Sports Betting Math
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How to Calculate Break-Even Win Rate From Any Odds
Calculate the break-even win rate from American, decimal or casino odds by hand, with formulas, worked examples and a quick-reference table.
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How to Calculate Parlay Odds and Payouts Step by Step
Learn how to calculate parlay odds: convert each leg to decimal, multiply, find the payout, and see why the vig compounds with every leg.
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Expected Value Formula for Gambling: Worked Examples
The expected value formula for gambling, with worked roulette and betting examples, a table of EV by bet, and how EV becomes expected loss.
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Convert American Odds to Decimal and Fractional Odds
How to convert American, decimal and fractional odds, find the implied probability, and see how the bookmaker’s margin shows up in a market.