The Grosvenor Casinos Poker Calculator works by using what’s known as a “Monte Carlo” algorithm. This algorithm estimates the percentage of making a hand in Texas Hold’em by simulating what would or could happen had the hand been played out multiple times. The calculator runs all the possible outcomes of the hand from the point at which the player is on the board until it hits a limit of 12,500 simulations.
To ensure a perfectly accurate percentage each time, one would need to run hundreds of thousands of simulations, which would cause the calculator to run much slower – especially where there are no board cards. Instead, we have chosen to impose a limit of 12,500 possible outcomes, which means the calculator is within 1.5% accuracy of the displayed percentages. For calculations that have less than 12,500 outcomes (when the hand progresses further) the calculation is more accurate. To ensure the tool calculates hand percentages as quickly as possible, the calculations run on a separate server – as opposed to the individual’s computer.