A staking model that sizes every wager to deliver a fixed target profit on the next win, regardless of prior losses. Used by professionals across horse racing and U.S./Canadian sportsbooks.
The core idea
The casino column Martingale works because the 2 : 1 payout is fixed. In sports and horse racing, the payout (decimal odds) varies bet-to-bet. The Due-Column system generalises the column Martingale to variable-odds markets while preserving the same goal: post a fixed target profit on the next win, no matter how many prior losses you've absorbed.
That equation is the whole system. Everything else is execution.
The mechanics of a column
A "column" in this context is a sequence of bets you commit to with a single target profit. You open a new column with a fixed target - say $100. Each selection inside the column uses the staking formula. When any selection wins, you bank the target and close the column. A new column opens on the next selection.
You're not predicting when the win comes. You're guaranteeing the size of the win when it does come.
Worked example - $50 target column
| Bet | Decimal Odds | Carried Loss | Required Stake | Result | Running |
|---|---|---|---|---|---|
| 1 | 3.00 | $0 | $25.00 | Loss | −$25.00 |
| 2 | 2.50 | $25.00 | $50.00 | Loss | −$75.00 |
| 3 | 4.00 | $75.00 | $41.67 | Loss | −$116.67 |
| 4 | 2.20 | $116.67 | $138.89 | Win | +$50.00 |
Bet 4's payout: $138.89 × 2.20 = $305.56. Subtract the $138.89 stake = $166.67 net win. Subtract the $116.67 carried loss = $50.00 target profit banked. Column closes.
Choosing the target profit
Set the target at roughly 1–2 × your typical individual stake. Too small a target requires constantly opening new columns and adds friction. Too large a target risks ballooning required stakes during long losing runs.
- Casual handicapper (5–10 bets/week): target = $50–$100
- Serious sharp (20–40 bets/week): target = $100–$250
- Pro syndicate operation: target = $500–$2,500
Bankroll requirement
The bankroll must absorb the maximum cumulative stake during a losing run. As a rule of thumb, plan for at least 6 consecutive losses at your typical odds range.
For a target of $100 at ~2.5 average odds, six losses compound to a 6th-bet stake near $900 and cumulative exposure near $2,500. Bankroll should be ≥ $3,000 to comfortably absorb that depth.
Selection quality matters more than staking
The Due-Column system cannot overcome a long-run losing handicapper. The formula recovers losses on the next win - but if your hit-rate is too low for the average odds, no staking model can save you. The math expects you to be a competent selector.
Comparison to flat staking
Flat-stake players make N bets at the same unit. Their P/L is the sum of winning units minus losing units, with no recovery mechanic. Due-Column players target a profit per cycle and adjust each stake to deliver it.
The key trade-off: Due-Column smooths bankroll growth into predictable cycle-completions but exposes deeper drawdown during losing runs. Read Due-Column vs Martingale for the deeper math, and try the Due-Column calculator for your specific scenario.
Continue reading
Responsible Gaming
Every system on this site is educational. None eliminate the house edge. Set a loss cap and a time cap before every session.
USA: 1-800-GAMBLER · Canada (ON): ConnexOntario