Harmonic Price Patterns in Forex: Gartley, Butterfly, Bat, and Crab Explained

FX EditorialFX Editorial 2. 4. 2026

Harmonic patterns have specific Fibonacci ratios that must be met, or the pattern is invalid. That mathematical precision is what separates them from subjective chart patterns like head and shoulders or triangles. A valid Gartley pattern requires a B-point retracement of exactly 0.618, not "roughly 60%." This strictness filters out noise and produces some of the highest-probability trade setups in forex.

Originally described by H.M. Gartley in 1932 and later refined by Scott Carney in the late 1990s, harmonic patterns use Fibonacci retracement and extension levels to identify potential reversal zones (PRZs) where price is likely to turn. We've traded these patterns across major forex pairs for years, and their accuracy, when the ratios align correctly, is consistently above what most other pattern-based approaches deliver.

The Foundation: Fibonacci Ratios You Must Know

Before diving into specific patterns, you need these Fibonacci levels committed to memory:

These are not arbitrary numbers. Each one is derived mathematically from the Fibonacci sequence, and markets respect them because they reflect natural proportions found in price swings driven by crowd behaviour.

The XABCD Structure

Every harmonic pattern consists of five points labelled X, A, B, C, and D. These points define four price legs:

Point D is where you trade. It is the Potential Reversal Zone (PRZ). The entire purpose of identifying the pattern is to anticipate where D will form so you can enter a trade at that level before the reversal begins.

The Gartley Pattern (222 Pattern)

The Gartley is the original harmonic pattern and remains the most commonly traded.

Fibonacci Requirements

How to Trade It

The key ratio is the D-point completion at the 0.786 retracement of XA. This is a deep retracement that tests the original move without breaking the X point.

In practice: if EUR/USD starts a move at 1.0800 (X) and rallies to 1.1000 (A), the B-point should form near 1.0876 (0.618 retracement of the 200-pip XA leg). After B, price moves back up to form C, then declines to D near 1.0843 (0.786 retracement of XA). You enter long at D with a stop below X at 1.0790.

The target is typically the A-point (1.1000) or the 0.618 retracement of the AD leg for a conservative take-profit.

In our experience, the Gartley produces win rates of approximately 60-65% when the 0.618 B-point ratio is precise (within 2-3 pips). If B overshoots significantly, the pattern degrades and should be avoided.

The Butterfly Pattern

The Butterfly extends beyond the starting X point, which makes it a more aggressive pattern than the Gartley.

Fibonacci Requirements

Key Distinction

Unlike the Gartley, where D stays within the XA range, the Butterfly's D point exceeds the X level. This means the pattern completes at an extension, not a retracement. You are buying (or selling) at a level beyond the original extreme.

A bearish Butterfly on GBP/USD might look like this: price drops from 1.2700 (X) to 1.2500 (A), retraces up to 1.2657 (B at 0.786 of XA), pulls back to C, and then rallies above X to complete D at 1.2755 (1.272 extension of XA). You sell at D with a stop above the 1.618 extension of XA at 1.2823.

The Butterfly works particularly well at the end of extended trends where price makes one final push beyond a key level before reversing sharply.

The Bat Pattern

Developed by Scott Carney in 2001, the Bat pattern uses the 0.886 retracement at point D, making it the deepest retracement harmonic that stays within the XA range.

Fibonacci Requirements

Why Traders Favour It

The Bat's shallow B-point (0.382-0.500 vs. the Gartley's 0.618) combined with the deep D-point (0.886 vs. the Gartley's 0.786) creates a distinctive structure. The pattern gives you a very tight stop-loss placement just beyond the X point while offering substantial profit targets.

If USD/JPY moves from 148.00 (X) to 150.00 (A), B forms around 149.00-149.20 (0.382-0.500 retracement). After the BC leg, D completes near 148.23 (0.886 retracement of XA). Your stop goes below X at 147.90, giving you a 33-pip risk for a potential move back to A at 150.00 -- a reward of 177 pips. That is a 5:1 reward-to-risk ratio.

