Roulette Tool

Randomly select using a roulette wheel. Input up to 300 items in table or text format, and adjust probability by setting ratios for each item. Choose from 3 color palettes and enjoy with animations and sounds.

Candidate Input

Item name
Weight (Number)

Color Palette

Roulette

Please enter items

Usage and specifications

How to use this tool

Enter candidate names and weights in the table or text input, then spin. A larger weight gives an option a higher selection probability.

Understanding the result

Probability is each weight divided by the total. Equal weights give equal chances. Add up to 300 candidates and adjust colors or sound.

When to use it

Choose a lunch option, a game prompt or a practice topic for an informal activity.

Practical tips

With weights A=1 and B=3, the chances are 25% and 75% on each spin. Four spins do not guarantee one A and three Bs.

Worked examples

Convert weights to probabilities

Input / settingsResult
A: weight 1; B: weight 3
A has 25% and B has 75% on each spin

Specifications and limitations

  • Random selection uses Math.random. It is not intended for monetary or prize draws, audited selection or cryptography.
  • In text input, commas and tabs separate names from weights, so avoid them within candidate names.
  • Animation and volume settings do not increase an option’s probability.