Chance Wheel — probability made visual
The Chance Wheel makes probability tangible. Assign weights, then spin many times to observe how frequently each outcome actually occurs.
Great for introducing the concept of chance in primary and secondary education, or for adding weighted randomness to board game prototypes.
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.
Explore chance with visual feedback
Spinning many times shows how theoretical probability and actual results compare.
Visual probability
Sector sizes reflect weights so you can see differences at a glance.
Classroom experiments
Compare predicted vs actual frequencies across spin runs.
Board game prototyping
Test weighted event triggers for game mechanics quickly.
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 Chance Wheel?
- The Chance 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.