Bonus Bet Calculator

Work out what a free or bonus bet is really worth, given that the stake is not returned with the winnings.

A bonus bet calculator shows you what a free or bonus bet is truly worth by calculating the real return, which excludes the stake that the bookmaker keeps regardless of the outcome.

What Is a Bonus Bet?

A bonus bet — often called a free bet — is a credit from a bookmaker that you can stake without risking your own money, with a crucial catch: if you win, you receive only the winnings, not the stake itself. Back EUR 50 of your own money at 3.50 and you collect EUR 175.00; use a EUR 50 bonus bet at the same price and you receive only EUR 125.00 because the bookmaker retains the EUR 50 stake. That withholding makes a bonus bet worth noticeably less than its face value.

Bonus bets come in many forms. Some bookmakers award them to new customers, others hand them out after losing streaks, and some issue them as promotional bonuses tied to events. The terms vary sharply — some carry a minimum odds requirement, some exclude certain markets, and most come with an expiry date. But they all share the same basic rule: the stake is not returned on a winning bet. This simple fact transforms how you should evaluate and use a bonus bet. It is not worth EUR 50 in cash; it is worth EUR 50 in Potential winnings, and what comes back depends entirely on the odds you choose.

How a Bonus Bet Is Calculated

The calculation is straightforward but the implications are not. A bonus bet’s return is the bonus amount multiplied by the decimal odds, minus the bonus amount itself — which is the bookmaker’s way of removing the stake. This is different from a cash bet, where you receive the full stake plus winnings. The bookmaker’s retention of the stake is the defining feature of any bonus bet.

Consider a EUR 50 bonus at 3.50. If that were cash, it would return EUR 175.00. As a bonus, it returns EUR 125.00 — exactly EUR 50.00 less, because the bookmaker keeps your stake. This gap is constant: it always equals the bonus amount itself. Yet the percentage impact varies wildly with the odds. At short odds, that gap represents most of your return. At 2.00, your bonus return is EUR 50.00 — meaning you get back only your bonus amount and nothing more, a break-even scenario where no profit is possible. At 3.50, you keep 71.4% of the face value. At 8.00, you keep 87.5%, because the withheld stake now represents a tiny fraction of the total payout.

The share of face value you capture is calculated simply: divide the odds minus one by the odds themselves. This tells you in a single percentage what proportion of the bonus’s value becomes real return. The table below shows this across a range of prices. Short odds extract little value; long odds extract most. This is why bookmakers typically impose minimum odds restrictions on bonus bets — they want you to use the bonus at short prices where the impact of the withheld stake is largest.

What the Calculator Shows You

Enter a bonus amount in euros and the decimal odds, and the calculator returns three key figures. Bonus return is what you get back if you win, which excludes the withheld stake. Cash return shows what a real EUR amount at those same odds would have yielded, making the gap obvious. Value kept expresses as a percentage how much of the bonus’s face value you actually convert to return.

These figures reveal a hard truth: a EUR 50 bonus is not worth EUR 50. How much less it is worth depends entirely on which odds you select. The calculator also handles voided or losing selections, so you can see what happens if the bet does not land or if it is cancelled by the bookmaker.

Worked Example

A EUR 50 bonus bet used at decimal odds of 3.50. If the selection wins, the bonus return is EUR 125.00. A cash bet of the same amount at the same price would have returned EUR 175.00. The difference is EUR 50.00 — the withheld stake. The value kept, expressed as a percentage of the bonus amount, is 71.4% of the face value.

This example illustrates the core principle: a EUR 50 bonus is not worth EUR 50 in real cash value. This is why choosing the odds is not cosmetic. The same EUR 50 bonus at 2.00 odds would return only EUR 50.00 (capturing 50% of face value), while at 8.00 it would return EUR 350.00 (capturing 87.5% of face value). The bonus amount is identical, but the odds determine how much of its value you truly extract and take home.

What a EUR 50 Bonus Bet Returns at Different Prices

The value you capture from a bonus bet scales with the odds. Short prices leave you with little more than your face value; longer prices extract far more of the bonus’s potential.

