Candlestick Patterns Explained

At a glance

What they show: Where price was rejected within a bar
Most useful ones: Engulfing, pin bar, inside bar, doji
Critical requirement: Location. The same candle means different things in different places
Evidence: Small effects, highly dependent on definition and context

Key takeaways

A candle body shows the net result of the period; the wicks show the prices that were tested and rejected.
Location matters more than shape: a hammer at the low of a pullback in an uptrend is meaningful, the same candle mid-range is noise.
Studies of candlestick patterns generally find small effects that are highly sensitive to the exact definition used.
The most practically useful patterns are the ones that identify rejection or absorption at a known level.
Candlestick patterns work best as entry triggers within a framework established by trend and structure, never as standalone signals.

What a candle tells you

Each candle encodes four prices. The body spans open to close and shows the net outcome. The wicks span to the high and low and show prices that were reached and then rejected. A long upper wick means buyers pushed price up and sellers pushed it back, which is information about where supply appeared.

Long body, small wicks: one side dominated throughout the period.
Small body, long wicks both sides: a contested period with no resolution.
Long lower wick, close near high: sellers pushed down and were absorbed; buyers finished in control.
Long upper wick, close near low: the mirror image; buyers were rejected.
No body (doji): the period ended where it began, indicating balance or indecision.
Gap between candles: repricing occurred while the market was closed or illiquid.

The patterns worth knowing, defined objectively

Bullish engulfing: The current candle closes above the prior candle high and opens below the prior close, so the body fully covers the prior body. Indicates a decisive shift within one period. See engulfing and pin bars.
Pin bar / hammer: A candle whose lower wick is at least twice the body length, with the close in the upper third of the range. Indicates rejection of lower prices.
Shooting star: The inverse: upper wick at least twice the body, close in the lower third. Indicates rejection of higher prices.
Inside bar: The entire range falls within the prior bar range. Indicates contraction and a pause in the prior direction.
Outside bar: The range fully contains the prior bar. Indicates expansion and often a change in control.
Doji: Open and close within a small fraction of the range. Indicates balance, and requires context to interpret.
Morning / evening star: A three-bar structure: a strong bar, a small-bodied bar, then a strong bar in the opposite direction. Indicates a pause followed by reversal.

Notice that each definition is numeric. "Roughly twice the body" and "the upper third" can be coded and tested. Descriptions such as "a small body near the top" cannot, which is why so much candlestick material resists evaluation.

Location is more important than shape

Location	Interpretation	Actionable?
At the low of a pullback in an uptrend	Buyers defended a retracement	Yes, as a trigger within a trend setup
At a well-tested support level	Demand reappeared where it appeared before	Yes, with a stop below the level
In the middle of a range with no level nearby	Noise	No
In a sustained downtrend with no structure	A single day of buying in a persistent decline	No; counter-trend with no support
After a climactic high-volume selloff at a level	Possible absorption of forced selling	Yes, with confirmation

The same hammer candle, in four contexts.

What the evidence shows

Academic studies of candlestick patterns have produced mixed results, and the disagreements usually trace back to definitional choices. Studies that impose strict numeric definitions generally find small effects, often concentrated in specific markets or periods, and frequently insufficient to overcome transaction costs on their own.

Effects are small. Where a statistically detectable edge exists, it is typically measured in fractions of a percent over subsequent days.
Definitions dominate. Changing the wick-to-body ratio from 2 to 2.5 can change a positive result into a negative one, which is a warning sign.
Context improves results markedly. Patterns filtered by trend, by level, or by volume perform considerably better than unfiltered ones.
Markets differ. Patterns that appear in equity data often do not replicate in futures or currencies, which suggests market-specific microstructure rather than universal behaviour.
Modern markets differ from historical ones. Candlestick analysis developed in a different era of market structure, and electronic markets produce different intrabar dynamics.

Practical use

1
Establish the trend first
Use a moving average or structure definition. Only look for bullish candles in uptrends and bearish candles in downtrends, unless you are explicitly trading reversals with a defined framework.
2
Identify the level of interest before the candle appears
Support, a pullback zone, a prior range boundary. The level should exist independently of the candle.
3
Use the candle as the trigger
Enter on a break of the candle extreme rather than at its close, which requires the market to confirm the rejection.
4
Place the stop beyond the candle
Below the pin bar low or engulfing candle low, plus a volatility buffer. The candle defines the invalidation level, which is its most valuable contribution.
5
Size from that stop distance
Longer candles mean wider stops and smaller positions. This automatically penalises entries after violent bars.
6
Record the base rate
Log every instance, including the ones you skipped, and measure what actually followed. Without this you will remember only the ones that worked.

Frequently asked questions

Which candlestick pattern is the most reliable?

Engulfing bars and pin bars at pre-identified levels have the clearest mechanism and the most straightforward definitions, which makes them the most usable. Reliability figures quoted without a numeric definition and a stated sample should be treated as marketing rather than evidence.

Do candlestick patterns work on all timeframes?

The construction applies anywhere, but shorter timeframes contain far more noise, so patterns appear constantly with little meaning. Daily and weekly candles represent the aggregate decisions of many participants over a meaningful period, which is why patterns there carry more information than on a 5-minute chart.

Should I trade a pattern as soon as the candle closes?

Requiring confirmation, usually a break of the candle’s extreme on the following bar, reduces false signals substantially at the cost of a worse entry price. Which is better depends on the market and should be tested, but for most traders confirmation is the safer default.

What does a doji mean?

That the period opened and closed at nearly the same price, indicating balance between buyers and sellers. On its own it means very little, because balance occurs constantly. It becomes meaningful only at a significant level or after an extended move, where it may indicate that the prevailing pressure has stopped.

Are candlestick patterns useful for algorithmic trading?

Only once defined numerically, at which point they become ordinary conditions like any other. Many systematic strategies use simplified versions, such as requiring the close in the upper third of the range, as a filter rather than as a primary signal. The named pattern adds nothing beyond its numeric definition.

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Educational use only. This guide explains how a strategy works. It is not investment advice, not a recommendation, and no result described here is a forecast. Test any approach on historical and out-of-sample data, size positions conservatively, and never risk money you cannot afford to lose.