A double top is a chart shape with two peaks at about the same price, separated by a dip. A double bottom is the mirror image: two troughs at about the same price, separated by a rally. Traders read both as signs that a trend may be losing strength, but the shape on its own proves little. The pattern only means something after the price breaks through the level between the two turning points.
This guide explains how to identify each pattern, where the neckline and the target are usually drawn, and why many apparent double tops never lead to a fall. It uses an invented price series to show the steps. Like every chart pattern, the double top and double bottom are subjective. Two traders can draw them differently on the same chart, so the rules below are conventions rather than guarantees.
What does a double top look like?
A double top forms after an uptrend. The price rises to a high, falls back to a support level, climbs again to roughly the same high and fails to go higher. The textbook reading is bearish: a break below the support level, called the neckline, suggests the uptrend is over. A weaker second peak makes the shape more convincing.
The two peaks should sit close together in price. Many traders accept a small gap, but a second peak well above or below the first is a different shape. The time between the peaks matters too. Peaks that are very close together may be ordinary swings, and peaks that are far apart may belong to a larger range. Some traders also compare volume at the two peaks. A second peak on lower volume suggests fewer buyers are willing to push the price higher, which supports the bearish reading. None of these checks is decisive alone. Together they help you decide whether the shape is clean enough to watch.
What does a double bottom look like?
A double bottom forms after a downtrend. The price falls to a low, rallies to resistance, returns to about the same low and fails to fall further. The textbook reading is bullish: a break above the resistance level, the neckline, suggests the downtrend may be ending. A second low held by stronger buying makes the shape more credible.
The mirror-image checks apply. The two lows should be close in price, the rally between them should be clear, and the second low should show less selling pressure if your volume data is available. A double bottom inside a long, sideways range is harder to read than one that follows a clear fall. Look at the wider chart before you act, because a double bottom in the middle of a steep decline is a different situation from one that appears after the price has already recovered. Mark the two lows with a horizontal line so the comparison is visible.
How do you place the neckline and the target?
The neckline is the lowest point between the two peaks for a double top, or the highest point between the two troughs for a double bottom. A common textbook target is the distance from the turning points to the neckline, projected from the breakout. Treat that target as a rough reference rather than a forecast.
Some traders draw the neckline through a line of closing prices instead of the intraday extremes, which moves the level by a small amount. Once the neckline breaks, the textbook target is the same height as the pattern, measured down from the neckline for a double top or up for a double bottom. The table below uses invented prices to show the method.
| Step | Level | What it means |
|---|---|---|
| First peak | 120 | The first turning point |
| Trough between the peaks (neckline) | 100 | The level to watch |
| Second peak | 119 | Close to the first, so the shape is clean |
| Close below the neckline | 98 | The break that confirms the pattern |
| Pattern height (120 − 100) | 20 | The distance used for the target |
| Textbook target (100 − 20) | 80 | A rough reference, not a promise |
The example is illustrative. The target lies 18 points below the close that confirmed the pattern. Before you act, check where the nearest support sits, because a level just below the neckline can slow or stop a move. A target that falls through several old support zones is less likely to be reached in a straight line.
Why do so many double tops fail?
Many double tops do not lead to the expected fall. The price may revisit the neckline, close back above it, or drift sideways for weeks. A close back above the neckline weakens the bearish reading, and the pattern can turn into a range or a resumed uptrend.
Chart patterns are easy to find in hindsight and harder to trade in real time. Two peaks that look alike can be ordinary price swings, and a neckline can be set by a single bar. Studies of chart patterns report mixed results, and this guide does not cite a specific study as proof that double tops work. For a more careful look at the evidence, read the backtest guide linked below. The practical lesson is to treat the pattern as a reason to watch a level, and to wait for the break and the follow-through before you treat it as a signal.
How do you confirm the pattern?
Many traders wait for a close beyond the neckline rather than an intraday touch, then look for a retest of the broken level from the other side and for volume that supports the move. A pattern that breaks cleanly and holds the retest is more reliable than one that breaks briefly and returns.
- A close beyond the neckline, not a spike that returns within the same session.
- Volume that rises on the break, if your data shows it.
- A retest of the neckline that holds on the other side.
- A stop placed beyond the second peak or trough, so the idea is clearly wrong if the pattern fails.
Keep the size of any position small relative to your account. A small position means that one failed pattern does not do much damage, which matters because many patterns fail.
Common mistakes
Calling any two highs a double top. The peaks need to be close in price, with a clear dip between them. Two highs that differ by a wide margin are a different shape.
Acting before the neckline breaks. The pattern is incomplete until the break. Entering early means you are betting on the shape alone.
Ignoring the wider trend. A double top inside a strong uptrend can simply be a pause. Read the pattern against the larger chart.
Checklist
- Mark the two peaks or troughs and check that they sit close in price.
- Draw the neckline through the lowest point between the peaks or the highest point between the troughs.
- Note the volume at each turning point, if your data shows it.
- Wait for a close beyond the neckline before you treat the pattern as confirmed.
- Look for a retest of the broken level and check whether it holds.
- Set your invalidation level beyond the second turning point before you act.
- Record the pattern, the date and the outcome, so you can judge your own record later.
Key takeaways
A double top has two similar peaks and a neckline below them, and it is read as bearish after a clean break. A double bottom is the mirror image and is read as bullish after a break above the neckline. The shape is subjective and many do not follow through, so the break and the retest matter more than the two turning points alone.
This guide is for general information, not financial advice. See the disclaimer.