These unit sizes determine how much of the bankroll size you will use and how long the bankroll will last based on the roulette probability calculator. Many recommend not using more than 5% of the bankroll size. If the bankroll size is £500 then, a safe unit will be 1% of the amount thus £5, a recommended unit will be 2% which is £10 and a high-risk unit will be 4% thus £20.

The calculator provides the safe unit (highest odds), the recommended unit (true odds), and a high-risk (lowest odds) unit which are all percentages of the bankroll size the player can wager. To use the calculator, a player simply inputs the bankroll size in the required section and clicks to calculate the different odds. The base unit is a fixed amount that will be constantly wagered for every ball spin allowing us to determine the best online roulette odds. The bankroll size is the total amount roulette players are willing to use in a single session. The calculator works by determining the most suitable base unit based on the bankroll size for the payout odds. This helps to maximize the amount of time to play roulette table and to keep composure even during a winning or a losing streak.