Bat Harmonic Pattern: Rules, Ratios and How to Trade It

The bat harmonic pattern is a five-point retracement pattern, labeled X, A, B, C and D, in which point B retraces only 0.382 to 0.50 of the first move and point D completes at a deep 0.886 retracement of the XA leg, near X. Traders buy (bullish version) or sell (bearish version) at D, with a stop just beyond X.

This guide covers the exact Fibonacci ratios, a worked example with numbers, how to identify and trade the bat pattern step by step, how it differs from the Gartley pattern, and an honest answer to the question that matters before any trade: does it work? We give our own test results, on every market, next to the choices the test required.

What is the bat harmonic pattern?

The bat pattern is one of the harmonic patterns: price structures in which each leg must respect specific Fibonacci ratios. It marks the end of a deep pullback inside a larger move. After a strong first leg from X to A, price retraces to B, bounces to C, then retraces again to D, a level calculated in advance. Traders read D as a potential reversal zone: the place where the pullback should end and the original move resume.

Scott Carney, who coined the term harmonic trading in The Harmonic Trader (1999), defined the bat pattern in 2001 and set out its rules in Harmonic Trading, Volume One (2010). Its key ratio, the 0.886 retracement, sits very near X and leaves little room between the order and the point where the pattern is proved wrong.

How harmonic patterns work in technical analysis

Harmonic trading is a branch of technical analysis based on one idea: price swings tend to repeat in proportions related to the Fibonacci sequence (0.382, 0.618, 0.786, 0.886, 1.27, 1.618 and so on). A harmonic pattern is a sequence of swings that matches a specific set of those Fibonacci ratios. Because the ratios are fixed, each harmonic pattern gives a price level where a reversal is expected before price gets there. Traders read the bat, the Gartley, the Butterfly and the Crab as harmonic variations of the same idea, each with its own ratios. Unlike classic chart patterns such as the double bottom, which are read from their shape, harmonic setups are read from their proportions.

The geometry behind the bat pattern

On a chart, a bullish bat pattern looks like an M: up from X to A, down to B, up to C, and a long drop to D, just above X. A bearish bat pattern looks like a W, the mirror image. The shape is close to the Gartley, with a shallower B and a deeper D.

The importance of the XABCD structure

The bat shares the X, A, B, C and D frame of the other harmonic patterns described in our XABCD guide. On that frame, the position of point B and the depth of point D decide which harmonic pattern you are looking at, each with specific ratios. Inside it sits an AB=CD pattern: the last three legs, in which the CD leg is longer than AB, about 1.27 times.

Fibonacci ratios and the bat pattern

The 0.886 Fibonacci retracement of XA is the defining level. The other Fibonacci levels (the BC extension and the extended AB=CD) rarely land on the exact same price: together they form the potential reversal zone (PRZ). The tighter the cluster, the cleaner the bat pattern.

Bullish vs. bearish bat patterns

Both versions follow the same Fibonacci ratios; only the direction changes. Bullish bat patterns are buy signals at D, bearish ones are sell signals. The trade at D always follows the direction of the first leg.

Identifying a bullish bat pattern

A bullish bat forms after a strong rise, as a pullback in an uptrend. X is a swing low, A a high, B a shallow pullback, C a lower peak, and D a deep pullback that ends just above X. You buy at D, expecting price to resume its rise toward C and A.

Identifying a bearish bat pattern

A bearish bat pattern forms after a strong decline, as a bounce inside a downtrend. X is the top, A the bottom of the first move, B a small bounce, C a second dip, and D a rally that ends just below X. You sell at D. The figure below shows the bearish bat pattern.

How to identify a valid bat pattern on your charts

Mark the five swing points first, then check each ratio in order. If one measure fails, it is not a bat: it may be another harmonic pattern, or no pattern at all. The anatomy chart in this section is the median shape of real daily setups from all markets (every usable setup, or a random sample when their number exceeds a cap, as its caption says); every setup has the same five points.

