Reviewed October 3, 2026 · Chart-pattern education
A flag is a brief channel after a sharp move. The pause does not guarantee another move in the same direction.
This guide focuses on the pole, roughly parallel boundaries and a stated continuation condition. It uses invented geometry and numbers rather than a selected historical winner.
The initial move is part of the definition.
A converging pause is examined separately as a pennant.
A flag has a pole and a roughly parallel pause
The conventional flag follows a sharp price move with a compact consolidation between roughly parallel boundaries, often leaning against the preceding move. StockCharts distinguishes this channel-like flag from a converging pennant. The names should not be swapped simply because both follow a pole.
Scroll across the table to see all columns.
| Element | After an advance | After a decline |
|---|---|---|
| Pole | A sharp upward move. | A sharp downward move. |
| Flag | A compact pause, often sloping downward. | A compact pause, often sloping upward. |
| Continuation hypothesis | An upside resolution. | A downside resolution. |
| Unresolved risk | The pause can deepen or break the other way. | The pause can turn into a recovery. |
The pole matters as much as the small channel
A drifting range without a preceding sharp move does not satisfy the same flag definition. Specify the pole’s endpoints and what counts as sharp relative to the instrument and timeframe. A daily-chart description cannot be copied into an intraday test without defining the new inputs.
The boundaries need not be perfectly parallel to the pixel, but a study must state its tolerance. If the two sides visibly converge, compare the pennant guide. If the consolidation becomes much longer than the initial rule permits, retain that as a changed or expired candidate rather than quietly extending the rule.
Projecting the pole requires a reference point
Consider an invented advance from $100 to $110, followed by a flag. Assume the selected upside-break reference is $108. Under a convention that adds pole length to that reference, the projection is $118. The example uses the breakout reference, not the pole’s original $110 high.
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| Step | Calculation |
|---|---|
| Pole length | $110 − $100 = $10 |
| Selected breakout reference | $108 |
| Projected level | $108 + $10 = $118 |
| If an independent rule assumed a $109 entry | $118 − $109 = $9 to the projection, before costs |
Projection conventions can differ. State the one used before comparing results. A $10 pole is not automatically a $10 achievable gain, and a plotted objective does not provide a time horizon or a success probability.
Do not rename a failed continuation to preserve a win
Under the selected definition, a break against the pole is a different outcome from continuation with it. A subsequent reversal pattern might develop, but calling the original failure a successful “flag reversal strategy” after the event does not validate the earlier rule.
Waiting for a retest changes the strategy
A return to the broken boundary may never happen. It may also continue through the area. A retest entry and a first-break entry have different timing and fills; neither is established here as more profitable.
A short checklist for studying flags
- Record the pole. Keep its start, end, size and observation window.
- Define the channel. State boundary tolerance and permitted consolidation length.
- Specify completion. Distinguish an intrabar crossing from a completed-bar condition.
- Keep failures. Include opposite breaks and unresolved candidates.
- Evaluate implementation. Combine the shape with stated entry, sizing, exit and cost rules.
For a shared framework, read continuation patterns. For testing details and execution limits, use the research guide. Adding volume or another indicator is an additional rule to investigate, not a certificate of accuracy.
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Sources and method
Substantively reviewed October 3, 2026. Diagrams and numerical examples are original, synthetic teaching material. They do not reproduce a security’s trading history, a backtest or a validated strategy. Pattern names describe charting conventions; this article assigns no success probability.
Primary references: StockCharts flag and pennant conventions.
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What changed in this update
Separated flags from pennants, removed unsupported claims of reliable outcomes and superior retest entries, and replaced after-the-fact reversal claims with explicit failure handling. The original URL and publication date are preserved.
Educational information, not personalized investment advice or a recommendation to trade. A diagram or measured-move projection does not guarantee an outcome.