What it means
A candlestick chart shows four prices for each period: the open, the high, the low and the close. The thick part, called the body, spans the open and the close, and the thin lines above and below, called shadows, reach to the high and the low.
A hammer has a short body near the top of the range and a long lower shadow, with little or no upper shadow. The story the candle tells is one of rejection.
During the period, sellers drove the price well below the open, but buyers stepped in and pushed it back to close near the opening level. This suggests that selling pressure may be fading.
Technical analysts look for the pattern after a downtrend, where it may signal a bottom. The usual rule of thumb is that the lower shadow should be at least twice the length of the body, and the upper shadow should be very small.
The colour of the body matters less than its position and size. Most traders wait for confirmation before acting.
A hammer is followed by a higher close on the next period, or by strong volume, before they treat it as a buy signal. Many also place a stop-loss below the low of the hammer, so that the loss is limited if the reversal fails.
A hammer is not a guarantee. It works best alongside other evidence such as support levels and volume, and it can fail in strongly falling markets.
The same shape appearing after a rise has a different name, the hanging man, and a different meaning. Time frame also matters.
A hammer on a weekly chart reflects a whole week of trading and is usually taken more seriously than one on a five-minute chart. Traders should state the time frame whenever they describe a pattern, so that others know how much weight to give it.
In practice
Real-world examples.
Example
A trader notices that a share has fallen for six sessions in a row. On the seventh day, a hammer forms with a long lower shadow, and the next day the price closes higher. She buys with a stop-loss just below the hammer's low. She sizes the position so that a loss would cost no more than 1% of her account.
Example
A portfolio manager reviews the weekly chart of a commodity fund and sees a hammer forming at a well-known support level. He does not trade on it alone. He checks volume and news before deciding to add to the position. The team records the reasoning in the trade log for later review.
Example
A finance student studies candlesticks and finds hammers on a historical chart of an index. She tests how often the price rose over the following week. She concludes that the pattern helped a little, but not reliably enough to use alone. Her professor suggests testing it across different markets and time periods.
Formula
Calculation
Hammer test: lower shadow >= 2 x body, and upper shadow is very small
Suppose a share opens at $50.00, rises to a high of $50.40, falls to a low of $48.80 and closes at $50.30.
Body = 50.30 - 50.00 = $0.30. Lower shadow = 50.00 - 48.80 = $1.20. Upper shadow = 50.40 - 50.30 = $0.10.
The lower shadow is 1.20 / 0.30 = 4 times the body, which is above the minimum of 2, and the upper shadow is small, so the candle qualifies as a hammer.Case study
Seen in the real world.
Bluefin Capital is an illustrative, fictional fund whose analysts tested hammer patterns on a basket of liquid shares. They counted each hammer that appeared after at least five falling sessions.
In the fictional results, the price rose over the next five sessions in a little more than half of the cases, only slightly better than chance. When the hammer was confirmed by a higher close and above-average volume, the success rate improved.
The firm decided to use hammers only as an alert that prompted further research, never as a standalone signal. The head of risk added a rule that every trade must have a stop-loss placed before entry. The analysts also agreed to record every hammer they saw, including the ones that failed, so that future tests would not be biased toward successes.
Watch out
Common mistakes.
- Trading on the first hammer without waiting for a confirming candle.
- Using the pattern in the middle of a range, when it has no downtrend to reverse.
- Confusing a hammer with a hanging man, which has the same shape but appears after a rise and warns of a fall.
Questions
People also ask.
What does a hammer candlestick look like?
It has a small body near the top of the range and a lower shadow at least twice as long as the body.
Does the colour of the hammer matter?
It matters less than the shape and position, although a closing price above the open is generally viewed more positively.
Is a hammer a reliable buy signal?
Not by itself, since it works best with confirmation and other evidence.
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