Bankroll management & staking

A bankroll is money you have ring-fenced for betting and nothing else. It is not your rent, it is not the housekeeping, and it is not the balance in your betting account on any given day. It is a fixed pot you decide on in advance, track on its own, and judge everything against.

The single rule that makes it work is that you do not top it up mid losing run. The moment you reach for more money to steady a bad week, the bankroll stops being a measuring stick and becomes a hole. Set the number once, and let your results move it up or down honestly.

A unit is a small fixed fraction of your bankroll, usually 1% to 2%. Betting in units means every stake is sized against the pot rather than against how confident you happen to feel. Confidence is the least reliable input you own, and it is loudest exactly when you are on a heater or trying to win back a loss.

Level staking means the same amount on every bet, full stop. If your unit is $20, you stake $20 whether you love the bet or merely like it. It is simple, transparent, and almost impossible to get wrong, which is exactly why disciplined bettors keep coming back to it.

Its weakness is that it ignores the size of your edge, so a razor-thin value bet and a monster both get the same $20. For most people that trade-off is worth it, because the errors you avoid by keeping things simple outweigh the theoretical gains you leave on the table.

Percentage staking sets each bet as a fixed share of your current bank, not your starting bank. Stake 2% and a $1,000 bank means $20 a bet; drop to $800 and your next bet is $16 without you having to decide anything. The plan shrinks your stakes automatically through a downswing and grows them as you recover.

That built-in braking is the whole appeal. It cannot save a losing method, but it makes a genuine drawdown far harder to turn into ruin, because you are always betting a slice of what you have rather than what you used to have.

Kelly sizes each bet by your edge and the odds on offer. The fraction of your bank to stake is your edge divided by the decimal odds minus one, so on a bet you price at a 5% edge at 3.00, Kelly suggests 0.05 ÷ (3.00 − 1) = 2.5% of the bank. Bigger edges and shorter prices push the stake up; thinner edges push it down.

Full Kelly is mathematically optimal for growth but brutally aggressive, and it assumes your edge estimate is exactly right, which it never is. That is why most sensible bettors use half or quarter Kelly, keeping most of the upside while cutting the swings to something a human can actually live through.

Every method above earns its keep during the bad stretches, not the good ones. Staking 1% to 2% of your bank per bet is what lets you ride out a normal downswing and still have a bankroll on the other side. The table below tracks a $1,000 bank through the same eight-loss run under three plans.

The lesson is not which plan wins the arithmetic by a few dollars. It is that the small, sensible fractions all leave you standing, while the big one takes a routine losing run and turns it into a crisis you may not come back from.