American odds
- -145 means you need to bet 100, in addition to getting back your $145 wager.
- +125 means you will win an additional 100, for a total payout of $225.
British (Fractional) Odds
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With fractional odds, the ratio is equivalent to your potential payout (the numerator) and your wager (the denominator), and then reduced to the smallest version of that fraction. At 5/8 odds, you could win 8 that you bet.
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Admittedly, it’s much easier to calculate your potential winnings with British odds than American odds. If you bet 160 * (5/8) = $100.
European (Decimal) Odds
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They include the return of your wager in the representation.
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1.625 odds means that a bet of 160 * 1.625 = 260 - 100.