Flat betting
Wagering the same amount every spin. The baseline every progression is compared against.
In context
Expected lossmathExpected lossExpected value times total amount wagered; the average amount lost over a session or a period.Read full → is simply stake × spins / 37, fixed in advance. Every progressionstrategyProgressionAny rule that changes the stake based on previous results. Negative progressions raise it after losses, positive after wins.Read full → wagers more on average and loses more on average.
Simulations on this site show flat even-money betting ends about 42% of 100-spin sessions ahead, which is better than most progressions’ mean and worse than MartingalestrategyMartingaleProgression that doubles the bet after each loss. See the Strategy section for what it does and does not do.Read full →’s median.