Casino bonuses look like free money, but their true value is decided by one number: the wagering requirement (turnover). As a data person, I refuse to evaluate a bonus without doing the math. Here is how to compute what a bonus is actually worth.
The core formula
Every bonus has three numbers:
- Bonus amount (e.g., 100 baht free)
- Wagering requirement (e.g., 20x)
- Game weight (what percentage of each bet counts — slots usually 100%, table games sometimes only 10%)
The total amount you must wager before withdrawing winnings is:
total_wager = (deposit + bonus) × wagering
For a 100 baht deposit + 100 baht bonus with 20x wagering:
total_wager = (100 + 100) × 20 = 4,000 baht
Now compute expected cost
This is where most players lose. If you wager 4,000 baht on a slot with 96% RTP, your expected loss on that turnover is:
expected_loss = 4,000 × (1 − 0.96) = 160 baht
Your bonus was 100 baht, but clearing it costs 160 baht in expected loss. This bonus is mathematically negative — you are paying to take it.
The no-wagering exception
A no-wagering bonus (no turnover requirement) flips the math entirely. You get the bonus, play it, and whatever remains is withdrawable. The expected value becomes:
EV = bonus × RTP
For a 100 baht no-wagering bonus at 96% RTP: expected value = 96 baht. That is genuinely free money with no strings. This is why no-wagering promotions are the most valuable offers available.
Comparison table
| Bonus type | Wager | Expected cost (96% RTP) | Verdict |
|---|---|---|---|
| 100 + 100, 20x | 4,000 | −160 baht | Negative, skip |
| 100 free, 10x winnings | depends | varies | Usually negative |
| 100 free, no wagering | 0 | +96 baht | Positive, take it |
| Cashback 5% on losses | 0 | +small | Positive if you play anyway |
Practical rules
- Always convert wagering requirements to expected cost before clicking "claim."
- Check the max bet during wagering — exceeding it voids the bonus.
- Check game eligibility — some games contribute 0% to turnover.
- Read the expiry — a 24-hour expiry makes a "generous" bonus nearly impossible to clear.
The takeaway
Bonuses are not free money — they are structured bets. Compute the expected cost, compare offers like you would compare interest rates, and only take the ones that are positive EV. A bonus with 0 wagering is the only kind that is unambiguously good.
Originally published on PGSLOTWEB.
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