Wagering Requirements Math: Real Worked Examples
A bonus is only worth what its terms allow you to keep, and the math is simple once you know the four numbers: what the multiplier applies to, the multiplier itself, the game weighting, and the game's house edge. Multiply the applicable amount by the multiplier to get total wagering; divide by the game weighting to get the real amount you must bet on your chosen game; then multiply that by the house edge to estimate the expected loss of clearing it. A "bigger" bonus with a high multiplier and low weighting can cost more than it gives. Bonuses do not beat the house edge — they change the odds at the margin. Gambling carries real financial risk, is age-restricted (18+), and may be illegal where you live, so check local law first.
What four numbers decide a bonus's real value?
The wagering base, the multiplier, the game weighting, and the house edge.
Casino bonus terms can read like a wall of fine print, but almost all of the value hinges on four figures. Pull these out first and the rest of the offer becomes easy to evaluate. Our broader walkthrough of terms lives in crypto casino bonuses explained; this article focuses purely on running the numbers.
- Wagering base: what the multiplier is applied to — bonus only, or deposit + bonus (stricter).
- Multiplier: how many times that base you must wager, e.g. 30x, 40x.
- Game weighting: the percentage of each dollar wagered on a game that counts toward the requirement.
- House edge: the built-in advantage of the game you clear the bonus on, which sets your expected loss.
How do I compute total wagering?
Multiply the wagering base by the multiplier — mind whether the deposit is included.
Start with the headline. Suppose a "100% up to $100" bonus gives you a $100 bonus on a $100 deposit, with a 40x wagering requirement. The critical question is what the 40x applies to.
Identify the base
Bonus-only: $100. Deposit + bonus: $200. Read the terms carefully — this doubles the work in this example.
Apply the multiplier
Bonus-only at 40x = $4,000 to wager. Deposit + bonus at 40x = $8,000 to wager.
Adjust for weighting
Divide by the game weighting to get the real bet volume on your chosen game.
How does game weighting change the real bet volume?
Divide required wagering by the weighting; a 20% game means five times the volume.
Game weighting is where offers quietly get harder. If slots count 100% but blackjack counts 10%, then only ten cents of every dollar wagered on blackjack chips away at the requirement. To find how much you must actually bet on a given game, divide the total wagering by that game's weighting. Using the bonus-only $4,000 requirement above:
- Slots at 100%: $4,000 ÷ 1.00 = $4,000 of real betting.
- Video poker at 20%: $4,000 ÷ 0.20 = $20,000 of real betting.
- Table game at 10%: $4,000 ÷ 0.10 = $40,000 of real betting.
The same "40x" requirement quietly becomes ten times larger on a 10%-weighted game. This is why the weighting table matters as much as the multiplier.
What is the expected cost of clearing a bonus?
Multiply the real bet volume by the game's house edge to estimate expected loss.
Every dollar you wager gives back, on average, one minus the house edge. So the expected cost of grinding through a requirement is the real bet volume multiplied by the house edge. This is a statistical average, not a guarantee — variance means your actual result can be far better or worse — but it tells you whether an offer is structurally worth taking. The worked table below assumes the bonus-only $100 at 40x, cleared on games of different weighting and edge.
| Scenario | Total wagering | Weighting | Real bet volume | House edge | Expected loss | Net vs $100 bonus |
|---|---|---|---|---|---|---|
| Low-edge slot | $4,000 | 100% | $4,000 | 1.5% | ~$60 | +$40 |
| Typical slot | $4,000 | 100% | $4,000 | 3% | ~$120 | −$20 |
| High-edge slot | $4,000 | 100% | $4,000 | 5% | ~$200 | −$100 |
| Table game | $4,000 | 10% | $40,000 | 1% | ~$400 | −$300 |
Read the last column carefully. Only the low-edge slot has a positive expected value here; the typical slot roughly breaks even, and the low-weighted table game is a clear loss despite its tiny house edge, because the weighting forces enormous bet volume. The lesson: weighting can outweigh edge entirely.
Many bonuses cap how much you can withdraw from winnings — for example, "max cashout 5x bonus." Even a mathematically favourable grind is capped by that ceiling, so factor it in. A small cap can erase the edge you calculated above.
A quick formula you can reuse
Expected loss = (base × multiplier ÷ weighting) × house edge.
Commit this one line to memory and you can screen any bonus in under a minute. Plug in the four numbers, compare the expected loss to the bonus value, and check the maximum cashout. If the expected loss exceeds the bonus, the offer is negative-value before you even account for the cap. This is exactly the discipline behind the offers we flag on our ranked best crypto casinos list, applied consistently as described in our review methodology.
A well-chosen bonus can reduce the house's edge on a session, and occasionally tip it slightly in your favour, but it never removes risk. Treat any bonus as entertainment value with terms attached, size your play with a plan, and lean on our responsible gambling tools to stay in control.