Probability Wheel for education and demonstration
This spoke is tuned for probability education. Load the 70/30 preset or start from scratch and set weights that match your lesson plan.
Students can see how changing weights shifts outcome frequencies over many spins — making abstract probability concepts concrete.
Add or rename outcomes in the Inputs panel, set a positive weight for each one, and check the live percentage before spinning. You can disable an outcome temporarily without losing its label or weight.
Built for probability learning
Live percentage display makes theoretical probability visible and interactive.
Real-time percentages
Edit a weight and see every percentage recalculate instantly.
Law of large numbers
Spin many times to see results approach the expected probabilities.
Comparison mode
Equalize weights mid-lesson to contrast equal and unequal distributions.
For raffles, giveaways, and contests where fairness matters, we recommend using a standard equal-probability wheel so every participant has the same chance of winning.
Frequently Asked Questions
- What is the Probability Wheel?
- The Probability Wheel is a free online spinner where you assign custom probability weights to each entry. Higher-weight entries are selected more often, making it ideal for probability education, game design, and scenario testing.
- How do I change the probability of an outcome?
- Edit the weight next to each entry in the Inputs panel. The wheel shows the resulting percentage live. Higher weight equals higher probability.
- Are the probabilities transparent?
- Yes. Every entry displays its exact probability percentage so you always know the true odds before you spin.
- Can I reset to equal odds?
- Yes. Click Equalize to set every entry to the same weight, producing a fair equal-probability spin.
- Is this suitable for a fair raffle?
- Weighted wheels are designed for simulations and games, not fair draws. For raffles and giveaways, use the equal-odds main picker wheel so every participant has the same chance.