Step 1: locating the X point and leg XA

Mark a clear swing (X) and the opposite swing that follows (A). The XA leg has no required size, but it should be a strong, clean move that stands out on the chart. Every later Fibonacci ratio is measured from it.

Step 2: validating the B point retracement

Draw a Fibonacci retracement on XA. Point B must sit between the 0.382 and 0.50 levels. A B at 0.618 points to a Gartley, a B at 0.786 to a Butterfly. A B under 0.382 is the signature of the alternate bat, in which D completes beyond X, at 1.13 of XA.

Step 3: confirming the C point

Point C must retrace 0.382 to 0.886 of AB, and it never goes beyond A. If C goes past A, the pattern turns into something else, such as the Cypher or the Shark.

Step 4: finding the potential reversal zone (PRZ)

Calculate D at the 0.886 Fibonacci retracement of the XA leg. Then check the CD leg: it should extend 1.618 to 2.618 times BC, and be about 1.27 times AB. The potential reversal zone (PRZ) is the small area where these Fibonacci levels cluster. D never goes beyond X: if it does, the bat is invalid.

A worked example with numbers

Illustrative values, not a real chart. For a bullish bat, X is at 100 and A at 150, so the XA leg is 50. B stops at 125, a 0.50 retracement, inside the range. C bounces to 140: BC is 15, or 0.60 of AB. D at the 0.886 retracement is 150 minus 44.3, which is 105.7. Check the last move: from 140 to 105.7 is 34.3, or 2.29 times BC (inside 1.618 to 2.618) and 1.37 times AB. A 1.27 AB=CD would end at 108.3, so the reversal area runs from 105.7 to 108.3. The order waits there, and the pattern is invalid below 100.

Bat vs. Gartley: key differences

The bat and the Gartley pattern share the same frame, and both end inside the first move, so X stays near and limits the risk. B and D tell them apart.

Of the two retracement patterns in the table, the ones that end inside the XA leg, the bat has the shallower B and the deeper D. In the example above, with point X at 100 and point A at 150, a Gartley pattern would complete at 110.7, five points higher than the bat at 105.7. That deeper D gives the bat a tighter exit: the distance to X is 0.114 of XA, against 0.214 for the Gartley pattern. The two extension patterns end beyond X and need another exit rule.

The alternate bat pattern

The alternate bat is a specific variation defined by Scott Carney for structures with a shallow B. Point B retraces less than 0.382 of XA, and point D completes beyond X, at the 1.13 extension of XA, with a BC projection of 2.0 to 3.618. Because D goes past X, the classic exit at X no longer works: the pattern needs a stop beyond D, set from the next Fibonacci level, as with extension patterns.

How to draw the bat pattern with a Fibonacci tool

Charting platforms such as TradingView let you check every ratio with two tools: the Fibonacci retracement tool and the XABCD tool. A simple routine for a bullish bat pattern:

1. Draw the Fibonacci retracement from point X to point A. Read the price at the 0.382, 0.50 and 0.886 levels.
2. Check that point B sits between the 0.382 and 0.50 price levels.
3. Draw a second retracement from point A to point B, and check that point C sits between its 0.382 and 0.886 levels.
4. Use the extension tool on BC to read the 1.618 and 2.618 projections, and mark the price where CD equals 1.27 times AB.
5. Mark the 0.886 price of XA as D, and the spread of the other levels around it as the reversal area.

Then draw the XABCD tool on the five swing points: it shows each ratio on the chart and makes a precise check of the pattern easy to share and review later.

How to trade the bat harmonic pattern

The appeal of harmonic patterns is that the entry, the exit and the targets are all known before price reaches D.

