Trading AI
What is a double top?
Last updated: 27 August 2026
A double top is two attempts at roughly the same high, separated by a pullback, where the second attempt fails. A double bottom is the same thing upside down. It is one of the oldest patterns in technical analysis and one of the most over identified, because two highs at a similar price is also the plain description of a range.
What the shape is actually saying
Price rises, stops at a level, pulls back, comes up again, and stops at the same level. Read plainly, that is a market that tried twice to get through a price and could not.
The pullback between the two attempts is not decoration. It is the part that makes the second attempt an attempt at all, rather than the same push continuing. Without a visible pullback there is one high, not two.
The pattern is a description of failure at a level. That is all it claims. Everything sold on top of it, the measured target, the reliability percentage, the pattern scanner, is built on this one observation.
The neckline decides everything
The neckline is the low of the pullback between the two highs. On a double bottom it is the high between the two lows.
Before price breaks the neckline, there is no double top. There are two highs and a pullback, which is what every range in history looks like. The pattern is only confirmed when price closes beyond that line, because that is the moment the market has failed at the highs and then broken the level that had been holding it up.
This is where most of the losses in this pattern come from. Selling the second touch of the high, before the neckline goes, is trading a prediction that the second attempt will fail. Sometimes it does. In a strong uptrend, the third attempt is the one that goes through, and there was never a pattern.
Stated in structural terms, the neckline break is a break of structure. The guide on market structure describes the same event without the pattern vocabulary, and it is the more general way to read it.
Telling it apart from a range
Two highs at the same price and two lows at the same price is a range, and a range can produce four or five touches before anything happens. Some things separate the two:
- What came before. A double top after a sustained advance is a reversal candidate. Two highs in the middle of sideways chop are just the top of the chop.
- The depth of the pullback. A shallow dip between the highs is closer to consolidation than to a failed attempt.
- The second high itself. A second attempt that stalls below the first, or that overshoots slightly and closes back below, says more than one that matches to the tick.
The highs do not need to be equal. Traders looking for a perfect match reject valid patterns and force invalid ones, when the useful question is whether the market failed twice at the same area.
The measured move, and what it is worth
The classical target is the height of the pattern, measured from the highs to the neckline, projected down from the neckline break.
It is a reasonable first estimate and nothing more. It comes from geometry, not from anything the market has agreed to. The retest is worth more attention than the target: after the neckline breaks, price often comes back to it, and a line that was support and now holds as resistance is the pattern confirming itself. A close back beyond it means the break failed. On a double bottom the same test happens upside down. A target that lands in open space is weaker than the same target landing on a level price has already respected, and if there is a prior support level before the measured target, that level is the one that will matter.
The mistakes that cost the most
Trading it before the neckline. Until that line breaks, the pattern does not exist. This is the single most expensive habit attached to it.
Finding it on every timeframe. Drop far enough down and every chart contains double tops constantly. They mean nothing at a scale where two highs are two minutes apart.
Ignoring the trend. A double top against a strong uptrend is a bet that the trend ends here. It can be right. It is a lower probability bet than the same pattern at the end of an extended move.
Forcing symmetry. Real charts are lopsided. Waiting for a textbook shape means missing the real ones.
Questions people ask
How reliable is a double top?
There is no honest percentage, because the answer depends entirely on how strictly the pattern is defined and on what came before it. What is measurable is that an unconfirmed double top, traded before the neckline breaks, is a different and worse bet than a confirmed one.
Do the two tops have to be exactly equal?
No, and requiring it does more harm than good. What matters is that both attempts failed in the same area. A second high slightly above the first that closes back below is often the stronger version.
What is the difference between a double top and a range?
The context and the outcome. A range is two highs and two lows with no resolution. A double top is two failed highs followed by a break of the low between them, in a market that had been rising into it.
Where does the double top target come from?
From the height of the pattern projected down from the neckline. It is geometry applied to the chart, not a level the market has recognised, so an existing level in the way carries more weight.
Reading the failure without naming the pattern
Trading AI reads a photo or a screenshot of any chart and returns the patterns it can see, the market structure around them, the key levels and a full trade plan with its risk. The analysis works from the image, so a pattern is read from the shape that is actually on screen.
The same event described structurally, without pattern vocabulary: What is market structure?
Why the level that both attempts failed at was already worth watching: What are support and resistance?
What the individual candles at each high were recording: How to read a candlestick chart
The same failure at a level with three attempts instead of two: What is a head and shoulders?
This page is educational. It is not financial advice, and nothing here is a recommendation to buy or sell anything.