Even a profitable betting strategy does not grow in a straight line. Your bankroll may hit a new high, give back part of the profit, stay below its peak for weeks, and only then recover.
That decline is called a drawdown.
When evaluating a betting strategy, drawdown can tell you more than profit or ROI alone. Two strategies may both return 10%, but one might never fall more than 5% from its peak while the other goes through a 35% decline along the way. The final return is the same, but the level of risk is very different.
- What Is Drawdown in Betting?
- A Simple Drawdown Example
- What Is Maximum Drawdown?
- Drawdown, Losses and Losing Streaks Are Not the Same Thing
- Why Drawdowns Happen
- How Variance and Drawdown Are Connected
- How Bet Size Affects Drawdown
- Why Recovering Takes More Than You Lost
- What Is a Normal Drawdown?
- Variance or a Strategy That No Longer Works?
- What Not to Do During a Drawdown
- Key Takeaways
What Is Drawdown in Betting?
Drawdown is the decline in your current bankroll or cumulative result from its previous peak.
Suppose your bankroll grows to $12,000. That is your new high.
After a run of bets, it falls to $10,800.
The drawdown is:
So the strategy is currently in a 10% drawdown from its latest peak.
The important point is that drawdown is measured from the highest value reached, not necessarily from the original starting bankroll.
If you started with $10,000, grew the bankroll to $12,000 and then dropped to $10,800, you are still up 8% overall. At the same time, you are in a 10% drawdown from the peak.
A Simple Drawdown Example
Here is how a bankroll might move over a series of bets:
| Stage | Bankroll | Peak | Current Drawdown |
|---|---|---|---|
| Start | $10,000 | $10,000 | 0% |
| Growth | $11,200 | $11,200 | 0% |
| New high | $12,500 | $12,500 | 0% |
| Decline | $11,800 | $12,500 | 5.6% |
| Low point | $10,500 | $12,500 | 16% |
| Partial recovery | $11,000 | $12,500 | 12% |
At $10,500, the largest decline from the $12,500 peak is:
Once the bankroll recovers to $11,000, the current drawdown falls to 12%. But the earlier 16% decline remains part of the strategy's track record. On this sample, it is the largest drawdown recorded so far.
What Is Maximum Drawdown?
Maximum Drawdown (MDD) is the largest decline from a bankroll peak to the lowest point that follows before a new high is reached.
The basic formula is:
For example:
- bankroll peak — $20,000;
- the bankroll then falls to $15,000;
- after that, it begins to recover.
The maximum drawdown is:
MDD gives you an idea of the worst peak-to-trough decline a strategy has experienced in the available data.
Drawdown, Losses and Losing Streaks Are Not the Same Thing
These terms are often used interchangeably, but they describe different things.
| Metric | What It Measures |
|---|---|
| Loss | A negative financial result relative to a chosen starting point |
| Losing streak | The number of consecutive losing bets |
| Drawdown | A decline in bankroll from its previous peak |
| ROI | Profit relative to total betting turnover |
A strategy may lose five bets in a row but still have only a modest drawdown if those losses came after a strong winning run.
On the other hand, a long drawdown does not have to consist of one long losing streak. It may be a slow sequence of wins and losses in which the bankroll simply fails to make a new high for weeks or months.
Why Drawdowns Happen
A drawdown does not automatically mean there is something wrong with the strategy. There are several possible reasons.
1. Normal Variance
Even a bet with positive expected value can lose. When several losing outcomes cluster together, the bankroll drops.
2. Higher Odds
Strategies built around odds of 3.00, 4.00 or 5.00 generally have a lower win rate. Wins come less often, which means losing runs can be longer.
We look at the relationship between hit rate and betting odds in more detail in “Win Rate in Betting: Why a High Hit Rate Does Not Guarantee Profit”.
3. Betting Too Large a Share of the Bankroll
Even an ordinary losing run can become damaging if too much of the bankroll is risked on each bet.
4. Overestimating Your Edge
A bettor may believe a strategy is profitable when the underlying probability estimates were inaccurate from the start.
5. Changes in the Market
A method that worked in the past is not guaranteed to remain equally effective forever. Betting markets, available information, models and pricing efficiency all change over time.
How Variance and Drawdown Are Connected
Variance and drawdown are closely related, but they are not the same thing.
Variance describes the random fluctuations in results around the expected outcome.
Drawdown measures one practical consequence of those fluctuations: how far the bankroll has fallen from its previous peak.
This is why a profitable strategy can still spend time in drawdown.
Suppose a bet has a true 55% chance of winning at odds of 2.00. In theory, that is a positive expected value bet.
But it still loses 45% of the time. A sequence such as:
is therefore perfectly possible even when the bettor has an edge.
We explain this in more detail in “Variance in Sports Betting: Why a Good Strategy Can Still Lose”.
How Bet Size Affects Drawdown
One of the biggest drivers of drawdown is the percentage of the bankroll risked on each bet.