Strategic entry points at the PRZ

There are two common entries. The aggressive one places a limit order at the 0.886 retracement, or splits the order between that retracement and the 1.27 AB=CD price. The careful one waits for price action at D: a candlestick such as a hammer or an engulfing, or the break of a small trendline on a lower timeframe. Keep in mind what our bench found on those candles alone: on 12,005 closed trades on daily hammers, the 2:1 trade reached its target 35.4% of the time against 36.1% for the same trade on random dates, a difference rated No clear edge: its average result per trade (+0.06 R against +0.09 R) does not pass our statistical test. A confirmation candlestick adds information, not certainty, and it moves the order further from X.

Setting your stop loss for risk management

Defining profit targets for the bat pattern

The targets used here are the 0.382 and 0.618 retracements of the move from A to D, then C, then A. With the values above, AD is 44.3: the first target is 122.6, the second 133.1, then C at 140. Buying at 105.7 with an exit just below 100 risks about 5.7, so the first target pays about 3 times the risk and the second about 4.8 times. One way to manage the trade is to close part of it at the first target and move the stop to breakeven.

Trading strategy: a full plan in one table

Size each trade on the distance between your entry and X, and risk only a small, fixed share of your trading account.

Our bench tests one standardized version of this trade, with the same entry and target rules for every harmonic pattern so that results can be compared, and this pattern's own stop: no limit order, but an entry at the close of the first bar that reaches the reversal zone, a stop at X and a target at twice the risk. The 0.618 retracement of AD, the second target above, is measured separately.

Essential tips for trading the bat pattern

Seeking confluence with indicators

Harmonic traders look for a D that lines up with other levels: prior support and resistance levels, a round number, a trendline. A momentum filter, such as RSI divergence at D, is another option. We have not tested those filters. We did split the bat by trend: on daily charts, 376 bullish setups formed above the 200-day moving average and 1,179 below it; of the closed 2:1 trades on them, 38.6% reached the target in the first group, against 38.3% in the second. The few other bullish setups formed too early in an asset's history to have a 200-day average, so they are in neither group. That split is descriptive: we did not test it against random dates or correct it for multiple testing.

Avoiding common mistakes in harmonic trading

• Forcing the ratios: the bat needs precise ratios. Calling a pattern a bat with B at 0.618 is a mistake. That is a Gartley, with another D.
• Acting before D: the bat is only complete at D.
• Moving your exit: once price passes X, the pattern is invalid. Moving the exit to keep the trade alive can turn a small loss into a large one.
• Ignoring the larger trend: a bullish bat in a market making lower lows on the weekly chart fights that trend.
• Remembering only the winners: on past charts, the patterns that worked are easy to see. Keep a record of every one you would have traded.

The role of market psychology

In harmonic terms, the bullish bat describes an advance that pauses in two waves. Early buyers take profits at A; new buyers push price up again at C but fail to reach A. A second, deeper wave of selling then takes price almost back to X, where the move started. Traders waiting at D bet that X still holds. Whether the 0.886 retracement captures that behavior better than any other pullback is a question for data, not for the story.

Is the bat pattern reliable?

Detecting a harmonic pattern without judgment requires choices, and we set ours from chart reviews, never from results. Turning points are swings of 2, 4 or 8 times the average true range. X must be a true turning point: over as many bars as XA took, before X, price never went more than 10% of XA beyond it. A ratio published as a single value is accepted within 5% of it (0.886 becomes 0.842 to 0.930), and a published range, such as 0.382 to 0.50 for B, is used as is. Once C is confirmed, the reversal zone is where the 0.886 retracement of XA overlaps the 1.618 to 2.618 projection of BC; the bench uses these two measures only, not the 1.27 AB=CD price. The signal is the first bar that trades into the zone without trading below X.

On 1,561 closed trades on bullish setups on daily charts, all markets together, the 2:1 trade reached its target 38.3% of the time, against 36.4% for the same trade on random dates. On 1,775 trades on bearish setups, it was 28.5% against 28.2%. Neither gap passes our statistical test: on daily charts, the bat trade did no measurably better than chance. The 0.618 retracement of AD was reached before the stop, within 100 bars, in 32.1% of bullish daily setups and 20.8% of bearish ones. Those rates have no random baseline and are not in the tables: they describe the shape, not an edge. Be careful with any success rate quoted without the detection rule, the data, and a comparison with chance.

