Harmonic Chart Patterns for Forex Trading

Summary, what makes a harmonic pattern

• Harmonic patterns are five-point geometric structures (X, A, B, C, D) defined by specific Fibonacci retracement and extension ratios.
• They give the cleanest entry, stop and target maths in pattern trading because every leg has a measured ratio.
• Seven patterns dominate AU charts: Gartley, Bat, Butterfly, Crab, Cypher, Shark and ABCD.
• Used as either bullish or bearish setups depending on which direction the structure resolves at point D (the entry).
• Most easily detected with Autochartist or a dedicated harmonic indicator on MT4, MT5 or TradingView.

For the wider context on chart pattern families, see the chart patterns pillar.

How harmonic patterns work

Every harmonic pattern starts at point X. Price moves to A, retraces to B, swings to C, then completes the structure at D. The ratios between these points are what separate one harmonic from another.

The two Fibonacci numbers that matter most: 0.618 (the golden ratio retracement) and 1.618 (the inverse, used as an extension). Other ratios (0.382, 0.5, 0.786, 0.886, 1.13, 1.27, 1.414, 2.0, 2.24, 3.14) appear at specific points in specific patterns.

Point D is where the trade is entered. The trader takes the trade in the opposite direction of the C-to-D leg, expecting price to reverse from D back toward C and beyond. The stop goes a small distance beyond D. The first target is usually 0.382 of the AD leg. The second target is 0.618 of the AD leg.

Harmonic patterns can be either bullish (price moves down to D, then trader buys) or bearish (price moves up to D, then trader sells). The geometry is identical. Only the direction reverses.

The seven harmonic patterns

Gartley

The original harmonic, named for H.M. Gartley’s 1935 book “Profits in the Stock Market”.

Fibonacci ratios:

• B retraces XA at 0.618
• C retraces AB between 0.382 and 0.886
• D extends BC between 1.27 and 1.618
• D retraces XA at 0.786

Signal. Long (or short) entry at point D, in the direction opposite the CD leg. Stop a small distance beyond D, typically at the 1.0 retracement of XA (which would invalidate the pattern). First target at 0.382 of AD. Second target at 0.618 of AD.

Common mistakes. Trading “almost” Gartleys where D doesn’t hit the 0.786 retrace. The 0.786 level is what makes the Gartley what it is. Loose ratios produce loose results.

Bat

Developed by Scott Carney in 2001. Tighter than the Gartley.

Fibonacci ratios:

• B retraces XA between 0.382 and 0.5
• C retraces AB between 0.382 and 0.886
• D extends BC between 1.618 and 2.618
• D retraces XA at 0.886

Signal. Same logic as Gartley but D sits at the deeper 0.886 retrace of XA. Entry at D, stop just beyond, target at 0.382 then 0.618 of AD. The deeper D level often gives a tighter stop and a better risk-to-reward than the Gartley.

Common mistakes. Confusing a Bat with a Gartley. The B retrace is the key tell: 0.382 to 0.5 means Bat. 0.618 means Gartley. Mislabel the pattern and you’ll project the wrong D level.

Butterfly

Identified by Bryce Gilmore. Distinguished by D extending beyond X.

Fibonacci ratios:

• B retraces XA at 0.786
• C retraces AB between 0.382 and 0.886
• D extends BC between 1.618 and 2.24
• D extends XA between 1.27 and 1.618 (D is beyond X)

Signal. Entry at D, but unlike Gartley and Bat, D is past the original X point. This makes the Butterfly a stretch pattern, often appearing at the end of an extended move. Stop placement just beyond D. Targets at 0.382 and 0.618 of AD as standard.

Common mistakes. Treating a Butterfly like a reversal pattern at “any” exhausted level. The XA extension at D is what makes it a Butterfly. Without the right ratio, it’s just a price move that’s gone too far.

Crab

Also developed by Scott Carney. Has the deepest D extension in the harmonic family.

Fibonacci ratios:

• B retraces XA between 0.382 and 0.618
• C retraces AB between 0.382 and 0.886
• D extends BC between 2.618 and 3.618
• D extends XA at 1.618

Signal. D sits at a 1.618 extension of XA, well beyond X. Entry at D, stop just beyond. The Crab is favoured for its precise D level (1.618 is one of the most-watched Fibonacci extensions) and the strong reaction price often shows at this point.

Common mistakes. Sizing the stop too tight. Crabs often print after fast moves and the volatility around D can spike a stop placed too close. Give the pattern a small buffer beyond the 1.618 level.

Cypher

A more recent addition to the harmonic family, developed by Darren Oglesbee.

Fibonacci ratios:

• B retraces XA between 0.382 and 0.618
• C extends XA between 1.272 and 1.414 (C is beyond A)
• D retraces XC at 0.786

Signal. The Cypher is unusual because C extends beyond A rather than retracing AB. D is measured off the XC leg, not the XA leg. Entry at D, stop just beyond, target at the 0.382 and 0.618 retracement of CD.

