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OddsKeepr

Odds calculators

Free calculators for fair odds, expected value, parlays, odds conversion and the Kelly criterion. Neutral maths, never tips. The guides explain the ideas behind them.

  • No-vig calculator

    Remove the margin from two-way or three-way prices to see the fair odds, the fair chance of each outcome and the margin.

  • Expected value calculator

    Compare a price with a fair price or your own probability to see the expected value per stake and the edge in percent.

  • Parlay calculator

    Combine 2 to 10 legs in any odds format to see the parlay’s combined odds, payout and profit for a stake.

  • Odds converter

    Convert a price between American, decimal and fractional odds and see the probability it implies, or turn a probability into odds.

  • Kelly criterion calculator

    Work out the Kelly stake for a price and a probability, as a share of a bankroll, with full, half or quarter Kelly.