What Is Drawdown in Trading? A Beginner’s Guide (With Examples)

So you run a few backtests and start comparing results, but what does drawdown in trading actually mean?

You see something confusing:

• One bot has 5% drawdown
• Another has 15% drawdown

👉 But the strategy is exactly the same.

When can percentages look good but the actual performance is bad?
And when can it look bad—but perform well?

If this is all new to you, or you just need a refresher, this guide will help you clearly understand what drawdown is and why it changes.

There is also a small guide on Trading Drawdown Protection.

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What Is Drawdown in trading?

Drawdown in trading is one of the most important metrics —but also one of the most misunderstood.

Drawdown in trading is the percentage decline in your account equity from its highest point to its lowest point before recovering, showing the maximum temporary loss during a trading period.

In simple terms:

• Your account grows → reaches a high
• Then drops → that drop is drawdown
• When it recovers → drawdown resets

Key Idea

Drawdown is not your total loss.

👉 It’s the temporary drop from the highest point your account reached.

Why This Matters

You could:

• Be profitable overall
• But still experience drawdown along the way

That’s completely normal.

👉 If misusing the drawdown is a known mistake, here are a few more mistakes traders make with compounding:

Top 10 Mistakes Traders Make with Compounding in Trading

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How Is Drawdown Calculated?

Drawdown is calculated using your equity, not just raw trade profits.

Equity = Initial Capital + Cumulative PnL

This is important because drawdown reflects your actual account value over time, not just isolated trades.

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❌ Incorrect Way: Using PnL Only

Let’s look at this trade sequence:

+5, +7, -4, -3, +4, +6, +5

If we calculate drawdown using PnL only:

• Highest point before drop = 12
• Lowest point = -7

$$\text{PnL Drawdown} = \frac{7}{12} \times 100 = 58\%$$PnL Drawdown=58%

👉 That looks extremely risky.

But it’s misleading.

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✅ Correct Way: Using Equity

Now let’s include starting capital.

Starting balance = $300

Equity curve becomes:

305, 312, 308, 305, 309, 315, 320

Now:

• Peak = 312
• Lowest after peak = 305
• Difference = 7

$$\text{Equity Drawdown} = \frac{7}{312} \times 100 = 2.24\%$$Equity Drawdown=2.24%

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Why This Is the Correct Method

Because drawdown is defined as:

The maximum drop in your account value from a peak before it recovers.

Not just trade fluctuations.

👉 Even though total profit is +20, at one point you were 2.24% below the peak—that’s your true drawdown.

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Now Let’s Play With the Backtest

Let’s say you take the exact same strategy:

• Same entries
• Same exits
• Same market conditions

But you change:

• Position size
• Or starting capital

Now suddenly…

👉 You get different drawdown percentages

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Why Does Drawdown Change If the Strategy Is the Same?

This is the key insight:

Drawdown percentage is affected by scale.

What does that mean?

Drawdown % and PnL % are scale-dependent:

• Bigger positions → larger swings → higher PnL % → higher drawdown %
• Smaller positions → smaller swings → lower PnL % → lower drawdown %

👉 The strategy behavior does not change
👉 Only the size of the movements changes

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Important Detail

• Absolute drawdown (in dollars) stays proportional
• But percentages change depending on:
  • Account size
  • Trade size

So:

Same strategy + same data = different % results depending on scaling

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Why This Confuses So Many Traders

You might compare two bots (for example in AlgoColony) and see:

• Bot A: Higher drawdown
• Bot B: Lower drawdown

And assume:
👉 “Bot A is worse”

But in reality:

👉 Bot A might just be trading different positions sizes

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When Drawdown Looks Bad (But Isn’t)

A higher drawdown might simply mean:

• More aggressive position sizing
• Faster growth potential

Example:

• 30% return with 16% drawdown

This can still be very efficient.

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When Drawdown Looks Good (But Isn’t)

A low drawdown might mean:

• Very small position sizes
• Slow growth

Example:

• 4.6% return with 3.33% drawdown

👉 Safer—but possibly too slow depending on your goals

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Return vs Drawdown (A Better Way to Compare)

Instead of looking at drawdown alone, use:

Strategy	Return	MDD	Ratio
Aggressive	30%	16%	1.88
Conservative	4.6%	3.33%	1.38

How to Read This

• Higher ratio → better efficiency
• Lower ratio → safer but slower

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Important Insights

• Drawdown is based on equity, not raw PnL
• Position size directly affects drawdown %
• Initial capital affects how risk is perceived
• Same strategy can show very different results depending on scaling

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How Professionals Handle Drawdown

Professionals don’t just look at one number.

They:

• Calculate drawdown using full equity
• Track maximum drawdown (MDD)
• Compare return vs drawdown
• Visualize equity curves and drawdown curves
• Adjust position size instead of constantly changing strategy

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Key Takeaways

• Drawdown shows the largest drop from a peak, not total loss
• Equity-based calculations give the most accurate view
• Position size and capital heavily influence percentages
• Same strategy ≠ same drawdown
• Return-to-drawdown ratio helps evaluate performance

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Final Thought

Understanding drawdown changes how you see trading completely.

Instead of asking:

👉 “Is this drawdown good or bad?”

Ask:

• What position size is being used?
• How does it compare to the return?
• Is the strategy consistent?

Because:

Drawdown doesn’t tell you if a strategy is good—it tells you how it behaves.