Odds explained · odds-against price
+300 odds: payout and meaning
A plus sign means an odds-against price, the kind usually offered on the underdog. +300 means a $100 bet wins $300.00 in profit and returns $400.00 including your stake.
+300 payout chart
| Stake | Profit if it wins | Total payout |
|---|---|---|
| $10 | $30.00 | $40.00 |
| $20 | $60.00 | $80.00 |
| $25 | $75.00 | $100.00 |
| $50 | $150.00 | $200.00 |
| $100 | $300.00 | $400.00 |
| $200 | $600.00 | $800.00 |
| $500 | $1,500.00 | $2,000.00 |
| $1,000 | $3,000.00 | $4,000.00 |
Payout = stake + profit. A losing bet loses the stake; a push (tie, where offered) returns it. In pounds: £100 wins £300.00. Any stake: bet calculator.
How much to bet to win a set amount at +300
| To win (profit) | Stake needed |
|---|---|
| $10 | $3.33 |
| $50 | $16.67 |
| $100 | $33.33 |
| $500 | $166.67 |
Break-even win rate at +300
The implied probability of +300 is about 25.00% (1 ÷ the exact decimal odds, shown rounded). That is the break-even win rate: if you bet this price many times on win-or-lose bets, you need to win more often than that to come out ahead. Whether a +300 bet is good value depends only on whether your honest estimate of the chance beats that number — the EV calculator does the comparison.
+300 in a parlay
Two +300 legs parlayed combine to decimal odds of 16.00 (+1500): a $100 two-leg parlay pays $1,600.00 if both win. Three legs: decimal 64.00 (+6300), paying $6,400.00 on $100. For independent selections from different events, those prices imply a break-even chance of about 1.56% for all three winning — an implied figure that includes each price’s margin, not a forecast; bookmakers may refuse or reprice related selections. Payouts use the exact, unrounded combined odds. Build your own with the parlay calculator.
Compare nearby odds
| Odds | Fractional | Decimal | Implied probability | $100 wins |
|---|---|---|---|---|
| +250 | 5/2 | 3.50 | 28.57% | $250.00 |
| 11/4 | 11/4 | 3.75 | 26.67% | $275.00 |
| +300 | 3/1 | 4.00 | 25.00% | $300.00 |
| 7/2 | 7/2 | 4.50 | 22.22% | $350.00 |
| +400 | 4/1 | 5.00 | 20.00% | $400.00 |
Full betting odds chart → · How betting odds work · 18+ — odds describe a price, not a prediction or a recommendation to bet.