shaped binomial distribution build, with the. Free to use.
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