KEY TAKEAWAYS
A bet-and-get offer is a sportsbook promotion that credits free bets or bonus bets after a customer places a qualifying bet. A typical form is “bet $10, get $50 in bonus bets”. The qualifying bet is an ordinary bet that uses real money. The bonus bets that follow are promotional credit with their own rules, and in most offers they are worth less than the headline figure.
That gap between the headline and the value matters to anyone looking at one of these promotions. The $50 is face value, which is the amount of the bonus bets, not the amount that can be expected to turn into cash. This guide explains how the offer works, which terms shape it, and how to estimate its worth with a fictional example and hypothetical teams. It also shows how minimum odds change the result and gives a checklist for reading an offer. Every offer here is hypothetical, no real sportsbook or promotion is described, and no picks are given.
How a Bet-and-Get Offer Works
The offer has two parts. The first is the qualifying bet, a bet of a stated minimum size, often at odds of a stated minimum. The second is the reward, which is credited as free bets or bonus bets once the qualifying bet is placed or settled. Some offers credit the reward whether the qualifying bet wins or loses, while others credit it only after settlement or only on a loss, so the wording needs to be read closely.
The reward is usually split into several smaller bonus bets rather than one large one. A “$50” reward might arrive as five $10 bonus bets, each usable on its own. Each bonus bet typically has an expiry date, and an unused one is removed when it passes. Many offers also set minimum odds for using the bonus bets, and a few limit which sports or markets qualify.
The key difference from cash is how a winning bonus bet pays. In a stake-not-returned (SNR) bonus bet, a win pays only the profit and the stake itself is not paid back. In a stake-returned (SR) bonus bet, a win pays the stake as well. SNR is much more common. For the full explanation of the two, see the separate guide linked at the end of this article.
Offers also differ on whether winnings from bonus bets can be withdrawn immediately or carry a rollover. Rules vary by sportsbook, offer and state, and the offer’s own terms state them. The math below assumes SNR bonus bets whose winnings are withdrawable without a rollover.
The Terms and the Math
To estimate what an SNR bonus bet is worth, use decimal odds, written D. American odds convert with one rule: +A becomes 1 + A ÷ 100, and −A becomes 1 + 100 ÷ A. A winning SNR bonus bet of size F pays F × (D − 1). The chance of winning at fair odds, meaning odds with no margin, is about 1 ÷ D. Together these give the value.
where: F is the face value of the bonus bet and D is the decimal odds it is placed at. This is a fair-odds estimate, so the sportsbook’s margin makes the real value lower. For an SR bonus bet, the value at fair odds is about F, which is 100% of face value. The qualifying bet also has an expected cost, because every bet carries the sportsbook’s margin.
where: margin is the sportsbook’s built-in edge on the qualifying bet. In a −110 / −110 market, the theoretical margin is 4.55%. This is a simplified estimate. It uses an assumed fair probability, ignores expiry and minimum-odds limits that restrict which bets can be used, and treats results as averages. In practice a bonus bet either wins or loses, and short-run results are variance. Betting is entertainment to be kept within a budget, and an offer is never a reason to bet more.
Worked Example With a Fictional Offer
Suppose Sportsbook A runs a hypothetical offer: bet $10 and receive five $10 bonus bets, credited whether the qualifying bet wins or loses, SNR, with a 7-day expiry. The qualifying bet is on Team A to beat Team B at −110. Assume the player later places the five bonus bets at +200, which is decimal 3.00, and that the true chance of each win is the fair 1 ÷ 3.
Step 1: Convert the qualifying odds. −110 becomes 1 + 100 ÷ 110 ≈ 1.909. Assuming a true 50% chance, the expected value of the $10 stake is 0.5 × 1.909 − 1 ≈ −0.0455 per dollar, which is about −$0.45.
Step 2: Face value = 5 × $10 = $50.
Step 3: SNR value at 3.00 = $50 × (3 − 1) ÷ 3 = $50 × 0.6667 ≈ $33.33.
Step 4: Net value ≈ $33.33 − $0.45 ≈ $32.88.
The result in words: the $50 offer is worth about $32.88 on average, roughly two-thirds of its face value, and this is before the sportsbook’s margin on the odds used. Each $10 bonus bet at +200 pays $20 with about a one-in-three chance and nothing otherwise, so single results vary widely and the average is only a guide.
How Odds Change the Value
The odds at which bonus bets are placed decide most of their value. The table uses the same fictional $50 offer, fair odds, and the $0.45 expected cost of the qualifying bet. These are example terms, not real offers.
| Bonus bet odds (decimal / American) | Share of face value | Value of $50 ($) | Net after $0.45 ($) |
|---|---|---|---|
| 1.50 / −200 | 33.3% | 16.67 | 16.21 |
| 2.00 / +100 | 50% | 25.00 | 24.55 |
| 3.00 / +200 | 66.7% | 33.33 | 32.88 |
| 5.00 / +400 | 80% | 40.00 | 39.55 |
| SR bonus bets, any odds | 100% | 50.00 | 49.55 |
Two points follow. Higher odds keep more of the face value, because a win at longer odds returns a larger share of the stake’s worth. And a minimum-odds rule of 1.50 would restrict the bonus bets to the least valuable row of the table, if the player stayed at the minimum. Variations also exist by product: some offers pay the reward as one large bonus bet, some as several, and some as a cash refund of a losing bet instead of a free bet. Each changes the math in the same way, through settlement type and odds.
Common Catches and Mistakes
The most common misunderstanding is treating face value as cash value. A $50 reward in SNR bonus bets is worth about $33.33 at 3.00 odds under fair odds, and less with margin. Assuming a free bet returns its stake is the next most common error, and it matters because the difference at 3.00 odds is a third of the face value.
A second catch is expiry. Bonus bets that are not used before the expiry date are usually removed, so a plan for using all five needs to fit the window. A third is the minimum odds rule, which can stop a bonus bet from being used on the odds the player prefers. A fourth is confusing the qualifying bet with a bet that cannot lose. The qualifying bet uses real money, can lose, and its stake is not refunded in most offers.
It is also a mistake to think the offer is a reason to place a larger qualifying bet than planned. A larger stake increases the real money at risk and the expected cost. Some offers are limited to one per person or household, and attempts to get around that break the terms and can lead to forfeited bonuses and closed accounts.
Checklist: Reading a Bet-and-Get Offer
Before relying on an offer, find each of these items in its own terms. Each answer changes the value and the way the estimate above is calculated.
To check a calculation, convert the odds to decimal, apply F × (D − 1) ÷ D for each SNR bonus bet, subtract the qualifying stake times the margin, and remember that the result is a simplified average that ignores variance.
Related Concepts and Next Steps
For the settlement types used above, read free bets explained: stake not returned vs. returned. A related promotion whose value also depends on the odds is covered in how odds boosts work and what they’re worth, and the conditions that sit alongside any offer are in how to read bonus terms and conditions. Terms vary between offers, and the offer’s own terms are what count.
Frequently Asked Questions
