Chart Patterns

What are chart patterns?

Chart patterns are recognizable structures that price swings form on a chart, such as rectangles, triangles, flags, double tops and head and shoulders. Each one turns a sequence of highs and lows into a set of levels: the boundary that activates the setup, an entry, an invalidation and a measured objective. Traders read each structure as a reversal or a continuation of the preceding trend.

Start with the chart interval and session. Mark the swing points and draw the selected support and resistance levels or trendlines. Define the price event that activates the setup.

Reversal vs continuation chart patterns

Reversal setups include Double Top and Double Bottom and Head and Shoulders. They organize a trade against the preceding trend.

Continuation setups include Flags, Pennants and Cup and Handle. They organize an extension of the earlier move.

Rectangles, Triangles and Wedges require the preceding trend and actual breakout direction to establish the continuation or reversal relationship.

Candlestick Patterns add another layer by comparing candle bodies and ranges at the selected level. They include single-candle shapes and multi-candle sequences such as the five-candle rising three methods.

How to calculate a chart pattern price target

A rectangle uses its support-to-resistance height. A triangle uses a selected base height. A flag or pennant uses the preceding pole. Head and shoulders uses the distance from the head to the neckline; a cup uses its depth below the selected rim reference.

Then choose the projection anchor. This rectangle example projects from the broken boundary. Flag and pennant examples can project from a selected end of the pause or from the breakout reference. Keep that choice explicit, including the corresponding bearish reference.

The pattern’s name, measurement and anchor belong together. They make every target reproducible.

Chart pattern target example: the $48–$52 rectangle

Support is $48, resistance is $52 and height is $4. The breakout session closes at $52.60 with a $51.60 low. Assume entry at $52.60 and a stop reference of $51.40.

The boundary-anchored target is $52 + $4 = $56. Entry-to-target distance is $3.40; entry-to-stop distance is $1.20. Their ratio is 2.83.

Using the breakout close as an alternative anchor gives $56.60, a $4 target distance and a 3.33 ratio. The $0.60 target difference comes entirely from the anchor.

The following example sequence returns to $52.15 and reaches $55.35, leaving $0.65 to the boundary objective.

How traders confirm and size a chart pattern trade

A Breakout rule can use an intrabar crossing or a close beyond the selected level. Specify the rule and order type, then calculate size from the chosen entry and stop reference.

Compare participation with Relative Volume and the price distance with Average True Range. Keep those measurements separate from the pattern geometry.

Read the $52 breakout in Options Flow for call premium paid at the ask, then price each structure in the Options Profit Calculator at the $56 objective and at the $55.35 the example actually reached.

Limitations of chart patterns

• Fix the construction rules before marking swings. Traders can mark different swings and boundaries on the same chart, and the interval and session change the highs and lows used.
• Trade the breakout that occurs, with the stop set before entry. Rectangles, triangles and wedges can resolve in either direction, and the invalidation level handles a pattern that fails after the breakout.
• Name the anchor with every target, and trail the stop as price approaches it. The rectangle gives $56 or $56.60 depending on the anchor, and the example ends at $55.35, short of both.
• Define the rule before the chart plays out, because patterns are easiest to see in hindsight. Record its untriggered and failed cases, then judge its results on all of them.
• Write the trigger type into the rule. An intrabar trigger and a closing trigger activate at different times and prices, so the same pattern can produce different trades.

Bottom line

Chart patterns turn a sequence of price swings into clear levels: a trigger, an invalidation and a measured objective. Fix the interval, construction rules and target anchor before price breaks out, size from the entry-to-stop distance, and judge any pattern rule on all of its cases, including the ones that fail.