The Complete Guide to Free Bet Conversion and Matched Betting
A free bet sitting in your sportsbook account is not the same as cash. You cannot withdraw it, and if you simply bet it and lose, it is gone. Matched betting solves that problem by covering every outcome of the same event, so the free bet is converted into real money you can take out. This guide explains the math behind the calculator above, how to read its results, and how to judge whether you are getting a good conversion rate.
How to Use This Free Bet Calculator
Start by entering the Free Bet Amount, which is the face value of the bonus token your sportsbook gave you, such as 100 dollars. Choose the correct bet type with the toggle: Stake Not Returned is the standard free bet, while Stake Returned is a more generous bonus that pays the stake back. Enter the decimal odds you will back your chosen outcome at on Sportsbook A, then the decimal odds on the opposite outcome at Sportsbook B where you place your own cash. Everything updates instantly as you type, with no calculate button to press. The action box tells you exactly how much of your own money to stake and how much profit you will keep.
The Conversion Math, Step by Step
First the engine works out the potential winnings of the free bet. For a Stake Not Returned free bet it multiplies the bonus amount by the odds minus 1, because you keep only the profit. For a Stake Returned bonus it multiplies the bonus amount by the full odds, because the stake comes back too. Next it sizes the hedge by dividing those winnings by the hedge odds, which is the amount of your own cash that makes both outcomes pay the same. Finally it checks the result two ways: profit if the free bet wins equals winnings minus the hedge stake, and profit if the hedge wins equals the hedge payout minus the hedge stake. Because of penny rounding on the hedge stake these two figures can differ by a single cent, so the tool reports the hedge outcome as your official Guaranteed Cash Out.
A Worked Example
Suppose you hold a 100 dollar Stake Not Returned free bet. You back a team at decimal odds of 4.00 on Sportsbook A, and the opposite result is available at 1.33 on Sportsbook B. The free bet winnings come to 300 dollars, which is 100 times 4.00 minus 1. Dividing 300 by 1.33 gives a hedge stake of about 225.56 dollars of your own cash. If the free bet wins you collect 300 dollars and lose the 225.56 hedge, and if the hedge wins you collect about 300 dollars there and the free bet simply expires. Either way you walk away with roughly 74 dollars of pure profit from a free bet that cost you nothing, a conversion rate of about 74 percent.
What Counts as a Good Conversion Rate
For a standard Stake Not Returned free bet, a conversion of 70 to 80 percent is the gold standard. That range means your free bet odds and hedge price are efficient and you are losing very little to the bookmaker margin. Higher free bet odds generally push the conversion up, but they also increase variance because more of the time the hedge is the side that pays. If your conversion drops below about 65 percent, look for higher odds on the free bet or a tighter hedge market. Stake Returned bonuses convert far higher, often well above 90 percent, because the stake itself is part of the return.
Why You Need Two Sportsbooks
The whole method depends on backing opposite outcomes so that one of your two tickets always cashes. Sportsbook A holds the free bet on one result and Sportsbook B holds your cash on the other. Keeping the two bets at separate books lets each stand on its own, which is what guarantees the payout. It also spreads your activity, since sportsbooks watch for customers who only ever bet the value side of a promotion. Always read each promotion's terms first, because minimum odds requirements, market restrictions, and expiry dates all affect whether a free bet can be converted at the rate this calculator shows.