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Decimal odds are expressed as a decimal number and represent the prize return for every $1 wagered. The payout for decimal odds is calculated by multiplying the odds by the bet amount.

For example, a $10 bet on a selection with odds of 2.50 would return a payout of $25 ($10 x 2.5 = $25). When calculating the payout, the calculation includes the original wager amount. In the example above, the $25 payout includes the $10 wager, so the profit is $15.

Decimal odds for an outcome are the equivalent to the decimal value of the fractional odds when divided, plus one. Even odds (1/1) are quoted in decimal odds as 2.00. This is calculated as:
(1/1) +1 = 2 or 2.00

Decimal odds for an outcome where the fractional odds are stated at 4/1 would be calculated as:
(4/1) + 1 = 5 or 5.00

Decimal odds for an outcome where the fractional odds are stated at 1/4 would be calculated as:
(1/4) + 1 = 1.25