Downside Capture Ratio Explained

Last verified: 2026-07-17

Downside capture ratio measures how much of a benchmark’s negative return a fund, portfolio, or strategy captured during down periods. In plain English: when the benchmark had a bad stretch, did the strategy fall less, about the same, or more?

Educational note: this is a research and planning framework, not personalized tax, legal, or investing guidance.

The simple framework

The simple formula is strategy return during down benchmark periods divided by benchmark return during those same periods, multiplied by 100. If the benchmark was down 10% across the measured down periods and the strategy was down 7%, downside capture is about 70%. If the strategy was down 12%, downside capture is about 120%. Lower is not automatically better; it must be reviewed against upside capture, fees, risk, taxes, liquidity, and the portfolio job.

Example workflow

Example: a benchmark falls 8% during a weak quarter. Strategy A falls 5%, so the rough downside capture is 5 ÷ 8 × 100 = 62.5%. Strategy B falls 9%, so the rough downside capture is 112.5%. Strategy A defended better in that window, but the review is not finished until you check whether it lagged badly in recoveries, used different exposures, or changed its rules.

What to write down before acting

▸Benchmark used for the comparison and why it fits.
▸Start and end dates for the measured down periods.
▸Strategy return, benchmark return, fees, taxes, and cash-flow notes if available.
▸Upside capture or recovery behavior so downside is not reviewed in isolation.
▸The portfolio role: defense, income, growth, diversification, or trading sleeve.

Common mistakes

▸Comparing downside capture against the wrong benchmark.
▸Treating one short drawdown as enough evidence.
▸Ignoring upside capture, volatility, concentration, and recovery time.
▸Assuming a low ratio means the strategy fits every investor or account.

Bucko workflow

Use Bucko to keep the source record, research note, journal tag, guardrail, and follow-up review in one place. TradingView indicators, Monko user-configured automation, Copy Trader risk notes, and Station AI review workflows can support the process, but the user-defined rule and audit trail should stay visible.

Practical checklist

▸Pick the benchmark before calculating the ratio.
▸Use the same time window for the strategy and benchmark.
▸Separate market decline protection from cash drag or sector exposure.
▸Review downside capture next to upside capture and drawdown duration.
▸Write what decision the metric is allowed to influence before acting.

Frequently Asked Questions

What is downside capture ratio in simple terms?

Downside capture ratio estimates how much a strategy participated in benchmark declines. A 70% ratio means the strategy fell about 70% as much as the benchmark during the measured down periods.

Is a lower downside capture ratio always better?

No. Lower downside capture can be useful, but it may come with lower upside participation, more cash drag, different exposures, higher costs, or a role that does not match the portfolio.

What should I compare downside capture against?

Use a benchmark that matches the strategy’s actual universe and purpose. Comparing a bond-heavy strategy to a pure stock index can create a misleading review.