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Harmonic Patterns

Harmonic patterns are price structures whose swings fit specific Fibonacci ratios, such as the Gartley, Bat, Butterfly and Crab. Most have five points (X, A, B, C, D), and the final point marks a potential reversal zone for entries, stops and targets.

Harmonic trading takes Fibonacci ratios further than single retracements. It looks for whole sequences of swings — a move, a retracement, another move — whose proportions match set ratios. When they line up, the pattern points to a precise zone where price may reverse. This entry explains the idea, the common patterns and the risks of trading them.

Category
Technical Analysis
Reading time
4 min
Also called
Harmonic trading, Harmonic chart patterns, XABCD patterns
Updated

Harmonic patterns in plain words

The concept goes back to H.M. Gartley, who described a five-point pattern in 1932; Larry Pesavento and Scott Carney later refined it with Fibonacci ratios.1

The theory holds that price swings follow Fibonacci ratio relationships and symmetry, and the patterns are built from those retracement and projection legs.1

The ratios used — such as 38.2%, 50% and 61.8% — come from the Fibonacci sequence.2

How to trade a harmonic pattern, step by step

  1. Find the XA leg

    A clear initial move. See Swing High and Swing Low.

  2. Measure AB

    Its retracement of XA defines the pattern type.

  3. Measure BC

    A retracement of AB.

  4. Project CD

    Ratios point to where D should complete.

  5. Mark the reversal zone

    Where several ratios cluster. See Potential Reversal Zone.

  6. Plan the trade

    Enter near D, stop beyond it, target back toward C.

Worked examples

Example 1 — A bullish Gartley's B point

B ≈ $107.64

X = $100, A = $120. The Gartley's B retraces about 61.8% of XA.

Example 1 — A bullish Gartley's B point — calculation
XA$20
B$120 − 0.618 × $20 ≈ $107.64

Harmonic patterns define their legs by Fibonacci retracements of earlier swings.1

Example 2 — The D point

Buy zone ≈ $104

In the same Gartley, D completes near the 78.6% retracement of XA.

Example 2 — The D point — calculation
D$120 − 0.786 × $20 ≈ $104.28

The final point marks the potential reversal zone where the bullish pattern is expected to turn up. See Gartley Pattern.

Example 3 — Trade plan

≈ 1.6 : 1

Buy at $104.30, stop at $99.50 (below X), first target $112.

Example 3 — Trade plan — calculation
Risk$104.30 − $99.50 = $4.80
Reward$112 − $104.30 = $7.70
Reward-to-risk≈ 1.6 : 1

Harmonic patterns aim to define entries, stops and targets precisely.1

Common harmonic patterns

AspectB retracement of XAD location
Gartley≈ 61.8%≈ 78.6% of XA
Bat38.2%–50%≈ 88.6% of XA. See Bat Pattern
Butterfly≈ 78.6%Beyond X. See Butterfly Pattern
Crab38.2%–61.8%Far beyond X. See Crab Pattern

How traders use harmonic patterns

  • Reversal entries

    Buying or selling at point D. See Reversal.

  • Precise stops

    Just beyond the pattern's invalidation level. See Stop Loss.

  • Targets

    Retracements of the CD leg.

  • Any market

    Fibonacci analysis works on any market and time frame.1

Advantages and disadvantages

Advantages

  • Defines entry, stop and target in advance.
  • Objective ratio rules.
  • Works across markets and time frames.

Disadvantages

  • Complex and easy to misdraw.
  • Many near-miss patterns.
  • Ratios are approximations; tolerance varies.

Going deeper

Read as far as you need. Each level builds on the one before it.

M and W shapes

Beginner

The Gartley is a five-point pattern that resembles an M or W, defined by five key pivot points.1

Reversal zones, not points

Intermediate

Because several ratios rarely land on one exact price, traders treat D as a zone and wait for price to react. See Potential Reversal Zone.

Testing matters

Advanced

With many pattern variants and ratio tolerances, it is easy to fit patterns in hindsight. Record live results before trusting them. See Sample Size and Statistical Significance.

Common mistakes

  1. Forcing the ratios

    Near enough is not always good enough.

  2. Entering before D completes

    The pattern may extend.

  3. No stop beyond X

    Invalidation must be clear.

  4. Ignoring trend context

    Counter-trend patterns fail more often.

Check your understanding

Test yourself before moving on. Each answer comes with an explanation.

Q1XA runs from $50 to $70. Where is a 61.8% retracement for B?
Q2Who first described the five-point pattern behind harmonic trading?

Key points to remember

  1. Harmonic patterns are swing structures with Fibonacci ratios.
  2. Most use five points: X, A, B, C, D.
  3. Point D marks a potential reversal zone.
  4. Common types: Gartley, Bat, Butterfly, Crab.
  5. Precision helps planning but ratios are approximate.

Frequently asked questions

Are harmonic patterns reliable?

They give precise plans, but like all patterns they fail regularly; risk control is essential.

Do harmonic patterns work in forex?

Yes, they are popular with forex traders, as Fibonacci analysis works on any market.

What is the easiest harmonic pattern?

The ABCD pattern, a four-point structure that forms the base of the others.

Further learning

Sources

This article is written in our own words. The sources below support the specific facts, rules and figures marked with a number in the text. Links open the original publisher’s page.

  1. StockCharts ChartSchool. Harmonic Patterns (opens in a new tab) Checked .
  2. StockCharts ChartSchool. Fibonacci Fans (opens in a new tab) Checked .

Read more elsewhere

Educational content, not financial advice. Examples use hypothetical prices and simplified costs; actual fees, margin rules and regulations vary by broker, market and country. Trading Metrics is our sister site, under the same ownership; we are not affiliated with any other publisher linked above. Last reviewed . Report an error or request a source credit.