Why Longer Odds Get More Out of a Bonus Bet

The fundamental reason bonus bets are better value at longer odds is that the withheld stake becomes a smaller fraction of the total return. This truth is worth understanding in depth.

Even Money and the Withheld Stake

At even money — decimal odds of 2.00 — a bonus bet reaches a mathematically peculiar threshold. Your return equals your bonus amount exactly. Stake EUR 50 at 2.00 and you collect EUR 50.00 in return. There is no profit, no loss, and no net gain: you have simply converted your bonus into a cash equivalent of the same size. The bookmaker keeps the EUR 50 stake, you receive EUR 50 in winnings, and the arithmetic is neutral.

This breakeven point is important because many bookmakers impose a minimum odds requirement on bonus bets — often set at 2.00 or higher. Bettors confronted with an approaching expiry date sometimes place a bonus at the minimum odds just to use it up rather than lose it. That impulse is understandable but costly. If the minimum is 2.00, you are accepting a price where you only break even if you win, capturing just 50.0% of the face value. If the bookmaker’s minimum is higher, the value you extract improves significantly. The difference between using a bonus at the minimum and holding it for even slightly better odds is substantial, as the reference table demonstrates.

Bookmakers often use minimum odds to their advantage, structuring them at exactly the point where they cause maximum damage to your expected value from the bonus. Read the full terms before placing the bet. Most bonus offers also restrict certain markets, exclude cash-out options, or impose wagering requirements that must be satisfied before you can withdraw winnings. A bonus bet at 2.00 with two days until expiry might make more sense as part of a hedging strategy than held out indefinitely in hopes of a better price, but only if you have a specific use in mind.

When a Bonus Bet Makes Sense

A bonus bet makes sense only when you have a genuine selection at odds you would accept with your own money, and those odds are favourable enough that the withheld stake does not erase the bonus’s real value. If you would not back the selection at those odds with cash, do not back it with a bonus either. That discipline filters out the temptation that bonus offers create — the urge to chase value by lowering your standards just because you are not risking your own money. A bonus spent on a poor selection is a wasted bonus.

The second critical filter is the odds themselves. Look at the reference table above: at 2.00 you capture only 50.0% of the face value, at 3.50 you capture 71.4%, and at 8.00 you capture 87.5%. This means short prices (2.00 or close to it) are poor uses of a bonus unless you have no alternative and the deadline is approaching. Medium prices like 3.00 to 5.00 extract a reasonable portion of the bonus’s value, making them the sweet spot for most bettors. Long prices — 5.00 and above — recover most of the bonus’s potential, which is why some experienced bettors specifically save their bonus bets for genuinely long-odds selections, even if they would normally avoid such prices.

Bankroll and expiry management matters just as much. Bonus bets all come with expiry dates, sometimes as short as a few days, sometimes a few weeks. Do not hoard them endlessly chasing perfect odds; there is a hard deadline, and an expired bonus is a lost bonus. At the same time, resist the pressure to spend a bonus badly just because the expiry is approaching. If you have a EUR 50 bonus expiring very soon and no selection at acceptable odds, it is better to lose the bonus than to waste it on a weak pick. A EUR 50 bonus used at 3.50 on a selection you genuinely back is far more valuable than the same bonus used at 2.00 on a desperate pick made only because the deadline loomed.

Common Mistakes

Bettors frequently treat a EUR 50 bonus bet as equal to EUR 50 in cash, forgetting that the stake is withheld and the real value is much lower. Many also spend bonus bets at short prices, around 2.00, where half or more of the bonus’s value vanishes immediately. Forgetting the minimum-odds condition is another common error; some bookmakers restrict bonus bets to selections priced above a certain level, and using the bonus at a forbidden price may void it. Finally, many assume that a partial cash-out returns the bonus stake, when in fact the stake is always retained by the bookmaker.

Bonus Bet Against Cash at the Same Price

The difference between a bonus bet and cash becomes stark when you lay them side by side.