Free Single Bet Calculator: Explicit and Clear Information About How Amounts Are Defined for Co-Favourites and Runners Commonly Engaged in This Race Before Winners Are Withdrawn free bet calculator single Introduction to the Single Bet Calculator A free single bet calculator tool is provided to help bettors determine precisely how much they might win on one bet. By filling in the wager size and odds, bettors get an exact figure of potential returns with this tool. Explaining How a Single Bet Calculator Works The method is easy to follow. You enter the amount you want to wager, often called the stake or unit, and the odds of the runner you want to bet on.