Peak-to-trough drawdown measures how far an investment or portfolio falls from a previous high before establishing a new high. It is one of the clearest ways to describe the severity of a historical loss because it captures the actual decline an investor would have experienced along the way.

What Is Peak-to-Trough Drawdown?

Suppose a portfolio rises from £100,000 to £120,000 and later falls to £90,000 before recovering. The peak is £120,000, the trough is £90,000 and the drawdown is £30,000, or 25% of the peak.

The percentage formula is:

Drawdown = (Current Value − Previous Peak) ÷ Previous Peak

Because the current value is below the peak during a drawdown, the result is negative. Investors often report the magnitude as a positive percentage, such as a 25% drawdown.

What Is Maximum Drawdown?

Maximum drawdown is the largest peak-to-trough decline recorded during a chosen period. It is a historical measure of the worst loss from a high point before recovery to a new high.

Maximum drawdown is particularly useful when comparing strategies because average volatility can hide the severity of a sustained decline. Two portfolios can have similar annual volatility while having very different worst-case historical losses.

Drawdown vs Volatility

Why Losses Become Harder to Recover From

Drawdown has a nonlinear effect on recovery. A 10% decline requires an 11.1% gain to return to the starting value. A 25% decline requires a 33.3% gain, while a 50% decline requires a 100% gain.

This is why controlling severe losses can have an important effect on long-term compounding. Investors should care not only about average returns, but also about the depth and duration of losses needed to achieve them.

Recovery Time Matters Too

Two investments can both experience a 20% drawdown but have very different investor experiences if one recovers in months and the other takes several years. Recovery time is therefore a useful companion to maximum drawdown.

Long recovery periods can also create behavioural pressure. Investors who cannot tolerate seeing a portfolio below its previous high may sell at the worst point, turning a temporary drawdown into a permanent loss.

Drawdown at Portfolio Level

An individual security can experience a large drawdown without causing the same decline in the total portfolio. Position size, correlation and diversification determine how security-level losses translate into portfolio-level outcomes.

Conversely, several holdings can fall together during a market shock. A portfolio that looks diversified by number of holdings can still experience a large drawdown if its positions share the same economic drivers.

How Investors Can Use Drawdown

• Compare strategies with similar objectives.
• Assess whether a historical loss is compatible with risk tolerance.
• Review the duration of recovery after major declines.
• Combine drawdown with volatility and risk-adjusted returns.
• Stress-test how a similar decline would affect the current portfolio.

Drawdown and Position Sizing

Position size determines how much an individual drawdown can affect the total portfolio. A 50% decline in a 2% position has a very different portfolio impact from the same decline in a 30% position.

This makes drawdown particularly useful when setting allocation limits. Investors can ask not only how much an asset has historically fallen, but how much that fall would matter at the proposed portfolio weight.

Drawdown and Risk-Adjusted Returns

Maximum drawdown works well alongside Sharpe and Sortino ratios. A strategy may have attractive average risk-adjusted returns while still having a severe historical loss. Looking at both helps investors understand the trade-off between return efficiency and practical downside.

For more on risk-adjusted performance, see Sharpe vs Sortino.

FAQ

Is drawdown the same as a loss?

No. Drawdown measures the decline from a previous peak. An investment can have a drawdown without the investor having sold and realised a loss.

Is maximum drawdown a prediction?

No. It describes the worst historical decline during the period measured. Future drawdowns can be smaller, larger or different in character.

Should every investor minimise drawdown?

The appropriate level depends on objectives and risk tolerance. Drawdown helps make the trade-off explicit rather than defining risk as volatility alone.

Conclusion

Peak-to-trough drawdown turns an abstract idea of investment risk into a tangible measure of loss. Used with recovery time, volatility, Sharpe or Sortino and portfolio concentration, it helps investors understand how a strategy may behave through difficult markets and whether its downside is appropriate for the role it plays in the portfolio.