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House Edge Calculator

Enter the win probability and payout to see the house edge and RTP.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

The house edge is the built-in mathematical advantage a casino or bookmaker holds over a player on any given bet, expressed as a percentage of each wager the operator expects to keep over the long run. It's derived directly from the gap between the true odds of an outcome (based on its actual win probability) and the payout odds the house actually offers — the wider that gap, the larger the edge.

This calculator takes a bet's win probability and payout odds and derives three related figures: the house edge, the return to player (RTP) — the inverse of the edge, showing how much of each wagered unit is returned on average — and the expected value (EV) of a single bet. These are standard statistical measures used in probability theory and game analysis to compare the relative cost of different bets or games, independent of any particular outcome.

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