Free Bet Converter: How to Turn Bonus Bets Into Cash
SmartStake's free bet converter sizes the hedge that turns a bonus bet into cash, shows the share you lock in, and finds the odds where conversion peaks.
A free bet converter calculates the cash you can lock in from a free bet by placing a matching wager on the other side of the same market. Most US sportsbooks now call the same token a bonus bet, and the math is identical.
It matters because a free bet does not pay like real money. The sportsbook keeps the stake and returns only the winnings, so a $100 free bet is not worth $100 in cash.
The converter below shows how much of that value you can work toward keeping whatever the result, and none of it is risk free or guaranteed.
Try It: Free Bet Converter
Enter your free bet amount, the odds on the free bet, and the odds you can get on the opposite outcome at a second book. Watch the Conversion %: that is the illustrative share of the free bet you lock in as cash.
Free Bet Converter
Total Stake
$142.86
Total Payout
$200.00
Total Profit
$57.14 / 40.0%
Conversion %
57%
Enter your free bet amount and the odds on each side. The Conversion % is the illustrative share of the free bet you lock in as cash whatever the result. It is an estimate, not a prediction, and real outcomes depend on the odds available, sportsbook terms, and user error.
Change both prices together, the way a real market moves. Lengthening only the free bet side while the hedge stays put builds a pair no sportsbook would offer, and the Conversion % runs past what any real market pays.
This is the same math SmartStake ships in the free Free Bet Calculator and in the Promo Converter. The rest of this guide explains where the number comes from.
Why a $100 Free Bet Is Not $100
A free bet is a stake-not-returned credit. When you place it and win, the sportsbook pays your profit but keeps the token itself.
A cash bet of $100 at +100 pays $200 back (your $100 stake plus $100 profit). The same $100 free bet at +100 pays only the $100 profit, because the stake was never yours to get back.
That single rule is why a free bet is worth less than its face value, and why you cannot just bet it and withdraw. You need a way to lock in value no matter which side wins. That is what conversion does.
How Free Bet Conversion Works
Conversion is a two-sided matched bet. You place the free bet on one outcome at one sportsbook, then place a real-money bet (the hedge) on the opposite outcome at a second book.
One side wins and one side loses, but the stakes are set so that either result leaves you with roughly the same cash. The sportsbook sign-up promotions guide shows the same idea behind every promotion in this family.
The hedge bet calculator guide covers hedging outside of promos.
Because the free bet only pays its winnings, you stake less on the hedge than you would to cover a normal bet. What you give up is the two books' combined margin, the hold, charged on the free bet's payout. The low hold betting guide explains how to measure it.
The Formula Behind the Conversion
To lock the same result on both sides, size the hedge so its net payout equals the free bet's net payout. With decimal odds, the hedge stake is:
The free bet term subtracts the stake once, because a free bet is stake-not-returned. A plain cash bet would not subtract it, and a no sweat bet subtracts something different again, which is why they use separate calculators.
The Odds Converter moves prices between American, decimal, and fractional.
The conversion rate is the profit you lock in, divided by the free bet's face value:
A Worked Example
The numbers here are illustrative and can still fall short if odds move or a book limits your bet.
Say you hold a $100 free bet and want to convert it.
- Free bet: $100 on Team A at +200 (3.00 in decimal).
- Hedge: real money on Team B at −250 (1.40 in decimal) at a second book.
Those two prices carry a 4.8% hold. Size the hedge with the formula:
Now check both outcomes:
- Team A wins: the free bet pays $200 profit, and the $142.86 hedge loses. Net: +$57.14.
- Team B wins: the free bet is gone (it was free), and the hedge pays
142.86 × 1.40 − 142.86= $57.14. Net: +$57.14.
Either way you keep about $57.14, so this $100 free bet converts at roughly 57%. With no hold at all, the same +200 free bet would keep $66.67, so the hold costs about $9.52 here.
Picking Odds for a Free Bet
Longer odds on the free bet help, up to a point. A longer price means more of the payout is profit rather than the stake the book keeps. But the hold is charged on the whole payout, and a longer price means a bigger payout and a bigger hedge.
Here is the same $100 free bet across pairs that all sit between a 4.2% and a 4.8% hold, each run through SmartStake's hedge stake function:
| Free bet | Hedge | Hold | Hedge stake | Kept | Share |
|---|---|---|---|---|---|
| +150 | −180 | 4.3% | $96.43 | $53.57 | 53.6% |
| +200 | −250 | 4.8% | $142.86 | $57.14 | 57.1% |
| +300 | −380 | 4.2% | $237.50 | $62.50 | 62.5% |
| +400 | −550 | 4.6% | $338.46 | $61.54 | 61.5% |
| +600 | −900 | 4.3% | $540.00 | $60.00 | 60.0% |
The share climbs, flattens, and falls. With the free bet's decimal odds as O and the pair's hold as h, the conversion rate works out to:
That peaks when O equals one over the square root of the hold. At a 4.5% hold the best price is about 4.71 in decimal, or +371, so +300 to +450 is the range to search.