What the bench measured

Every occurrence our strict rule detected on full price history (it misses some real bats, especially on choppy markets such as crypto), in crypto, forex, US stocks, ETFs, indices and commodities, compared with the same trade placed on random dates on the same assets.

Read each row in pairs: the setup against the same trade on random dates. On every timeframe, all markets together, the 2:1 trade showed no measurable difference from chance in either direction. The direction of price 10 bars later tells a different story on weekly charts: 69.4% of bullish setups were higher 10 weeks later, against 57.0% for random weeks, an average excess return of +3.14% rated Promising: it passes a simple test but not our correction for multiple testing. It rests on 208 setups, 191 of them on US stocks, so treat it as a result to check on your own market: stock data misses most delisted companies, a survivorship bias we have not sized. On hourly charts, bearish setups had a small excess return (+0.17%) that passes a simple test but not our correction. Where a market has fewer than 30 occurrences on a timeframe, the bench shows the numbers but does not interpret them. The method is published in our methodology.

Advantages and disadvantages of the bat pattern

Benefits of using harmonic patterns

• The whole plan (entry, exit, objectives) is written before the trade, which makes losses easy to control.
• X is very near D, so the potential reward can be large compared with the risk.
• Once the swing points are chosen, the ratios leave little room for interpretation: two traders who agree on X, A, B and C get the same D.
• The rules are the same on stocks, currencies and crypto, on every timeframe.

Risks and limitations to consider

• A tight exit is hit more often, including by noise.
• Perfect harmonic patterns are rare, and it is tempting to stretch the ratios to find more.
• Choosing X and the other swings is a judgment call, so two traders may label them differently.
• A limit order at D buys a falling price, before any sign of a turn.
• Our own test of the bat, with a fixed rule, found no clear edge over chance for the 2:1 trade, on any timeframe.

Tools to find the bat harmonic pattern

• XABCD drawing tool: TradingView includes one that shows the harmonic ratios as you click.
• Scripts and indicators: the TradingView community library, MetaTrader, cTrader and NinjaTrader all have scripts that detect harmonic patterns automatically. Check which ratios and tolerances each one uses: two tools can mark different bat patterns on the same chart.
• Harmonic scanners: paid services scan many assets for chart patterns and send alerts when a bat completes. Test them on past data before paying.

Whatever the tool, practice first on a demo trading account: mark the last completed bat patterns on your market, write the plan for each, and record the outcome.

Frequently asked questions

Summary

• B at 0.382 to 0.50 of XA, C at 0.382 to 0.886 of AB, D at 0.886 of XA, with CD at 1.618 to 2.618 of BC.
• Entry at D, stop just beyond X, profit levels at the 0.382 and 0.618 retracements of AD, then C and A.
• A shallower B and a deeper D separate it from the Gartley pattern.
• Tested on our bench with a fixed rule: all markets together, the 2:1 trade showed no measurable difference from chance on any timeframe, in either direction, and no 10-bar move survives our correction either; the closest is the 10-bar move of bullish setups on weekly charts, rated promising on a small sample of 208 setups.

This guide is general information about technical analysis, not financial or investment advice. Trading carries a risk of loss: never trade money you cannot afford to lose.

About the author and the data. Written by Amaury, founder of PatternsWizard, who is passionate about finance, quantitative trading and data analysis. He built the PatternsWizard test bench, which detects each pattern with fixed, published rules on full market history: crypto, forex, US stocks, ETFs, indices and commodities. Trades and win rates are compared with random bars on the same assets, excess returns with the rest of the market, with error margins and a correction for multiple testing, and the whole pipeline is checked on random-walk prices, where nothing can be predicted. The bat rule (swings of 2, 4 or 8 times the average true range, ratios within 5%) was set from chart reviews, never tuned on results. Statistics on this page were generated on November 5, 2026. The full methodology explains every step.