Chart Patterns: How to Read Them and What They Can't Tell You

Where this page's information comes from

• StockCharts' ChartSchool, an educational library, for the conventions it teaches on confirmation, retests and price targets. Those points are attributed in the text.
• Thomas Bulkowski's glossary on ThePatternSite, for his definitions of terms such as confirmation, throwback and busted pattern.
• TradingLoot's own explanations, for the general method and the diagram. They describe how patterns are commonly read, not rules that guarantee an outcome.

This page gives no success rates or performance statistics. Where measured results matter, it points to our summary of Bulkowski's research instead.

What a chart pattern is, and isn't

A chart pattern is a shape that recurs often enough to have a name. Each one is a summary of a contest: where buyers kept stepping in, where sellers kept capping rallies, and what happened when one side gave way. Reading a pattern means reading that contest, not matching a picture.

That's also its limit. A pattern describes the past. It can suggest which way pressure has been building, but it can't tell you whether the next move will follow through, how far it will go, or when. Treat a pattern as a way to organize what you see and to decide where you'd be wrong, not as a forecast.

Japanese candlesticks work at a smaller scale. Each candle summarizes a single period's open, high, low and close, while a chart pattern describes a structure that forms across many periods and can also be read on bar or line charts. For how individual candles are read, see how to read Japanese candlesticks.

How to read any chart pattern

Whatever the shape, the same sequence applies. The diagram below shows it on an idealised range that breaks downward, with a second, dashed path showing how the same pattern can fail.

1. Start with the trend

A pattern only means something relative to what came before it. ChartSchool is explicit that without a prior trend to reverse, there can't be a reversal pattern at all. Before naming a shape, ask what move it formed after.

2. Find the boundaries

Most patterns are defined by a level or line that price keeps reacting to: the neckline of a head and shoulders, the low between the two peaks of a double top, the sides of a triangle. That boundary is where the pattern will be confirmed or not, so it's the line that matters most.

3. Wait for confirmation

Bulkowski defines confirmation as the price at which "squiggles on a chart become a valid chart pattern," usually when price breaks out through the pattern's boundary. ChartSchool makes the same point about double tops: until the support between the peaks is broken convincingly, it says, the trend remains up. Before confirmation you have a possible pattern, not a pattern.

4. Know where the reading would be wrong

Every pattern reading should come with an invalidation point: a price that would show the reading was wrong, typically back through the pattern on the other side. Deciding it in advance is TradingLoot's practical advice, not a rule from the sources, and it applies whatever method you trade with.

False breakouts and failed patterns

Not every break holds. Price can poke through a boundary and slip straight back, which is why ChartSchool suggests filters before treating a break as valid, such as requiring a 3% break or for the break to hold for three days. For double tops, it calls not acting too early perhaps the most important point of all. Filters reduce false signals, but they also mean acting later; neither choice removes the risk.

A pattern can also fail after it has been confirmed. Bulkowski calls this a busted pattern: price moves no more than 10% after the breakout, then reverses and crosses the other side of the pattern, starting a trend in the new direction. That is the dashed path in the diagram. A failed pattern is information too: it shows the side that seemed to be winning couldn't follow through.

Price also often comes back to test a boundary it has just broken. ChartSchool notes that broken support often becomes resistance, and that price sometimes returns to that level. Bulkowski calls the return a throwback after an upward breakout and a pullback after a downward one, each within 30 days. Terminology varies between sources, so check how a guide defines them.

Volume and context

Volume is often used as supporting evidence. ChartSchool, for example, treats volume confirmation on the break of a head-and-shoulders neckline as one of the most critical factors. Treat volume as one input to weigh, not as a switch that turns a pattern on or off, and note that how much weight it gets varies by pattern and by source.

Context matters as much as shape. The same pattern means something different after a long trend than in the middle of a choppy range, close to a major level than in open space, or on a chart with too little trading to show a real contest between buyers and sellers.

Textbook patterns vs live charts

Diagrams, including the one on this page, show clean lines and level boundaries. Live charts rarely look like that. Shoulders are uneven, peaks don't quite match, boundaries slope, and the shape often only becomes clear in hindsight. ChartSchool notes, for instance, that symmetrical shoulders are preferred in a head and shoulders but aren't an absolute requirement.

Two habits help, in TradingLoot's view. First, look at the boundary and the confirmation level rather than how closely the shape matches a picture. Second, check whether you would have seen the pattern before the breakout, or only after it: patterns are much easier to find once you know what happened next.

Pattern families

Patterns are usually grouped by what they are traditionally read as suggesting. The groups are a convention for organizing them, not a promise about direction.

Pattern guides

• Head and Shoulders Pattern

  Three peaks after an uptrend: the neckline, confirmation, the inverse version and how the pattern can fail.

• Double Top and Double Bottom Patterns

  Two similar peaks or lows: the level that confirms them, volume, retests and how the pattern can fail.

• Triangle Patterns

  Ascending, descending and symmetrical triangles: converging boundaries, confirmation and why the breakout can go either way.

• Flag and Pennant Patterns

  Bull and bear flags and pennants: the flagpole, parallel vs converging boundaries, breakouts and how they can fail.

• Wedge Patterns

  Rising and falling wedges: two converging lines sloping the same way, reversal and continuation contexts, confirmation and how breakouts fail.

• Rectangle Patterns

  Trading ranges between horizontal support and resistance: prior trend, breakouts in either direction, confirmation and how they can fail.

• Cup and Handle Pattern

  A rounded cup after an advance and a short handle near the rims: confirmation levels, volume and how the pattern can fail.

• Triple Top and Triple Bottom Patterns

  Three comparable peaks or lows after a trend: choosing the confirmation level, volume and how confirmations can fail.

Reversal patterns

Shapes read as a possible end to the trend before them, such as head and shoulders and double tops and bottoms.

Continuation patterns

Pauses read as a possible rest within a trend, such as flags and pennants.

Patterns that can break either way

Shapes such as triangles. As our summary of Bulkowski's encyclopedia explains, a shape's name doesn't fix the direction of its breakout.

Probabilities and limits

You'll find many claims online that a pattern "works" a certain percentage of the time. TradingLoot doesn't publish success rates. Results depend on how a pattern is defined, the market, the period studied and how a break is measured, so a single number can mislead.

The same caution applies to price targets. A common convention projects the height of the pattern from the breakout; Bulkowski calls this a measure rule for the minimum move. ChartSchool is clear about its status: "Any price target should serve as a rough guide, and other factors should also be considered." A target is a reference point, not a forecast.

If you want to see how patterns have been measured, our summary of Bulkowski's research covers why failure counts as data and how to read pattern statistics. To practise spotting patterns without risking money, see historical replay.

Books on chart patterns

• Encyclopedia of Chart Patterns by Thomas Bulkowski: patterns measured by how they have performed and failed.
• Technical Analysis of the Financial Markets by John J. Murphy: a broad foundation in which price patterns are one of many tools.
• Technical Analysis Books: more books grouped by what you want to learn.

Key takeaways

• A chart pattern records what buyers and sellers have done; it doesn't predict what they'll do.
• Read the prior trend first: a reversal pattern needs something to reverse.
• A shape isn't a pattern until price breaks its boundary convincingly.
• Confirmed patterns can still fail, so decide in advance where the reading would be wrong.
• Treat volume and price targets as guides, not guarantees.
• Live patterns are messier than diagrams, and easier to see in hindsight.