Impostor Odds Calculator – Among Us

The calculator uses combinatorial probability and binomial distribution models to determine your likelihood of getting specific roles. The fundamental probability of drawing an Impostor on any single round is determined by dividing the number of active impostors by the total number of players in the lobby. For multi-match sessions, the tool computes the expected mean temperature (expected value) as n × p, where n is the total number of games and p is the single-game probability. Furthermore, it calculates the variance (n × p × (1 - p)) and standard deviation to show the statistical spread of your outcomes over time.

Imagine you join a lobby with 10 total players, and the host has configured the match to have 2 Impostors. For any given round, your baseline probability of being selected as an Impostor is 2 divided by 10, which equals 0.20 or 20%. If you play a session consisting of n = 25 games, the expected mean number of times you will play as an Impostor is 25 × 0.20 = 5 times. The variance evaluates to 25 × 0.20 × 0.80 = 4, yielding a standard deviation of the square root of 4, which is 2. This means while 5 is your expected average, falling between 3 and 7 impostor games is statistically very common.

To get the most accurate insights from this tool, make sure your lobby size and impostor settings reflect the actual game configurations you play with. Keep a running tally of your roles over a session of at least 15 to 20 matches to notice meaningful statistical trends rather than short-term anomalies. Remember that due to true randomness, individual game draws are independent events, meaning streaks of crewmate or impostor roles are completely normal over time.