Decimal odds work as a gross-return multiplier
With decimal odds, potential gross return is stake × odds. A R$20 stake at 1.80 implies R$36 gross return if the selection wins and is settled as a winner. That includes the original stake.
Source: Betnacional odds explainer.
Convert odds into implied probability
A simple approximation is 1 ÷ decimal odds. Odds of 2.00 imply 50%; 1.50 implies about 66.7%; 3.00 implies about 33.3%. This is the probability embedded in the price before considering bookmaker margin and market structure.
Worked examples
| Stake | Odds | Potential gross return | Implied probability |
|---|---|---|---|
| R$10 | 1.50 | R$15 | 66.7% |
| R$10 | 2.00 | R$20 | 50% |
| R$10 | 3.00 | R$30 | 33.3% |
Odds can change before and during an event
Prices can respond to team news, injuries, weather, market activity and in-play events. The odds you first see are not necessarily the odds available when you confirm the bet.
Compare the same market, not just the biggest number
When comparing prices, make sure the settlement conditions are the same. “To qualify,” “including extra time” and “90 minutes only” can describe materially different bets even when the market names look similar.
Source: Betnacional Market Rules.