If you want to understand house edge with nothing in the way, play a few rounds of dice with a calculator open. No animation hides the outcome. No other players are involved. No item prices to argue about. You pick a target, the site rolls a number from 0 to 100 (to two decimals on most games), and you win if it lands where you said it would.
That transparency is the best thing about dice. It's also why the mistakes people make at dice are so easy to put numbers on.
The formula, then the table
Payout equals 100 minus the house edge, divided by your win chance. With a 1% edge, roll under 50 has a 50% chance and pays 99 ÷ 50 = 1.98x.
Here's that same game at a range of targets. The 1% edge is our example. CS2 sites set their own, and some take more.
| Roll under | Win chance | Payout | A $10 win returns |
|---|---|---|---|
| 5 | 5% | 19.8x | $198 |
| 10 | 10% | 9.9x | $99 |
| 25 | 25% | 3.96x | $39.60 |
| 50 | 50% | 1.98x | $19.80 |
| 75 | 75% | 1.32x | $13.20 |
| 95 | 95% | 1.042x | $10.42 |
Every row returns 99 cents per dollar on average. A 95% roll isn't safe. You win nearly every time, but each win is 42 cents, and the 1-in-20 loss costs $10, roughly 24 wins' worth. A 5% roll isn't a clever long shot either. It's the same 99% in a different wrapper.
Roll over and roll under are the same bet
Almost every dice game has a toggle. Roll over 50 and roll under 50 are identical bets. Roll over 75 is the same as roll under 25. Direction has no effect on the result, and anyone telling you a site "rolls high" more often hasn't checked their seeds. Our provably fair guide shows how to recompute any past roll, which settles that argument fast.
The martingale, with real numbers
Dice is where the martingale lives, because it's so easy to automate. Start with $1 at a 2x payout (roll under 49.5 at a 1% edge). Lose and you double. Win and you go back to $1. Every completed sequence wins you $1. Here's what the losing side of that looks like:
| Losses in a row | How often that happens | Total lost so far | Next bet |
|---|---|---|---|
| 6 | 1 in 60 sequences | $63 | $64 |
| 7 | 1 in 119 | $127 | $128 |
| 8 | 1 in 236 | $255 | $256 |
| 10 | 1 in 927 | $1,023 | $1,024 |
Say your balance is $255. That covers eight bets in a row, $1 up to $128. You'll win $1 on about 235 sequences out of 236 and lose $255 on the other one. That's a net loss, and it's just the house edge arriving in one ugly lump instead of a slow drip. A bigger bankroll pushes the bust further away and makes it bigger when it lands. Maximum bet limits can end the run even sooner.
The same logic sinks every progression system we've seen pitched in a CS2 site's chat. Changing bet sizes can't change the edge on each individual roll.
Variants you might see
Classic slider dice is the norm. Some sites add range dice, where you win if the roll lands between two numbers you set. Limbo is a close cousin: you set a target multiplier instead of a chance, and it's really crash without the animation. You'll occasionally run into player-versus-player dice too, where two people roll and the higher number takes the pot minus a fee. That plays more like coinflip with extra decimal places.
Choosing a site for dice
For dice specifically we care about three things. The edge, which you can test in ten seconds. The provably fair setup: can you change your client seed, see the hashed server seed before you roll and verify old rolls after rotating? And the bet limits, both minimum and maximum. CSGORoll is the highest-rated site on our list with dice, and it's been running since 2016. CSGOBig and Waste.gg both include dice among broader game lists, and Waste.gg has been around since 2017.
Dice is fast, and with auto-bet it's faster than anything else on these sites. If the auto-bet panel has a stop-loss, set it before the first roll, and if it doesn't, set a time limit instead. Every site we cover is 18+ and blocks the US and UK. If you're struggling to keep dice in its box, our responsible gambling page has help lines and blocking tools.