What Is a Capture Ratio, and Why Does It Matter More Than Returns Alone?

Say two funds both returned 12% last year. On a factsheet, they look identical. But imagine Fund A got there by rising steadily, roughly matching the market’s ups and softening its downs. Fund B got there by swinging wildly — up 40% in a rally, down 25% in a correction, netting out to the same 12%.

Same return. Very different experience for the person who actually held it. Capture ratio is the metric built specifically to expose that difference.

The two halves: up capture and down capture

Up capture asks: on days (or months) the benchmark rose, how much of that rise did the fund actually capture? A fund with 80% up capture gained roughly 80% of what the index gained on the index’s good days.

Down capture asks the mirror question: on the benchmark’s bad days, how much of that decline did the fund pass through? Here, lower is better — a down capture of 60% means the fund only gave back 60% of what the index lost.

Occasionally a fund’s down capture is negative. That’s not an error — it means the fund actually rose on days the index fell. It’s a genuinely defensive signature, and on well-designed dashboards (including ours) it’s shown as favourable, not flagged as broken.

Combining them: the capture ratio

Divide up capture by down capture and you get a single number. Above 1.0 means the fund has, over the period measured, captured proportionally more upside than downside — the shape every investor wants, even if it doesn’t show up in the headline return figure.

Why this beats looking at returns alone

Annual return answers “what happened.” Capture ratio answers “how did it happen” — and that second question is what actually predicts how a fund will behave the next time markets get rough, which is usually the moment it matters most.

See capture ratios calculated for real, live funds on our comparison dashboard, or read the exact formula on our methodology page.