Flat Betting Vs Percentage Staking

Once you have a unit, you have to decide whether it moves. Flat betting keeps the stake fixed regardless of results; percentage staking recalculates it from the current bankroll. Both are defensible, and they behave quite differently.

Flat Betting

You set a stake — say 50 — and bet it on every play for a defined period, regardless of whether the bankroll has grown or shrunk.

Advantages. Simple to execute and to audit. Records are directly comparable because every bet risked the same amount. It removes the temptation to adjust sizing emotionally, since there is nothing to adjust.

Disadvantages. It does not compound: a growing bankroll keeps betting the same fraction-shrinking amount. And after a large drawdown, the fixed stake represents a rising percentage of what remains, which increases risk exactly when it should fall.

Flat betting is what almost every published record uses, precisely because it isolates handicapping performance from staking decisions.

Percentage Staking

You set a percentage — say 1.5% — and recalculate the stake from the current bankroll each time.

Advantages. It compounds during winning stretches and automatically de-risks during losing ones. Mathematically it cannot bust the bankroll, since the stake shrinks proportionally forever.

Disadvantages. Recovery is slower than the fall. Losing 20% requires a 25% gain to get back, and betting smaller during the recovery extends it. It also produces awkward stakes and requires constant recalculation.

The Practical Middle Ground

Most disciplined bettors use flat betting within a period and recalculate between periods.

Set the unit from your bankroll on the first of the month, bet flat all month, recalculate on the first of the next. That gives you flat betting's simplicity and auditability, plus percentage staking's compounding and de-risking, with one decision a month rather than one per bet.

The standard exception is a sharp drawdown: falling 25% or more warrants an immediate recalculation rather than waiting for the review date, because continuing at the old stake after a large loss increases risk precisely when it should be reduced.

What About Kelly?

The Kelly criterion is a percentage scheme that sizes each bet from your estimated edge rather than using a fixed percentage. In theory it maximises long-run growth.

In practice full Kelly is far too aggressive for sports betting, because it assumes your edge estimates are accurate and they are not. Overestimating an edge by a couple of percentage points produces stakes several times larger than optimal, and the resulting swings are brutal.

Fractional Kelly — a quarter or an eighth of the recommended stake — is used by some professionals and typically lands in the same 1 to 2% range as a simple unit scheme anyway. See Kelly criterion.

Frequently Asked Questions