Many betting systems change your stake based on recent results. Flat betting doesn't: you choose one stake and keep it. That makes it the simplest system and the easiest one to budget, which is why it suits players who want to control how much a session costs.
How flat betting works
Pick a stake as a share of your session budget and bet it every round. One rule of thumb for even-money bets is 1–2% of the budget, so a $250 budget means $2.50–$5 bets. If the stake is too large for long losing runs, lower it for the next session, not mid-session.
Some players allow one adjustment: a new flat stake after the budget has grown or shrunk by a set amount, such as 50%. This stays a flat system as long as the stake doesn't change round by round in response to wins or losses.
What a session costs
With a fixed stake, the expected cost of a session is the total amount bet multiplied by the house edge. The results of any single session will be far from that, in both directions, but the average is easy to plan for.
| Game and bet | Stake × rounds | Total bet | House edge | Expected loss |
|---|---|---|---|---|
| Roulette, red (single zero) | $5 × 100 | $500 | 2.70% | $13.50 |
| Baccarat, banker | $10 × 100 | $1,000 | 1.06% | $10.60 |
| Roulette, red (double zero) | $5 × 100 | $500 | 5.26% | $26.30 |
The table shows why the choice of game and bet matters more than the system. The same flat stake costs about twice as much on a double-zero wheel.
Flat betting at live tables
Blackjack
Flat betting pairs well with basic strategy. Doubles and splits add to the stake on some hands; that is part of correct play, not a change of system. See live blackjack.
Baccarat
Flat bets on banker or player keep the edge near 1%. Avoid the tie bet at 8:1, which carries a much higher edge. See live baccarat.
Roulette
Even-money bets give the smoothest flat-betting results. Straight-ups at a flat stake swing far more, though the edge is the same 2.70% on a single-zero wheel.
Flat betting vs the Martingale
| Flat betting | Martingale | |
|---|---|---|
| Stake | Fixed | Doubles after each loss |
| Typical session | Small ups and downs | Many small wins, occasional large loss |
| After 6 losses at $5 | Still $5 | $315 lost, next bet $320 |
| House edge | Unchanged | Unchanged |
| Risk of hitting table maximum | None | Real on long losing runs |
Neither changes the expected loss per dollar bet. The Martingale only rearranges losses into rare large ones, which is why it fails players who can't afford the bad run. More in the gambler's fallacy.
Pros and cons
- Pro: predictable cost and simple bookkeeping.
- Pro: no pressure to raise stakes after losses.
- Con: no way to recover a losing session quickly, which is also its main protection.
- Con: long sessions still add up; set a time limit too. See responsible gaming.