We've observed that the Bat pattern produces the best risk-reward profile of all four major harmonics. It is the pattern we look for first when scanning charts.

The Crab Pattern

The Crab is the most extreme harmonic pattern. Its D-point uses the 1.618 extension of XA, placing the reversal zone far beyond the starting X point.

Fibonacci Requirements

When It Appears

The Crab typically forms at major market turning points. Because D extends to 1.618 of XA, it represents a significant overextension that is ripe for a sharp reversal. The pattern is less common than the Gartley or Bat, but when it appears with precise ratios, the reversal tends to be violent.

Scott Carney, who identified this pattern, has stated that the Crab is the most accurate of all harmonic patterns when the 1.618 XA extension is hit precisely. In our experience, this holds true, though the lower frequency means you get fewer opportunities.

On EUR/GBP, a Crab pattern completion at the 1.618 extension in November 2024 produced a 150-pip reversal within 48 hours. The pattern is rare but powerful.

How to Validate Harmonic Patterns

Finding a five-point structure on a chart is easy. Finding a valid harmonic pattern is hard. Here is how you filter out noise:

Step 1: Check Every Ratio

Each Fibonacci ratio must fall within the defined range. If B retraces 0.680 of XA, it is not a Gartley (which requires 0.618). Do not force patterns to fit. If the ratios are off, move on.

Step 2: Look for Confluence at Point D

The best harmonic trades occur when the D-point aligns with another technical level. If the Bat's 0.886 retracement of XA lands right at the 200-day moving average, you have confluence from two independent methods. That dramatically increases the probability of a reversal.

Other confluence factors include:

Step 3: Wait for a Trigger Candle

Do not blindly place limit orders at D. Wait for price to reach the PRZ and then show a reversal signal: a pin bar, engulfing candle, or doji. This confirmation reduces the times you enter a trade only to watch price blow through D and continue trending.

Step 4: Manage the Trade

Common Mistakes with Harmonic Patterns

Forcing patterns. If B is at 0.550 instead of 0.618, it is not a Gartley. Traders who stretch the rules end up trading random chart shapes, not harmonics.

Ignoring the trend. A bullish Gartley that forms within a strong daily downtrend is significantly less reliable than one forming in the direction of the prevailing trend. Always check the higher timeframe.

No stop loss. Because D is the anticipated reversal point, some traders assume it "must" reverse and skip the stop loss. It does not always reverse. The 0.786 retracement can become a break of X, and you need to be out before that happens.

Trading every pattern. Not all valid patterns are worth trading. The best setups have confluence, clean structure, and form on the 1-hour chart or higher. Harmonic patterns on the 5-minute chart tend to be noisy and unreliable.

Tools and Software

Manually measuring every Fibonacci ratio on every chart is impractical. Several tools can help:

Even with automated detection, always verify the ratios manually before trading. Software catches visual patterns but does not always measure ratios with the precision that harmonic trading demands.

Combining Harmonics with Other Analysis

Harmonic patterns do not exist in isolation. The highest probability setups combine harmonic D-point completions with:

In our experience, a harmonic pattern at a major moving average level with RSI divergence is one of the most reliable setups in all of technical analysis. These triple-confluence trades produce win rates above 70% in our tracking.

Key Takeaways

Harmonic patterns are not magic. They are a structured, Fibonacci-based method for identifying high-probability reversal zones. The Gartley (0.786 D-point) and Bat (0.886 D-point) stay within the XA range and offer clean risk-reward setups. The Butterfly (1.272-1.618 D-point) and Crab (1.618 D-point) extend beyond X and catch extremes.

Precision is non-negotiable. Verify every Fibonacci ratio, look for confluence at D, wait for a trigger candle, and always use a stop loss. Master one pattern first, then expand your repertoire. The Bat pattern, with its excellent risk-reward profile, is a strong starting point.

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