A double top is two peaks at roughly the same price with a trough between them, formed at the end of an uptrend; a double bottom is the same shape inverted. Neither is confirmed by the second peak. Both are confirmed only when price closes through the trough or peak between them — the level the formation was built on.
Most of what goes wrong with this pattern comes from one omission: the two touches have to be genuinely separated in time. Get that right and the rest follows.
What actually defines a double top
The vague version — "two peaks at about the same level" — is what makes the pattern feel ubiquitous, because on any chart, at any zoom, price touches similar prices constantly. The useful version has numbers in it.
When Andrew Lo, Harry Mamaysky and Jiang Wang built an algorithm to detect chart patterns without human judgement for their Journal of Finance paper Foundations of Technical Analysis, they had to write the definition down precisely. Following the classic Edwards and Magee text, they required two conditions:
- The two tops must be within 1.5% of their average price.
- The two tops must occur at least a month — 22 trading days — apart.
The first condition is the one everybody applies. The second is the one almost nobody does, and it is the one that carries the meaning.
How often they show up
In the same study, applied to US stocks from 1962 to 1996, double tops and double bottoms were the most frequently detected of the ten classical patterns tested, with over 2,000 occurrences of each — ahead of head and shoulders, which came second with more than 1,600 of each.
That is a fact worth sitting with. The most common pattern on your chart is also, by construction, the one you are most likely to mark badly. Frequency is not evidence of reliability; it is mostly evidence that the definition is loose.
The paper's own conclusion is worth quoting accurately, because it is routinely overstated in both directions. The authors found that several technical patterns "do provide incremental information," particularly for Nasdaq stocks, while explicitly noting this "does not necessarily imply that technical analysis can be used to generate 'excess' trading profits." Information, yes. A licence to print money, no.
The mechanism, in plain terms
Strip away the name and a double top is a level that held twice. That is all. The first rejection tells you sellers were present at that price. The second rejection tells you they were still present after the market had time to reconsider — and that the buyers who pushed price back up could not get through.
This is exactly the logic of support and resistance, and it is why the double top is worth more as a level-reading exercise than as a shape-spotting one. A double bottom is the same argument in reverse: a price the market refused to trade below, twice, with time in between.
It also explains the failure case honestly. A level that has held twice is more interesting, not less, to anyone hunting resting orders above it — the dynamic covered in liquidity grabs and stop hunts. A twice-tested high is an obvious place for stops to sit, and obvious places attract traffic. The related question of what to do when a level has already failed twice is handled in trading a level that has failed twice.
Double top vs double bottom vs a range
| Double top | Double bottom | Range | |
|---|---|---|---|
| Prior trend | Up | Down | None required |
| Two touches of | A high | A low | Both edges, repeatedly |
| Confirmed by | Close below the middle trough | Close above the middle peak | Nothing — it is a state, not a signal |
| Stop belongs | Above the higher peak | Below the lower trough | Outside the range boundary |
The third column matters. Four or five touches of the same high is not a stronger double top — it is a range, and ranges are traded differently, as set out in the range day playbook. Two touches is the pattern. More than two is a different market condition.
Where the stop goes, and why not between the peaks
Just beyond the higher of the two peaks for a double top; just beyond the lower of the two troughs for a double bottom.
The temptation is to tuck the stop somewhere inside the formation to keep the risk small. It is a false economy. If price trades above the highest point of a double top, the level that defined the pattern has been taken and the entire premise is void — that is your genuine invalidation, in the sense described in what invalidation means in trading. Anything closer is a stop placed where nothing meaningful has happened, and it will be hit by noise before the idea has been disproved.
The consequence is the same one as on every pattern with a wide structure: the stop distance decides the position size, not your preference. Run the numbers with the position size calculator before deciding whether the trade is worth taking at all.
The measured move
The conventional target is the height of the formation — from the peaks down to the middle trough — projected below the break point. As with every measured move, it is geometry, not prediction. Nothing ties the depth of a past pullback to the length of a future one.
Its honest use is as a feasibility check. If the projection does not clear the next real level on your chart by enough to justify the stop distance, the trade fails the risk-reward test before it begins, and no amount of pattern quality fixes that.
A short checklist before you call one
- Is there a clear prior trend into the first peak? No trend, no reversal.
- Are the two peaks within about 1.5% of each other?
- Are they genuinely separated in time — weeks on a daily chart, not three bars?
- Has price closed through the middle trough, not just wicked through it?
- Is the stop above the higher peak, and is the position sized from that distance?
If any answer is no, you have a chart with two highs on it, which is not the same thing. The broader toolkit sits in technical analysis basics, and the reversal pattern most often confused with this one is covered in the head and shoulders pattern.
Frequently Asked Questions
What is a double top?
A double top is two peaks at roughly the same price with a trough between them, formed at the end of an uptrend. It is read as a reversal signal, and it is confirmed only when price closes below the trough between the two peaks. A double bottom is the same formation inverted at the end of a downtrend.
How far apart do the two peaks need to be?
Further apart than most traders assume. In the automated study by Lo, Mamaysky and Wang, following Edwards and Magee, the two peaks had to be within 1.5 percent of their average price and separated by at least a month, or 22 trading days. Two peaks a few bars apart are not a double top; they are ordinary consolidation.
What is the difference between a double top and a double bottom?
Only direction. A double top forms at the end of an uptrend as two highs at a similar price and is confirmed by a close below the trough between them. A double bottom forms at the end of a downtrend as two lows at a similar price and is confirmed by a close above the peak between them. The rules for spacing, confirmation and stop placement are identical.
Where do you put the stop on a double top?
Just beyond the higher of the two peaks, not between them. If price trades above the highest point of the formation, the level that defined the pattern has been taken and the reason for the trade is gone. A stop tucked inside the range between the peaks will be triggered by ordinary noise before the idea has been disproved.
Bottom line
A double top is the most commonly detected chart pattern in the academic record and one of the most commonly mis-marked in practice, for a single reason: traders apply the price condition and ignore the time condition. Two highs within 1.5% of each other, weeks apart, after a real trend, confirmed by a close through the trough, with the stop above the higher peak — that is a pattern. Two highs three bars apart is a chart. The difference is not cosmetic; it is the whole edge.