Consider five consecutive losses.
If you stake around 2% of the current bankroll each time, roughly 90.4% of the starting bankroll remains after five losses.
That is a drawdown of about 9.6%.
If you risk 10% of the current bankroll on each bet, the same five losses leave you with only around 59% of the starting amount.
The drawdown is now roughly 41%.
| Bet Size | Bankroll After 5 Straight Losses | Drawdown |
|---|---|---|
| 2% of current bankroll | ≈ 90.4% | ≈ 9.6% |
| 5% of current bankroll | ≈ 77.4% | ≈ 22.6% |
| 10% of current bankroll | ≈ 59.0% | ≈ 41.0% |
The betting results are exactly the same in all three cases. The only thing that changes is position size.
Bankroll management does not determine which individual bet wins or loses. What it does determine is how much damage a bad run can do to your capital.
Why Recovering Takes More Than You Lost
One of the less intuitive features of drawdowns is that the deeper the fall, the larger the percentage gain needed to get back to the previous peak.
If your bankroll falls by 10%, a 10% return on the remaining money is not enough to recover completely.
For example:
$10,000 → 20% decline → $8,000.
To get from $8,000 back to $10,000, the bankroll needs to grow by:
The deeper the drawdown, the faster the required recovery rate increases.
| Drawdown | Gain Needed to Recover |
|---|---|
| −10% | +11.1% |
| −20% | +25% |
| −30% | +42.9% |
| −40% | +66.7% |
| −50% | +100% |
This is why controlling drawdown matters for more than just peace of mind. Once the bankroll suffers a major decline, getting back to the previous high becomes mathematically much harder.
What Is a Normal Drawdown?
There is no universal answer.
You cannot say that a 10% drawdown is always fine while 20% always means something has gone wrong.
An acceptable level depends on several factors:
- average odds;
- win rate;
- size of the betting edge;
- stake size relative to bankroll;
- number of bets;
- correlation between bets;
- stability of the strategy itself.
A strategy betting mostly around 1.50 with a high win rate will usually have a very different risk profile from a strategy backing underdogs at 4.00–6.00.
Comparing the two only by Maximum Drawdown, without looking at the rest of the data, does not tell you much.
Variance or a Strategy That No Longer Works?
This is one of the hardest questions when analysing betting results.
A drawdown alone cannot answer it.
It makes more sense to look at several indicators together.
Sample Size
A drawdown after 20 bets tells you something very different from a drawdown after 2,000 bets. Over short samples, randomness has a much larger influence on the result.
Win Rate Versus Break-Even Rate
A high win rate is not enough on its own. You also need to consider the average odds and the percentage of bets you need to win just to break even.
More on this: Win Rate and Profitability in Sports Betting.
The Quality of the Odds You Are Getting
If a strategy regularly gets better prices than the market's closing line, that can provide additional information about the quality of its selections.
This is where Closing Line Value (CLV) becomes useful.
Probability Estimates
If your probability estimates are consistently too optimistic, the edge you think you have may not exist at all.
The relationship between odds and implied probability is covered in “How to Convert Betting Odds into Probability”.
Changes in the Strategy
Check whether the markets, leagues, odds ranges, selection model or other conditions have changed compared with the period in which the strategy produced its earlier results.
What Not to Do During a Drawdown
Increase Stakes Just to Win the Money Back Faster
After a losing run, it is tempting to try to recover everything with one larger bet. The problem is simple: increasing the stake also increases the size of the next possible drawdown.
Change the Strategy After Every Loss
If the selection rules are constantly adjusted to fit the latest results, it becomes almost impossible to tell whether the original approach worked in the first place.
Treat Every Drawdown as Proof That the Strategy Is Bad
Short-term swings are unavoidable even when the underlying expected value is positive.
Assume Every Drawdown Is Just Bad Luck
The opposite mistake is just as risky. If actual results keep falling short of expectations, the probabilities, odds and model itself should be reviewed.
Judge a Strategy Only by Its Highest Profit
A return of +30% looks better than +15%. But without knowing what kind of drawdowns occurred along the way, the comparison is incomplete.
Key Takeaways
- Drawdown is the decline in bankroll from its previous peak.
- Maximum Drawdown is the largest peak-to-trough decline recorded over the period being analysed.
- A strategy with positive expected value can still go through significant drawdowns.
- The larger the percentage of bankroll risked on each bet, the faster potential drawdown grows.
- A 50% loss requires a 100% gain on the remaining bankroll to recover fully.
- There is no universal "normal drawdown" — it has to be viewed alongside odds, win rate, stake size and sample size.
- Historical Maximum Drawdown does not set a hard ceiling on future losses.
- Drawdown alone does not prove that a strategy is either good or bad.
Drawdown is best treated as a measure of risk rather than simply an unpleasant number on a results chart. Total profit tells you how much a strategy made. Drawdown tells you what kind of ride you had to endure to get there.