Decimal odds: return and profit
Decimal odds include the return of the original stake. Gross return is calculated as stake × decimal odds. Profit is gross return minus the original stake.
| Stake | Decimal odds | Gross return | Profit |
|---|---|---|---|
| R$10 | 1.80 | R$18 | R$8 |
| R$20 | 2.50 | R$50 | R$30 |
| R$50 | 3.20 | R$160 | R$110 |
Convert decimal odds to implied probability
Implied probability is approximately 1 ÷ decimal odds. Odds of 2.00 imply 50%; 4.00 imply 25%; 1.50 imply about 66.67%.
Implied probability is not “true probability”
The calculation converts a price into a probability-like percentage. It does not prove the actual chance of the event, and bookmaker margin means the implied probabilities across all outcomes can sum to more than 100%.
Worked overround example
Suppose a two-outcome market prices both sides at 1.91. Each side implies about 52.36%. Added together, that is about 104.72%, leaving roughly 4.72 percentage points above 100%. This simplified excess is commonly used to illustrate bookmaker margin/overround.
Why odds move
Prices can change as the operator updates information, exposure and market conditions. A move does not guarantee that one side has become the “correct” bet.
Current availability is separate from the math
The arithmetic is evergreen. Whether a sportsbook can currently offer bets is jurisdiction-specific; Brazil currently prohibits fixed-odds betting under MP 1.394/2026.
Brazil-specific current regulatory status. Source: Brazil Ministry of Finance — MP 1.394/2026