Gartley Complete Guide

What is Gartley?

The Gartley is a five-point harmonic reversal pattern built on specific Fibonacci ratios that connect four price legs labeled X-A-B-C-D. It originates from the work of H.M. Gartley and was later formalized with precise ratio definitions by analysts such as Scott M. Carney and Larry Pesavento. The pattern exists in both a bullish variant, which forms after a decline and points to a potential upward reaction at point D, and a bearish variant, which forms after an advance and points to a potential downward reaction at point D. Both variants share the identical geometric blueprint, only mirrored in direction. The defining measurements are strict. The B point must retrace 0.618 of the initial XA leg, which is the structural signature that separates a Gartley from other harmonic shapes. The BC leg then projects forward by a factor of 1.13 to 1.618, and the final CD leg completes so that point D sits at the 0.786 retracement of the entire XA leg. Because D terminates inside the XA range rather than beyond it, the Gartley is considered a relatively conservative harmonic pattern, with the potential reversal zone nested within the prior swing. For students of technical analysis, the Gartley illustrates how Fibonacci relationships can be used to anticipate where a corrective structure may complete. The 0.786 completion at D often aligns with prior support or resistance, and analysts typically look for confirming candlestick or momentum behavior at the potential reversal zone before drawing conclusions. The pattern should be studied alongside trend context, volume, and confluence with other levels, rather than treated as a self-contained signal.

Technical analysis taxonomy: Trend, Momentum, Volatility, Volume, Key Levels, Patterns, Signals, Advanced Structure.

Market Psychology

The Gartley pattern encodes a recurring psychological rhythm of trend, correction, and exhaustion expressed through Fibonacci proportion. The initial XA leg represents the dominant impulse, after which the AB correction retraces a measured 0.618 as early counter-trend participants take profits and opposing interest builds. The BC and CD legs reflect a final struggle in which the prevailing trend makes one more attempt to extend, drawing in late participants, before stalling at the 0.786 completion of XA. Scott M. Carney (2010) describes the potential reversal zone as the area where the structural completion of multiple Fibonacci measurements converges, often coinciding with depleted conviction on the part of the trend's followers. Larry Pesavento (1997) emphasizes that the precision of the 0.618 and 0.786 ratios reflects how crowd behavior tends to cluster around these proportional levels, where prior buyers or sellers reassess and where the balance of supply and demand can shift. The completion at D, nested within the XA swing, signals that the corrective effort has reached a natural mathematical boundary, and analysts watch for evidence that conviction behind the move is fading before anticipating a reaction.

Formation Context

A Gartley develops within a defined swing structure rather than in random, choppy price action, and it is most instructive when the XA leg represents a clear directional move. According to John J. Murphy (1999), Fibonacci retracements are most reliable when measured against well-defined prior swings, and the Gartley applies this principle across four sequential legs. In the bullish case, the pattern typically appears during a corrective pullback within or at the end of a larger structure, with X marking a high, A a low, and the subsequent B-C-D oscillation building toward a completion that often tests a prior support shelf. Scott M. Carney (2010) stresses that the alignment of multiple Fibonacci numbers at the potential reversal zone is what gives the structure its analytical weight; the 0.786 completion of XA frequently overlaps with horizontal support or resistance, moving averages, or prior pivot points, creating confluence. Because D remains inside the XA range, the Gartley tends to form in markets that are correcting rather than making new extremes, distinguishing its formation context from extension patterns such as the Butterfly or Crab, where D projects beyond X.

Identification Rules

1. The pattern consists of four connected price legs forming five pivot points labeled X, A, B, C and D in sequence.
2. Point B retraces approximately 0.618 of the XA leg — this 0.618 retracement is the defining ratio of the Gartley.
3. The BC leg projects to between 1.13 and 1.618 of the BC swing, keeping the structure within harmonic tolerances.
4. Point D, the completion of the CD leg, terminates at the 0.786 retracement of the entire XA leg, forming the potential reversal zone.
5. D should remain inside the XA range; if price extends beyond X, the structure is invalidated as a Gartley and may instead resemble a Butterfly or Crab.

Common Mistakes

• Treating any approximate ABCD zigzag as a Gartley without verifying that B retraces precisely near 0.618 of XA and D completes near 0.786 of XA, ignoring Carney's (2010) insistence on ratio precision.
• Confusing a Gartley with a Bat by failing to check the B-point depth; a B near 0.382 to 0.50 indicates a Bat, not a Gartley, and this changes the expected completion level.
• Anticipating a reaction at D mechanically without waiting for confirming price behavior, whereas Pesavento (1997) frames the potential reversal zone as an area to monitor rather than an automatic trigger.
• Allowing point D to extend beyond X and still labeling the structure a Gartley, when a D that exceeds the XA range invalidates the Gartley and points instead toward an extension pattern.
• Ignoring the broader trend and surrounding support or resistance, so that the Fibonacci geometry is read in isolation rather than as confluence with conventional chart levels as Murphy (1999) recommends.

Educational Notes

The Gartley is one of the foundational harmonic patterns and is frequently used to teach how Fibonacci ratios can be combined across multiple price legs. Its modern definition, codified by Scott M. Carney (2010) and informed by the earlier work of Larry Pesavento (1997), specifies B at 0.618 of XA, a BC projection of 1.13 to 1.618, and completion at the 0.786 retracement of XA. Because point D nests inside the original XA swing, the Gartley represents a comparatively conservative member of the harmonic family, distinct from extension patterns whose completion projects beyond X. Students should note that the pattern is symmetrical: the bullish and bearish forms are mirror images sharing identical ratios. As with all chart structures, John J. Murphy (1999) reminds analysts that geometric patterns gain reliability when read in the context of trend, volume, and confluence with established support and resistance, rather than as isolated mechanical triggers. The Gartley is best studied as a framework for anticipating where a correction may complete, with the potential reversal zone serving as an area to monitor for confirming evidence.

Related Patterns

References

• Scott M. Carney (2010). Harmonic Trading.
• Larry Pesavento (1997). Fibonacci Ratios with Pattern Recognition.
• John J. Murphy (1999). Technical Analysis of the Financial Markets.

More Analysis