Define the outcomes
Give every outcome a clear label. Equal weights mean equal chances; a weight of two receives twice the probability of a weight of one.
An easy pick, with clear chances
Spin a choice. See the odds.
Define the outcomes. Inspect their weights. Run a selection, then take your questions into the probability lab.
Saved on this browser
Click the wheel to choose an entry
Make a choice. Explore its chances.
Start with a visual picker, then investigate what its outcomes mean. Build independent wheels for combinations or open the probability lab to compare theory with simulated trials.
Open probability lab · Compare predicted joint probabilities with repeated trials and export the observed counts.
Set up your next spin
- Paste one entry per line and review the list
- Choose colors, sounds and spin duration in settings
- Click the wheel or press Space when the wheel is focused
- Keep the result, remove it or spin again
Separate prediction from observation
A short run may look uneven even when the picker is fair. Use the probability lab to compare theoretical joint probabilities with observed trial frequencies.
Explore independent combinations
Multiple wheels choose independently. For a specified combination, multiply the component probabilities; repeated simulations can illustrate how frequencies settle over time.
Save and share with care
Wheels save in this browser when local storage is available. Export a JSON backup before clearing browser data. Share links include the entries in their URL: anyone with the link can read them.
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