Educational guide

Bull Flag: Structure, Measurement and Naming

A bull flag is commonly described as a sharp prior rise followed by a smaller consolidation that slopes sideways or down. The name reflects a conventional pattern label, not a guaranteed bullish outcome.

Two-part structure

The “flagpole” is the larger preceding move. The “flag” is the subsequent consolidation. Because there is no exchange-standard definition, the minimum size, duration and slope vary across charting methods.

Measurements are method-dependent

People may measure the flagpole, consolidation width or distance to a boundary. Any projection based on those distances depends on how the pattern endpoints were selected.

Naming can bias interpretation

Directional names can encourage users to treat a pattern as a forecast. A more disciplined approach is to first describe the observable geometry and only then discuss what the chosen method claims—if anything—about outcomes.

Study the synthetic example

The Breakout Lab uses a fictional path and makes no attempt to score or validate the pattern. You can compare its geometry with triangle and rectangle examples without importing market data.

Keep the distinction clear: a chart label describes geometry or past observations. It is not, by itself, a forecast, probability estimate or instruction to buy or sell.

Try the math yourself

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