BullsEdges algo trading guide: Maximum drawdown tells you how much pain a strategy causes before it pays. Learn how it is measured and why it often matters more than total profit.
When traders compare strategies, they usually look at total profit first. Professionals look at drawdown first. Drawdown measures how far the account falls from its highest point before it recovers - in other words, how much pain you must survive to get the profit.
BullsEdges algo trading application: Evaluate equity drawdown alongside closed profit so that open losses do not disappear from the assessment.
How drawdown is measured
- Peak: the highest equity reached so far.
- Drawdown: the fall from that peak to the current value.
- Maximum drawdown: the largest such fall over the whole period.
If an account grows from $10,000 to $14,000, falls to $11,200 and then climbs to $16,000, the maximum drawdown is $2,800, or 20% of the $14,000 peak.
Balance drawdown vs equity drawdown
Balance only changes when trades close. Equity includes open, floating losses. For strategies that hold losing positions for a long time - grids, averaging systems, trades without stop losses - the equity drawdown can be far deeper than the balance shows. A grid can have a smooth, rising balance curve while equity regularly dips 40% below it. Always look at equity.
Why drawdown matters so much
- Recovery maths. A 50% drawdown needs a 100% gain to get back to even.
- Psychology. Most traders abandon a strategy during a deep drawdown - usually close to the bottom.
- Margin. Deep equity drawdowns bring you close to the broker's stop-out level, where positions are closed automatically at the worst time.
- The future is worse. The maximum drawdown in a backtest is a minimum estimate. Live trading will eventually produce a deeper one.
Useful ratios
- Return / max drawdown: annual return divided by maximum drawdown. Above 1 is decent, above 2 is strong.
- Recovery time: how long the longest drawdown lasted. A strategy that spends 9 months under water is hard to live with even if it ends positive.
Planning for drawdown
- Look at the backtest's maximum equity drawdown and assume live trading could see 1.5 to 2 times that.
- Size positions so that this larger number is something you can accept financially and emotionally.
- Decide in advance what drawdown means the strategy has stopped working - and what you will do then.
- Consider a hard maximum drawdown stop in the EA: if floating loss reaches a set percentage, close the basket and stop.
BullsEdges takeaway for algo trading
Profit tells you what a strategy can earn. Drawdown tells you whether you can survive long enough to earn it. Choose the strategy - and the lot size - with the drawdown you can live with.
Trading forex and gold carries a high level of risk and may not be suitable for every investor. Past performance and backtests do not guarantee future results. This article is education, not financial advice.