This tool is used for a specific roulette system where a player bets on every number that comes up until a repeat number hits.

For example:

number 3 hits: bet 1 unit on number 3
number 10 hits: bet 1 unit on numbers 3 and 10
number 15 hits: bet 1 unit on numbers 3, 10, 15
number 3 hits: Win and reset all bets.
        

This calculator will determine how much to bet in order to get the minimum bet amount.