Step-by-step instructions
Enter labels and positive weights
Use option | weight on each line. A weight describes the option’s share relative to the total.
Check the weight totals
Use consistent units such as entry counts or percentage values. Combine records that should represent one option.
Draw a single option
Select Pick an option. Save the result before another draw; remove an option manually when later draws must exclude it.
Worked example
Option A has weight 6 while B and C have weight 2 each. The total is 10.
One valid result is shown below. Your generated outcome will vary.
Example input
Option A | 6 Option B | 2 Option C | 2
Example result
1. Option A
A has a 60% intended share, while B and C have 20% each. Comparing only A to B would miss C’s contribution to the total.
Calculate the share from all entries
A weight twice as large as one other weight is twice as likely as that specific option, not necessarily more than 50% likely overall. Divide the option’s weight by the sum of every eligible weight. Use consistent units and label the rule before drawing so the weights are an agreed input rather than a change made after an unwanted result.
Settings and limits to check
The example has 3 retained entries. At least two entries are needed. Weights must be positive finite numbers no greater than 1,000,000,000 each. An option’s theoretical share is its weight divided by the sum of all weights; values need not sum to 100. Each generation selects one option and keeps the original choices for the next draw. Zero-weight choices should be left out.
Settings used in this example
Remove duplicate entries: Off
Keep a usable copy of the result
Use Copy to place the current result in your own notes, or Download to keep a text file. Keep the eligible input list with the result when you need to explain which entries took part. A new generation replaces the displayed result rather than adding to a saved history.
The tool runs in your browser and does not upload your input. Save the result before refreshing or leaving the page. If other people need to use the same outcome, share your saved copy rather than asking them to generate another independent result.
Frequently asked questions
If A weighs twice as much as B, is A’s chance always two thirds?
Only if A and B are the entire pool. Additional options also contribute to the total.
Must my weights add to 100?
No. Only relative weights matter. Values 3, 2, 1 produce the same relative shares as 30, 20, 10.
Can a chosen option win again?
Yes. Each click starts another draw from the current list. Remove previous winners yourself when repeat winners are disallowed.
What should I check in the worked example?
A has a 60% intended share, while B and C have 20% each. Comparing only A to B would miss C’s contribution to the total.