A tighter hold moves the peak longer and raises it. The same +400 free bet hedged at −500 instead of −550 sits at a 3.3% hold and keeps $66.67. The bet and get guide runs the same table at a 3% hold, where the peak moves out to about +477.
The hedge side is where most of that gap lives, which is why choosing a hedge book with sharp prices, and having more than one book to pair against, matter as much as the free bet price.
A long free bet also needs a big hedge: $540 at +600 for a $100 token, so size it against your bankroll.
Finding the Pair in SmartStake
The calculator sizes a pair you already found. The Premium Promo Converter finds the pair for you: pick your promo book, set the bet type to Free Bet, enter the token's size, and it ranks matched bet cards across your hedge books.
Its Promo Min Odds and Promo Max Odds filters hold the free bet side inside the range above, and Max Bankroll hides pairs whose hedge is bigger than you want to stake.
The sportsbook promo walkthrough shows the full flow from a promotion to both bets placed.
Free Bet vs No Sweat Bet
These two promotions sound alike and convert differently, so it is worth keeping them straight.
A free bet (also called a bonus bet) is the stake-not-returned token this guide covers. You already hold it, and you convert it in one step with the calculator above.
A no sweat bet uses your own real money first. If that first wager loses, the book refunds it as a free bet, which you then convert. That two-step flow needs its own No Sweat Bet Calculator, and the no sweat bet guide walks the whole flow.
Where Free Bets Come From
Most free bets arrive through one of a few promotion types, each converted a little differently:
- Bet and get offers hand you bonus bets after a qualifying wager, and are usually for new customers only. The bet and get guide covers that path.
- Deposit matches credit bonus funds against your deposit, usually with a rollover requirement. See the deposit match guide.
- No sweat bets refund a losing first bet as a free bet, as described above.
Wherever the free bet came from, once it lands in your account the conversion step is the same.
To see which sign-up offers are open in your state or province, the Promo Recommender guide walks through the list, and the Canada matched betting guide covers the Canadian books.
Common Mistakes to Avoid
Conversion is arithmetic, but a few practical errors can eat the value:
- Placing the wrong leg first. Place first the leg you are least sure will be accepted, usually the side where a book might cap your stake, so a rejection never leaves you holding one leg. The tips and tricks guide covers leg order in full.
- Letting odds drift. Prices move fast. If either line changes before both bets are down, re-run the numbers rather than forcing the old stake.
- Ignoring bet limits. A sportsbook may cap the hedge below what you need, and the longer the free bet, the bigger the hedge. Check the maximum on both books before you start.
- Mismatching house rules. A leg that voids while the other stands leaves you one sided. Baseball's pitcher and prop rules are the usual culprit, as the MLB matched betting risk guide shows.
Frequently Asked Questions
What is a free bet converter?
A free bet converter is a calculator that shows how much cash you can lock in from a free bet by hedging it at a second sportsbook. It exists because a free bet returns only its winnings, not its stake, so its cash value is lower than its face value. Most US sportsbooks now call the same token a bonus bet.
How much is a $100 free bet actually worth?
A free bet's cash value depends on the odds you can hedge at, so there is no fixed figure. In the illustrative example above, a $100 free bet at +200 hedged at −250 locks in about $57, and a pair near +300 to +450 with the same hold locks in a little more. Your result depends on the prices available, sportsbook terms, and user error.
What odds should I use for a free bet?
Use a longer price on the free bet, around +300 to +450 at a 4.5% hold, paired with the tightest price you can find on the other side. Past that range the hold on a bigger payout starts to outweigh what the longer price adds. A tighter hold moves the best price longer.
Can you lose money converting a free bet?
You are not staking the free bet itself, but the hedge uses real money, so odds moving mid-conversion, a rejected or limited bet, or a mistake placing the two legs can leave you short. No conversion is risk free or guaranteed.
Is a free bet the same as a no sweat bet?
No. A free bet is a token you already hold and convert in one step. A no sweat bet is real money that becomes a free bet only if your first wager loses, so it takes two steps and its own calculator.
Convert Your Next Free Bet
A free bet is real value, but only once you turn it into cash you can withdraw. Drop your numbers into the free Free Bet Calculator to size the hedge, and let the Promo Converter find the matching bets for you.
To see how SmartStake's promo tools compare with the alternatives, read the best matched betting tools comparison. Bet responsibly, and remember that every promotion can still win or lose.
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