Why Maximum Drawdown Matters More Than Peak Return

A strategy that returned 120% over three years sounds impressive. If it involved a peak-to-trough drawdown of 65% along the way, most traders would not have survived it — not because of the math, but because of the psychology.

The asymmetry of recovery

Drawdown has an asymmetric recovery problem that is easy to underestimate:

Drawdown	Recovery required
10%	11.1%
20%	25%
40%	67%
60%	150%

A 40% drawdown does not require a 40% recovery — it requires 67%. At 60% down, you must more than double your remaining capital just to return to the previous high. The compounding of losses works against you in a way simple percentage thinking disguises.

What drawdown actually measures

Maximum drawdown is not just a risk metric; it is a proxy for strategy fragility. A large drawdown often means:

1. The edge is less consistent than the backtest suggests — it worked in certain conditions but not others.
2. The sizing was too aggressive — the signal was fine but the bet was too big.
3. The strategy is regime-dependent — it works in trends but bleeds in ranges.

Calmar ratio as a practical filter

The Calmar ratio — annualised return divided by maximum drawdown — normalises for risk. A strategy returning 30% with a 15% max drawdown (Calmar of 2) is materially better than one returning 40% with a 50% max drawdown (Calmar of 0.8), despite the lower absolute return.

The psychological argument

Even if you are intellectually comfortable with a 50% drawdown on paper, most people change their behaviour while living through it — tightening stops at the wrong time, exiting early, breaking rules. Sizing conservatively enough that you can trade through your worst drawdown without changing your rules is one of the most undervalued properties a strategy can have.

This content is educational only — not investment advice.