Candlestick patternsHammer
A small body with a long lower wick after a decline — buyers slamming a bottom back up.
Works best in trending marketsEngine-computed on a fixed sample series
What it is
A hammer is a single candlestick that signals buyers have slammed a falling market back up off its lows. It has a small real body sitting near the top of the bar's range and a long lower shadow that extends well below, with little or no upper wick, so it looks like a hammer with a short head and a long handle. The message is that during the session sellers pushed price sharply down, but buyers stepped in with force and drove it back up to close near where it opened, or higher. It answers whether a downtrend is losing its grip, and appearing after a decline it is read as a bullish reversal signal that selling pressure may be exhausted. The long lower shadow is the essence of the pattern — a visible, rejected sell-off that hints the market has found a floor, at least temporarily.
How it is formed
A hammer forms when the real body is small and located in the upper portion of the range, and the lower shadow is at least about twice the length of the body, with a negligible or absent upper shadow. The colour of the body matters less than its shape and location — a green (up-close) body is marginally stronger than a red one, but both qualify so long as the long lower wick and small body are present near the top of the range. What defines it is the geometry: price fell far below the open during the session and was then bought all the way back, leaving that long tail beneath a compact body. Critically, the pattern only earns its bullish meaning after a downtrend; the identical shape appearing after an uptrend is a hanging man with the opposite implication. So the hammer is a one-bar shape whose interpretation is inseparable from the decline that must precede it.
Reading it, step by step
First confirm the setup: a hammer counts only after a clear downtrend, where it marks a potential bottom. The long lower wick is the story — read it as an intraday sell-off that was completely rejected, evidence that buyers overwhelmed sellers at lower prices and that selling pressure may be spent. The small body near the top shows price recovered nearly all of its losses by the close, and the shorter the upper wick, the cleaner the recovery. Body colour is a secondary refinement, with an up-close hammer slightly more convincing than a down-close one, but location within the trend outweighs colour entirely — a hammer in the middle of a range is meaningless. Because a single candle is only a hint, the reliable read comes with confirmation: an up-candle that closes above the hammer's body validates the reversal, while a break below the hammer's low negates it and warns the floor has given way.
Best timeframes and settings
The hammer has no parameters, but the timeframe governs its significance — a hammer on a daily or weekly chart after a sustained decline is a far weightier signal than one on a 1-minute chart, where the shape appears constantly and mostly reflects noise. It suits swing and position traders looking for reversals at the end of a pullback or a downtrend on higher timeframes. The practical judgment is how strict to be about the definition: how small the body must be, how long the lower shadow relative to the body (two times is the common minimum, but three or more is stronger), and how short the upper wick. A stricter definition yields fewer but higher-quality hammers, while a loose one floods you with marginal shapes. The reliability of the pattern rises with the timeframe and with confluence at a support level, so higher timeframes and clear structure are where it earns its reputation.
When and where to use it
Use the hammer as a bullish reversal cue at the end of a downtrend or at the bottom of a pullback within a larger uptrend, on liquid instruments and on timeframes where each candle carries real participation. It is most powerful when it forms at a known support level, a prior swing low, a Fibonacci retracement, or the lower edge of a channel, where the rejection has structural meaning. It works across asset classes — stocks, FX, commodities, crypto — wherever candlestick charts are used. Avoid trading it in the middle of a range where there is no trend to reverse, and avoid acting on it into major overhead resistance, where even a strong hammer can roll over. Most importantly, avoid taking it without confirmation, since an unconfirmed hammer fails frequently; treat it as one piece of evidence that a bottom is forming, corroborated by location and follow-through.
Strategies that use it
Confirmation-entry strategy: after a downtrend, wait for a confirming up-candle that closes above the hammer's body, then enter long with a stop placed just below the hammer's low, sizing the position against that wick-defined stop rather than guessing. Support-bounce strategy: prioritise hammers that print exactly at a tested support level or prior swing low, entering on confirmation because the pattern and the level reinforce one another, and targeting the nearest resistance. Pullback-in-uptrend strategy: within an established uptrend, use a hammer at a retracement level as a signal to rejoin the trend, buying the confirmation with a stop below the hammer and riding the resumption. In each case the low of the hammer is the natural invalidation point — a decisive close below it means the reversal has failed and the trade should be cut — which keeps risk tightly and objectively defined.
Combining it with other indicators
The hammer becomes far more reliable when it aligns with other bullish evidence. A hammer forming at a horizontal support level, a Fibonacci retracement, or the lower Bollinger Band gives the rejection structural weight. A bullish divergence on RSI or the MACD — price making a lower low while the oscillator makes a higher low — coinciding with the hammer strengthens the reversal case. Oversold readings on RSI or a stochastic at the time of the hammer reinforce that the decline was stretched and ripe for a bounce. Volume adds confirmation, since a hammer on notably high volume suggests genuine buying absorbed the sell-off. Pairing the candle with a higher-timeframe uptrend keeps you buying reversals in the direction of the larger structure, which filters out the many hammers that print against a dominant downtrend and fail.
Where it fails
The classic mistake is ignoring location — body colour matters far less than where the hammer sits, and a hammer mid-range or without a preceding downtrend is meaningless. Without confirmation the pattern fails often, because one session's rejection can be overrun by renewed selling the next day. A hammer that forms into major overhead resistance can still roll over even when it looks textbook, since the structural barrier outweighs the single-bar signal. On low timeframes hammers are so common they are mostly noise. The defences are to require a genuine prior decline, wait for a confirming up-candle before entering, favour hammers at support with oversold or divergent momentum, and use the hammer's low as a strict stop so a failed signal is cut quickly and cheaply. Treating the hammer as a probabilistic hint within a broader read, rather than a guarantee, is what keeps it useful.
A worked example
Suppose a stock has been sliding for a week and reaches a support level near 95. One session it opens at 99.5, sells off hard to a low of 95.0 as sellers press, then buyers step in and lift it back to close at 100.0 — a small green body between 99.5 and 100.0, a long lower shadow of about 4.5 points down to 95.0, and almost no upper wick. That lower shadow is roughly nine times the tiny body, a textbook hammer, and it has formed right at support after a clear decline. The next day price opens firm and closes up at 101.5, above the hammer's body, confirming the reversal. A trader enters long on that confirmation, places a stop just below the 95.0 low to define risk, and targets the prior resistance near 104. The hammer's low gives a clean invalidation: a decisive close back below 95 would say the floor had failed and the trade was wrong, so the position is cut there rather than hoped through.