How do you calculate RTP? We determine the RTP of our games using a mix of mathematical analysis and game simulations. The results of this are used to establish the average return percentage that you see displayed on the games as the RTP. Our games are also verified by NMi, an independent specialist in game testing. We also make our results available to our external auditors and regulators as part of our commitment to game fairness. Related articles Game fairness Where can I find the RTP for a game? I've forgotten my login details How do I choose how much to spend? I don’t want a spending limit... can it be removed?