Spin the Wheel – Random Wheel Spinner
Enter your options one per line, tweak the order and spin settings, and spin the wheel to draw a truly random winner. Repeat entries to weight them, remove winners between spins, and keep a log of the last 20 results.
Customize the Wheel and Draw a Random Winner
Spin the Wheel Formula
Where:
- \(n\) — total number of entries (slices) on the wheel
- \(k\) — how many slices carry the entry you are interested in (1 if the entry appears once)
- \(P(\text{win})\) — the probability that this entry is drawn in a single spin
The formula expresses the chance of each entry: a wheel always lands on exactly one slice, and the spinner draws the winning slice uniformly, so an entry appearing \(k\) times among \(n\) slices wins with probability \(k/n\).
Spin the Wheel – Calculation Example
Example: the default wheel holds six entries — Pizza, Sushi, Tacos, Burgers, Salad and Pasta — and you want to know the chance of landing on Tacos, which appears once.
\[ P(\text{Tacos}) = \frac{k}{n} = \frac{1}{6} \approx 0.1667 \]
\[ P(\text{Tacos}) = \frac{1}{6} \times 100\% \approx 16.67\% \]
Result: each entry on this six-slice wheel has a 16.67% chance of winning, and Tacos is drawn roughly once every 6 spins on average. If you added “Tacos” a second time, its share would double to \(2/6 \approx 33.33\%\).
How to Use the Calculator
- Type your options into the Wheel entries box, one entry per line (2 to 100 entries). To give an option better odds, simply repeat it on extra lines — each repetition adds a matching slice.
- Choose a Wheel order: keep the list as entered, shuffle the slices each spin, or sort them alphabetically in either direction. This only affects how the slices are arranged, never the fairness of the draw.
- Set the Spin duration between 3 and 5 seconds; this changes the length of the animation only.
- Tick Remove winner after the spin if you want each winner taken off the wheel before the next draw — handy for giveaways where prizes must not repeat. The entry list under Entries in play always reflects the current set.
- Toggle Toggle to spin again (or change any other option) to trigger a fresh spin. The Winner panel shows the drawn entry with its exact probability, and Last 20 winners keeps a running history of your draws.
What Is a Spin-the-Wheel Random Picker?
A spin-the-wheel picker is the digital version of the classic carnival prize wheel: you fill a circular wheel with options — team names, student names, dinner ideas, prize categories, chores — and spin it to select one at random. The slice that stops under the pointer at the top is the winner. It turns an arbitrary decision into a visual, fair, and entertaining random draw.
Beneath the animation, the fairness of a wheel comes down to one number: the chance that any given slice lands under the pointer. With \(n\) equal slices, each slice wins with probability \(1/n\); an entry listed \(k\) times wins with probability \(k/n\). This spinner draws the winner before the animation starts, using the browser’s cryptographic random number generator with rejection sampling to eliminate modulo bias, then rotates the wheel so that the winning slice stops exactly under the pointer. The result is visually dramatic but mathematically equivalent to drawing a name from a well-shuffled hat.
Read the Winner panel carefully for weighted entries: it shows both the chance of the specific winning slice (\(100/n\)% with \(n\) entries in play) and the overall probability of the winning label accounting for duplicates. So if “Pizza” fills 2 of 6 slices, its overall chance is 33.33% even though each individual slice contributes only 16.67%.
Useful companion tools: for a simple binary decision, try the Coin Flip calculator or the Yes or No Wheel; for draws with more structure, see the Dice Roller or the Lottery Odds Calculator.
Assumptions, Limitations and Practical Tips
- Equal-sized slices. Every entry produces exactly one full slice, so a 10-entry wheel gives each entry an equal 10% share. Fairness comes from equal slices plus a uniform random draw — not from the length of the spin.
- Weighting by repetition. There is no separate “weight” field; write an option three times and it occupies three slices. If you need precise custom ratios, count your lines carefully: probabilities are always \(k/n\).
