Candlesticks are the most widely used price chart element in technical analysis, each displaying four data points — open, high, low, and close (OHLC) — for a defined time period. Developed by Japanese rice trader Munehisa Homma in the 1700s and introduced to Western traders by Steve Nison in 1991, candlestick charting is now the default visualization on every major platform from TradingView to ThinkOrSwim. The body color tells you who won the session; the wick lengths tell you how hard the losing side fought.
Key Takeaways
- A large body with small wicks signals strong directional conviction; a small body with long wicks signals indecision or rejection — context determines which side is gaining control.
- The five highest-probability single-candle patterns — hammer, inverted hammer, shooting star, hanging man, and doji — each have precise identification rules; without meeting those criteria exactly, the pattern does not qualify.
- Volume confirmation is non-negotiable: candlestick reversal signals without above-average volume are low-conviction and fail at a significantly higher rate.
How Candlesticks Work
Every candlestick has two parts: the body (the filled rectangle between open and close) and the wicks or shadows (the thin lines extending above and below the body to the session high and low).
- Open: The first traded price of the period
- High: The highest price reached — top of the upper wick
- Low: The lowest price reached — bottom of the lower wick
- Close: The final traded price — determines body color
A green (bullish) body forms when close is above open. A red (bearish) body forms when close is below open. The body width on the price axis equals the open-to-close range.
Body and wick ratios carry the real information. A body that spans 80% of the total candle range — open near the low, close near the high — indicates a session where buyers dominated completely with no meaningful pushback. A candle where the body is 20% of total range, with a lower wick three times the body length, shows sellers drove price down hard but buyers reclaimed nearly all of it. That battle matters.
The Five Most Reliable Single-Candle Patterns
| Pattern | Trend Context | Identification Criteria | Signal |
|---|---|---|---|
| Hammer | Downtrend | Small body at top; lower wick at least 2x body; upper wick minimal | Bullish reversal |
| Hanging Man | Uptrend | Same shape as hammer | Bearish reversal |
| Inverted Hammer | Downtrend | Small body at bottom; upper wick at least 2x body; lower wick minimal | Bullish reversal |
| Shooting Star | Uptrend | Same shape as inverted hammer | Bearish reversal |
| Doji | Either | Open and close within ~0.1% of each other | Indecision / potential reversal |
Notice that the hammer and hanging man are visually identical — trend context is what separates a bullish from a bearish signal. The same pattern at support after a downtrend is a buy signal; the same pattern at resistance after a rally is a warning to exit longs.
Practical Example
SPY is pulling back on the daily chart toward the $510 support zone — a level that served as resistance six weeks earlier and is now being tested as support. On Tuesday, SPY opens at $511.20, drops to a session low of $507.50, then recovers strongly to close at $513.80.
Anatomy of this candle:
- Real body: $513.80 − $511.20 = $2.60
- Lower wick: $511.20 − $507.50 = $3.70 (1.4x the body)
- Upper wick: near zero
The lower wick is close to — though just under — the 2x threshold for a textbook hammer. However, volume is 95 million shares versus the 20-day average of 68 million (40% above average), which strengthens the signal considerably. A swing trader entering on Wednesday’s open at $514.00 would place a stop just below the hammer low at $507.00 and target the prior resistance at $522.
- Risk: $7.00/share
- Reward: $8.00/share
- R:R ratio: 1.14:1
- Position size at 1% risk on a $50,000 account ($500 max loss): 71 shares
A candlestick shows four prices for a time period: open, high, low, and close. The colored body shows whether price rose or fell, and the thin lines called wicks show how far price moved before reversing. Patterns like the hammer signal potential reversals when confirmed by volume.
Common Mistakes
- Skipping trend context. A hammer in the middle of a range with no clear trend is not a signal — it is noise. Every candlestick pattern requires a defined directional context to have meaning.
- Ignoring volume. Thomas Bulkowski’s research on 103 candlestick patterns found patterns confirmed by above-average volume (such as the evening star at ~72% bearish accuracy in bull markets) significantly outperformed unconfirmed versions. Treat low-volume reversal candles as preliminary observations, not actionable signals.
- Over-counting wick length. A lower wick of 1.8x the body is not a hammer. Precise identification criteria exist for a reason — rounding up produces false signals and degrades edge over hundreds of trades.
- Trading lower-timeframe patterns against higher-timeframe trends. A bearish doji on a 5-minute chart during a strong daily uptrend is statistically far more likely to resolve bullish. Always check the daily chart before acting on intraday candlestick patterns.
How JournalPlus Tracks Candlestick Patterns
JournalPlus lets traders tag each trade with the setup type — including specific candlestick patterns like hammer, engulfing, or breakout — so performance data by pattern type accumulates automatically over time. After 50 or more tagged trades, the analytics dashboard shows win rate, average R, and expectancy broken down by setup, giving traders objective data on which candlestick signals actually produce edge in their specific market and timeframe.