Common mistakes. Drawing the legs incorrectly. Because C extends beyond A, traders new to Cyphers often misidentify the pattern as a failed Bat or Gartley. The C-to-XA ratio is the tell.

Shark

The newest of the major harmonics, also developed by Carney around 2011.

Fibonacci ratios:

• Uses points 0, X, A, B, C (different labelling)
• B retraces XA between 1.13 and 1.618
• C extends XA between 1.13 and 1.414
• The pattern often transitions into a 5-0 pattern after completion

Signal. Entry at C with a stop beyond. The Shark is more aggressive than the older harmonics and often used by traders looking for short-duration reversals at extreme levels.

Common mistakes. Mistaking the Shark for a Crab or Butterfly. The Shark’s distinctive feature is B extending beyond X (rather than retracing inside XA), which is rare in the older harmonics.

ABCD

The simplest harmonic structure. Often used as a building block inside the larger five-point patterns.

Fibonacci ratios:

• AB and CD legs are equal in length and time
• BC retraces AB between 0.618 and 0.786
• CD extends BC between 1.27 and 1.618

Signal. Entry at D, in the opposite direction of CD. The ABCD is the easiest harmonic to spot and the easiest to trade, but the geometry is simpler than the five-point patterns and the strike rate is correspondingly lower without strong context.

Common mistakes. Trading every ABCD that prints. Without higher-timeframe trend confirmation, the ABCD’s strike rate isn’t compelling. Use it as a confluence tool inside larger structures rather than a standalone signal.

How to confirm a harmonic pattern

Harmonic patterns are stricter than classical patterns, so confirmation matters less mechanically and more about context.

Higher-timeframe trend. A bullish Gartley on the 4-hour AUD/USD chart works much better when the daily chart is in a clean uptrend. Trading harmonics against a strong higher-timeframe trend cuts the strike rate sharply.

Fibonacci confluence. When the D point of a harmonic lines up with another Fibonacci level (a major retracement, a previous swing high or low, a round number), the pattern carries more weight. AUD/USD prints high-quality harmonics at the 0.7000 round number more often than at random levels.

Candlestick confirmation at D. A bullish Gartley with a hammer or bullish engulfing candle at D is stronger than one that completes on a doji. The candlestick action at the entry point gives you a real-time reading on whether the reversal is taking hold.

Auto-detection. Autochartist and most TradingView harmonic indicators flag completed harmonics in real time. AU brokers including Pepperstone, IC Markets, FP Markets and Eightcap include Autochartist free with funded accounts. CMC Markets’s Next Generation has its own pattern recognition module that includes the major harmonic patterns.

Risk management for harmonic patterns

Stop placement

The stop on a harmonic pattern goes just beyond point D. The exact distance depends on the pattern:

• Gartley, beyond the 1.0 XA retracement
• Bat, beyond the 1.0 XA retracement
• Butterfly, beyond the 1.618 XA extension
• Crab, beyond the 1.618 XA extension (with a small buffer for volatility)
• Cypher, beyond the 1.0 XC retracement
• Shark, beyond the 1.414 XA extension
• ABCD, beyond the 1.27 to 1.618 BC extension

The stop is small relative to the AD target distance, which is why harmonic patterns often produce risk-to-reward ratios of 3:1 or higher. That asymmetric reward profile is the structural advantage of harmonic trading. Even at strike rates of 50%, the maths work.

Position sizing under the 30:1 cap

Australian retail traders are capped at 30:1 leverage on major forex pairs under ASIC’s Product Intervention Order (in force since 29 March 2021, made permanent). ASIC also requires brokers to be members of AFCA, which provides free dispute resolution to retail clients if anything goes wrong.

A worked example: AUD 10,000 account, 1% risk per trade (AUD 100), bullish Bat pattern on EUR/USD with a 30-pip stop beyond D.

• Risk per trade: AUD 100
• Stop distance: 30 pips
• Position size: AUD 100 / 30 pips = AUD 3.33 per pip = roughly 0.33 standard lots (33,000 units)
• Margin required at 30:1: around AUD 1,200 (within account)
• First target at 0.382 AD: roughly 60 pips = AUD 200 (2:1 RR)
• Second target at 0.618 AD: roughly 90 pips = AUD 300 (3:1 RR)

Harmonic geometry is what makes this maths work. The tight stop beyond D combined with the meaningful AD target distance produces reward-to-risk ratios that classical patterns rarely match.

If you’re trading harmonics on gold (XAU/USD), the leverage cap is 20:1 not 30:1. Adjust your margin calculation. ASIC also mandates negative balance protection and margin close-out at 50% of initial margin, but those are safety nets, not strategy substitutes.