- Winner removal is one-way during a session. When Remove winner after the spin is on, each winner is dropped from Entries in play (but never below 2 entries). Your original text box keeps the full list; copy the lines from Entries in play back into the box if you want the wheel and the text to match.
- One spin per change. A spin is triggered whenever an option changes — including the toggle box. If nothing changed, the last result is kept rather than drawing again accidentally.
- Labels get shortened on crowded wheels. With many entries, long labels are truncated on the wheel graphic (hover a slice to see the full text), so keep entries short and distinguishable when you have 30+ options.
- Animation vs. result. The spin duration (3–5 s) is purely cosmetic. People who prefer less motion can rely on the result panel — the outcome is decided the instant the spin starts.
- Independent draws. With winner removal off, every spin is an independent event with identical probabilities — past winners do not affect the next draw. If fairness without repetition matters (raffles, assignments), leave removal on so no entry can win twice.
Quick Probability Reference
The single-slice winning chance depends only on how many entries are on the wheel:
| Entries | Chance per entry | Average spins until a win |
|---|---|---|
| 2 | 50.00% | 1 in 2 |
| 4 | 25.00% | 1 in 4 |
| 6 | 16.67% | 1 in 6 |
| 10 | 10.00% | 1 in 10 |
| 20 | 5.00% | 1 in 20 |
| 50 | 2.00% | 1 in 50 |
| 100 | 1.00% | 1 in 100 |
Duplicate entries add their slices together: an entry repeated \(k\) times on an \(n\)-entry wheel wins \(k\) times more often than a single entry does.
Frequently Asked Questions
Is the spin-the-wheel picker truly random, or can it be rigged?
The draw is genuinely random. The winner is chosen first, using the browser's cryptographic random number generator with rejection sampling to avoid modulo bias, and the wheel animation then parks exactly that slice under the pointer. The spin duration, order, and animation length have no influence on the outcome — it is mathematically the same as pulling one name from a well-shuffled hat.
How do I give one option higher chances of winning?
There is no weight field — you weight by repetition. Type an entry on several lines and it occupies several slices. On a 10-entry wheel, an entry written twice fills 2 of 10 slices, so it wins with probability \(2/10 = 20\%\), while single entries win \(1/10 = 10\%\) of the time. Count your lines carefully if you need exact ratios.
How many entries can the wheel hold?
Anything from 2 to 100 entries, one per line. Blank lines are ignored automatically. With more than about 30 entries the labels get shortened on the graphic, so keep them short and distinct — you can hover a slice to see the full text. For very large draws (raffles with hundreds of names), consider splitting into several rounds instead.
What happens when 'Remove winner after the spin' is on?
Each winner is dropped from the entries in play before the next spin, so it cannot win twice in the same session — ideal for giveaways or assigning tasks without repeats. The wheel never drops below 2 entries. Note that your original text box keeps the full list; to restore a removed entry, copy the lines from 'Entries in play' back into the box.
How do I calculate the winning probability by hand?
Count your total slices \(n\) (including duplicates) and the number of slices \(k\) that carry the entry you care about. The probability is \(P = k/n\). Example: a 12-entry wheel where 'Anna' appears twice gives \(2/12 \approx 16.67\%\). On average she wins about once every 6 spins, though any single spin is independent.
Does a previous result affect the next spin?
Only if winner removal is switched on. With removal off, every spin is an independent event with identical probabilities — past winners do not become more or less likely (there is no 'hot slice' effect). With removal on, each drawn entry leaves the wheel, so the remaining entries' probabilities rise: their shares are recalculated over the current number of entries in play.
Can I use this wheel for a fair giveaway or raffle drawing?
Yes, thanks to the cryptographic random draw each entry gets exactly its mathematical share \(k/n\). For a transparent giveaway, list participants one per line, enable winner removal, and take a screenshot of the winner and the running history of the last 20 draws. For large public contests, be aware that a third party cannot easily audit a browser-based draw — keep your entry list published beforehand.