What's a good bonus bet conversion rate?

A good bonus bet conversion rate is roughly 70 to 80% of face value. A $50 bonus bet converting at 75% turns into about $37.50 in locked-in profit once you hedge it on the other side at another book. Below about 60%, the bonus bet's odds or the hedge price you can find aren't good enough yet, and it's worth waiting for a better pair.

What "conversion rate" means

A bonus bet pays only the winnings; the stake never comes back. Hedging turns that uncertain payout into a certain one: you place the bonus bet on one side and a cash bet on the other side at a different book, sized so you profit the same amount no matter which side wins. The conversion rate is that locked profit divided by the bonus bet's face value.

Placed straight with no hedge, a bonus bet's value depends entirely on chance: it pays big if the pick wins and nothing if it loses. Hedging converts that swing into a fixed, smaller amount you keep either way. Conversion rate is how efficient that trade is.

The math that sets it

Two prices decide the conversion rate: the odds on the bonus bet itself, and the price you can get on the other side to hedge against.

For a bonus bet with decimal payout multiplier d1 (so a $50 bet returns $50 × d1 if it wins), hedged at decimal odds d2 on the other side, the hedge stake is 50 × (d1 − 1) divided by d2. Locked profit is 50 × (d1 − 1) minus that hedge stake, and the conversion rate is locked profit divided by 50.

Two things fall out of that. First, longer bonus-bet odds convert better, because a bigger payout multiplier means more profit to lock in per dollar of stake. Second, for a given bonus-bet price, a better hedge price (less vig on the side you hedge with) converts more of that profit into your pocket instead of losing it to the hedge book's edge.

How the odds alone set a ceiling

If the market on both sides were perfectly fair, with no vig anywhere, the best conversion rate you could ever get at a given bonus-bet price works out to one minus the implied probability of the side you bet. That gives a ceiling for each price:

• +100, fair hedge -100: 50.0% conversion
• +150, fair hedge -150: 60.0% conversion
• +200, fair hedge -200: 66.7% conversion
• +250, fair hedge -250: 71.4% conversion
• +300, fair hedge -300: 75.0% conversion
• +400, fair hedge -400: 80.0% conversion
• +500, fair hedge -500: 83.3% conversion

That's why "bet the underdog side, not the favorite" is the standard advice: at even odds (+100), the best you can ever lock in is half the bonus bet's face value, no matter how good your hedge price is. At +300 or longer, 75% or more is possible even before accounting for real-world vig.

Real hedge prices sit below that ceiling

Actual sportsbooks price both sides of a market with some vig, so the price you hedge at is usually a little worse than the fair number above. Take a $50 bonus bet at +300 (decimal payout 4.00, so $150 in winnings if it hits). The fair hedge is -300, worth 75%; here's what a range of real hedge prices does to that same $50 bonus bet:

• Hedge at -320: hedge stake $114.29, locked profit $35.71, conversion 71.4%
• Hedge at -300 (fair): hedge stake $112.50, locked profit $37.50, conversion 75.0%
• Hedge at -280: hedge stake $110.53, locked profit $39.47, conversion 78.9%
• Hedge at -260: hedge stake $108.33, locked profit $41.67, conversion 83.3%

The bonus-bet odds didn't change across that list, only the hedge price did. That's the case for line shopping before you hedge: at -320 you keep 71.4% of face value, and at -260 you keep 83.3%, from the exact same $50 bonus bet.

Why short odds don't get there

Shopping for a better hedge price only moves the number so far. A $50 bonus bet at +150 (decimal payout 2.50) hedged at -150 converts at 60%; even an unusually generous -140 hedge only pushes it to 62.5%. Compare that with +300 at a mediocre -320 hedge, which still converts at 71.4%. The odds on the bonus-bet leg matter more than the hedge price does, which is why +250 or longer is a reasonable floor to look for before bothering to hedge at all, and why a conversion below 60% usually means the odds were too short rather than the hedge price too soft.

Putting it together

1. Look for a bonus bet on a side priced at +250 or longer. Shorter than that caps your conversion no matter what hedge you find.
2. Shop for the best price on the other side across books you use; a few cents of price is most of the gap between a 71% and an 83% conversion.
3. Run both prices through the bonus bet converter to get the exact hedge stake and locked profit before you place anything.
4. Place both legs quickly. Prices move, and a stale hedge price throws the math off.

A bonus bet is single-leg math like this. If you're weighing a profit boost on a parlay instead, the breakeven percentage rises with every leg for a different reason: it's the parlay's own vig compounding, not a hedge price. Bonus bets show up inside several other promo types too, from deposit matches to bet-and-gets; this conversion math is what each one is really worth once you look past the sticker number.

Read your book's current terms before you bet: minimum odds, expiry, and eligible markets vary by offer and by book. Betting is for adults 21+ where legal, with money you can afford to lose.