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Random Decision Wheel Spinner
Spin a custom wheel to make unbiased decisions, pick raffle winners, or select random team members with angular deceleration physics.
Rotational Kinematics & Angular Deceleration Physics
Fair wheel selection relies on uniform angular probability density and cubic deceleration curves. The continuous rotational trajectory is evaluated against discrete angular sectors:
1. Uniform Discrete Sector Probability:
P(i) = 1 / N (Each of N choices occupies an arc of exactly 2π / N radians)
2. Cubic Ease-Out Deceleration Function:
θ(t) = θ_start + Δθ × [1 - (1 - t)^3] (where t ∈ [0, 1] is normalized elapsed time)
3. Pointer Index Derivation:
Winner_index = ⌊ (2π - (θ_final mod 2π) + 3π/2) mod 2π / (2π / N) ⌋
5 Fatal Traps in Random Decision Wheels & Raffles
1. The Visual Pointer vs Index Disalignment Trap
Calculating the winning index from the rotation angle without accounting for the pointer's physical placement. On a standard clock face, a top pointer sits at 270 degrees (3π/2 rad); forgetting this offset declares the opposite slice the winner.
2. The Truncated Arc Overcrowding Trap
Adding 60+ names to a small 300px canvas without font scaling. Tiny text slices overlap into unreadable black wedges, preventing visual verification of winner boundaries.
3. The Linear Velocity Abrupt Stop Trap
Stopping the wheel abruptly without ease-out deceleration physics. Natural friction follows quadratic or cubic decay; instant stops feel rigged and artificial to participants.
4. The Duplicate Choice Weighting Distortion
Pasting the same option multiple times without realizing that duplicate items multiply its probability proportionally ($k / N$).
5. The Re-spin Tampering Temptation Trap
Spinning a second time when an unfavorable choice is selected. Decision wheels only provide psychological clarity if the user commits to honoring the initial outcome.
Frequently Asked Questions
How does the decision wheel select a winner?
The spinner applies rotational physics with cubic ease-out angular deceleration. When the wheel comes to a complete rest, the exact slice directly beneath the red pointer is mathematically calculated and announced.
Is the wheel spin truly fair and unbiased?
Yes. The rotation arc and random revolutions are generated using unbiased random seeding, ensuring every segment has an identical mathematical probability P = 1 / N of being selected.
How many custom options can I add to the wheel?
You can add anywhere from 2 to 50+ choices in the text box. The wheel automatically subdivides the 360-degree circumference into equal angular slices with distinct colors.
Can I copy the winning selection to my clipboard?
Yes! As soon as a winner is chosen, click "Copy Winner" to copy the result along with an audit timestamp.
Is my custom choice list saved when I close the browser?
Yes. Your custom list of choices is preserved in your browser's private local storage so your options are ready whenever you return.
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