How to Read a Volatility Cone

A price target is a single point. A cone is the honest version: every price the asset could plausibly reach, and how the range of possibilities widens the further out you look.

What the cone is showing

A volatility cone plots a range of plausible future prices forward from today, widening as the horizon extends. The centre line is the current price; the edges are the boundaries of a confidence interval derived from the asset's volatility.

Each band answers a specific question. A 50% band means roughly half of outcomes should land inside it. A 95% band means the overwhelming majority should, with genuine surprises falling outside. Nested bands let you read both the likely and the extreme at once.

Why it widens — and why not linearly

Uncertainty grows with time, but not proportionally. Under the standard random-walk assumption, the width of the distribution scales with the square root of time, not time itself.

The practical consequence is that four times the horizon produces roughly twice the width, not four times. This is why the shape is a cone with curved edges rather than a widening triangle, and why short-dated ranges are much tighter than intuition suggests.

Reading the bands correctly

The bands are about the terminal price at each horizon, not about whether the price touches that level at some point along the way. Touching a level is considerably more likely than finishing beyond it, because the path has many chances to reach it and only one chance to end there.

Confusing these two is the most common misreading. If you care about whether a stop gets hit or an option goes in the money at any point, you want touch probability, which is roughly double the closing probability for a given level under symmetric assumptions.

What the cone assumes, and where it breaks

A standard cone assumes returns are approximately lognormal, volatility is stable over the horizon, and there is no drift. All three are simplifications.

Real returns have fat tails — extreme moves happen more often than the model implies, so true 95% bands should be wider than the arithmetic suggests. Volatility also clusters rather than staying constant, meaning a cone built during a calm stretch will understate the range if the regime shifts.

A cone is therefore a disciplined baseline, not a forecast. Its value is in replacing a single confident number with a visible, honestly-shaped range.

Reading a cone against real levels

The most useful comparison is between the cone and specific price levels you care about — a strike, a stop, a round number. If a level sits inside the 50% band, reaching it is unremarkable. If it sits outside the 95% band, the market would have to do something genuinely unusual to get there within that horizon.