Second Chance Bonus EV Calculator

Why a second-chance offer needs a conditional model

A second-chance promotion does not simply give you two rewards. You attempt the cash stage first. If that stage reaches its target, the offer ends on the successful cash path. If the cash bankroll fails before the target is reached, the fallback reward is triggered.

That makes the fallback value conditional. A £25 bonus that triggers in only part of the simulations is not worth £25 on every attempt. Its contribution depends on how often the first stage fails and what the fallback itself is worth after wagering.

Model the initial cash attempt

The cash stage uses the deposit, game, RTP, stake and cash target profit. The target is measured against the starting cash. If the cash balance reaches that target, the fallback is not used. If the balance can no longer fund the stake first, the second chance is triggered.

Changing the stake can therefore affect more than the expected loss per bet. It can alter how frequently the cash path reaches the target before busting, which in turn changes how often the fallback is received.

Fallback bonus or free spins

The second chance can be modelled as bonus funds or free spins. A bonus can have its own wagering requirement and, if needed, its own game, RTP, stake and volatility. Free spins have their own spin count, stake, RTP and optional wagering of winnings.

This separation matters when, for example, the initial cash attempt is on a high-RTP table game but the fallback bonus must be played on slots. Using one RTP for both stages would overstate the value of the fallback.

Worked second-chance example: why simple addition fails

Imagine a £50 cash attempt with a target of £20 profit. If the cash attempt busts, the promotion gives a £25 bonus that must be wagered. It would be wrong to calculate “cash EV + £25”, because the £25 is received only on the bust path and it has its own wagering cost.

The probability of triggering the fallback depends on the cash game's outcome distribution, stake and target. The fallback contribution then depends on its own game and wagering. Because those pieces are path-dependent, the current calculator intentionally does not present a Mathematical EV for Second Chance. Simulated EV is the appropriate figure.

Reproducible simulator result

This example is generated by the current engine using 100,000 simulations, fixed seed 20261010, on 10 October 2026.

The two contribution figures show why simply adding £25 to the cash-stage EV is wrong. The fallback triggers in only about 35% of trials, and some triggered bonuses then bust during their own wagering. Mathematical EV is intentionally unavailable for this path-dependent setup.

The fallback slot stage uses the simulator's generic Medium-volatility payout table rather than data from a particular slot. A normal live run uses a fresh random seed.

Open this calculator Enter the published settings above to compare a fresh live run.

What to look at in the results

Start with Simulated EV, then check how the offer gets there. A high trigger rate means the fallback is doing a large part of the work. A high reward-bust rate can show that the nominal fallback looks attractive but often disappears during its wagering stage. Average wagering and time help distinguish a compact offer from one that ties up far more play for similar EV.

The important comparison is not “which offer has the largest fallback?” but “which complete decision tree has the best expected result under realistic assumptions?”