Useful Utilities

Decision Wheel

Spin a wheel of up to twelve options: weights bend the slices, printed chances match, and a seed replays one landing.

Fill in the values and calculate

Options, one per line*Up to twelve lines
Weights, one per lineOptional. Leave blank and every slice counts as 1Default
Spin seed0 lets the pointer land fresh on each visit; any other seed replays the same landingDefault 0

The form sends itself back to this page — results print below, computed on the server.

No results yet: fill the form above and press Calculate.

About Decision Wheel

The wheel is drawn here in plain SVG, with no canvas and no images: each slice's angle is its weight divided by the total weight, so a weight of 3 covers three times as much wheel as a weight of 1.

The landing is drawn from the same weights: a uniform spin is dropped into the cumulative slice angles, which is exactly the same as spinning a physically fair wheel. The printed chances are the slice sizes.

Questions about Decision Wheel

How do weights change the odds?

An option's chance is its weight divided by the total weight. The table prints that percentage for every option, so you can see the trade-off before you spin.

Can I replay a spin?

Fill in the seed field. The same options, weights and seed land in the same place, which makes a disputed spin provable.

Is there a limit on options?

Twelve options. Past that the slices and their labels stop being readable, and very thin slices lose their label (the table still lists every option).

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