# The Martingale betting system, defined

> What the Martingale doubling system is, a worked sequence starting at £5, why table limits cap the progression, and a reminder about risk. Not advice to use it.

Source: https://seatcheck.uk/martingale-system/
Updated: 2026-11-13

The Martingale system is a betting pattern in which you double your stake after each loss and go back to the starting stake after a win. This page defines it and shows the sum as of 13 November 2026. It is not a method for winning and not advice to use it; table limits stop the doubling.

## The sequence on a £5 start

Each loss doubles the next bet. The total you have staked by the end of a run of losses grows quickly.

**Martingale run of losses from £5 · derived by us from the definition**

| Bet number | Stake | Total staked so far |
|---|---|---|
| 1 | £5 | £5 |
| 2 | £10 | £15 |
| 3 | £20 | £35 |
| 4 | £40 | £75 |
| 5 | £80 | £155 |
| 6 | £160 | £315 |
| 7 | £320 | £635 |
| 8 | £640 | £1,275 |

After n bets the total is £5 × (2^n − 1). A win on the last bet returns a profit of the first stake, £5, and nothing more.

**Seat note:** the risk grows in steps of doubling; the reward stays at one starting stake.

## Why table limits cap it

A table has a minimum and a maximum stake, set by the operator and shown in the lobby. See [why table limits differ](https://seatcheck.uk/why-table-limits-differ/).

Illustration only: if a table's maximum were £100, the sixth bet of £160 in the table above would not be accepted, and the sequence would stop after £155 had been staked.

We have not recorded a real table's limits for this example. When we do, they will carry a date and the lobby as source.

## What it does not change

It does not alter the [house edge](https://seatcheck.uk/house-edge/). Every bet is still made under the table's rules, so the expected loss is the total staked times the edge.

In the example above, £315 staked at an illustrative 1% edge is £3.15 in expectation. The 1% is for the sum only. Whether the pattern works is checked in [does the Martingale work at blackjack](https://seatcheck.uk/does-the-martingale-work-at-blackjack/).

## Risk

A run of losses can use up your budget before a win arrives, and the next bet may not be allowed. Gambling is not a way to earn money or recover losses.

Decide your limit before you play: [set a deposit limit](https://seatcheck.uk/set-deposit-limit-before-you-play/). Help and tools are on [staying in control at a live table](https://seatcheck.uk/safer-live-play/). Free, confidential help is available from the National Gambling Helpline and GambleAware.

## FAQ

**What is the Martingale system?**

A betting pattern in which the stake is doubled after each loss and returned to the starting stake after a win.

**Why do table limits matter?**

Each doubling raises the stake. A table's maximum stops the sequence once the next doubled bet would exceed it, so the pattern cannot continue as long as the maths assumes.

**Does it change the house edge?**

No. Each hand is still played under the table's rules, so the edge on each bet stays the same.

**Do you recommend it?**

No. This page defines the term and shows the arithmetic. It is not an instruction to use it.