Column betting calculator - documentation

Stand-alone documentation for the Column Bet Martingale calculator on the Tools page. Inputs, outputs, math, and worked examples.

What the calculator does

The Column Bet Calculator on the Tools page models a 2:1 column Martingale progression for a given base unit and sequence depth, against an optional table maximum. It returns the full sequence of stakes, the maximum single stake, the total bankroll at risk, the net profit on any winning step, and how many steps complete before the table maximum rejects you.

Inputs

• Base unit ($): the smallest stake in the sequence. Always 1× this unit at step 1.
• Sequence depth (1–15): the number of progression steps to model. 8–10 is typical for $5–$10 units; 12+ requires deep bankroll.
• Table maximum ($, optional): the casino's posted outside-bet ceiling. If left at 0, the calculator does not flag any step.

Outputs

• Sequence: the dollar stake at each step, e.g., $10 → $10 → $20 → $30 → $40 → ...
• Maximum single stake: the largest dollar stake in the sequence (the final step).
• Total bankroll at risk: the sum of all stakes through the final step. This is the loss if every step loses.
• Net profit on any win: always 1× base unit. The Martingale recovers all prior losses + 1 unit on the next win.
• Steps before table limit: if a table maximum was entered, the step number at which the stake first exceeds the limit.

The math under the hood

Each step's stake is computed in units, then multiplied by the base dollar unit. This produces the classical 1, 1, 2, 3, 4, 6, 9, 14, 21, 31 sequence regardless of base unit size.

Worked example: $10 base, 10 steps, $1,000 table max

Output: max stake $310, total risk $920, profit $10 per winning step, 10+ steps safe under a $1,000 cap.

Reading the table-limit flag

If the calculator returns "Steps before table limit: 8" (for example), it means the 9th step's stake exceeds your specified maximum. The casino will reject step 9. You should treat 8 as your effective sequence depth and size your bankroll accordingly.

If the output says "10+ (safe)", your full sequence fits inside the table maximum.

How to use it for planning

1. Look up your venue's outside-bet maximum (or use an online operator's published cap).
2. Choose a base unit small enough that 10+ progression steps fit under the maximum. As a rule, base unit ≤ table max / 100.
3. Confirm you can absorb the "Total bankroll at risk" as a planned loss in 1 of every 50–100 sessions.
4. Stop the session at the planned progression depth - never extend it mid-session.

Limitations

The calculator assumes you place every step at the same table without splitting across operators. It does not model bet splits, partial recovery wins, or non-Martingale variants (D'Alembert, Labouchère, Fibonacci). For those systems, use the formulas in Column Martingale System or run a spreadsheet model.

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