Candlestick chart

A candlestick chart is a style of price chart that shows four pieces of price data for each time period—the open, high, low, and close—stacked into a single visual unit called a candle. The rectangular body shows the distance between open and close; thin vertical lines (wicks) extending above and below show the period’s high and low. This format, developed in Japan in the 18th century, has become the dominant way to visualize price action in modern trading.

Anatomy of a single candle

Every candlestick encodes four prices in a single vertical bar. The body (rectangular part) spans from the session’s open price to its close price. If the close is above the open, the candle is typically drawn in green (or white) and called bullish; if the close is below the open, it is red (or black) and called bearish. The thin vertical lines extending above and below the body are the wicks (or shadows): the upper wick reaches the session’s high price, and the lower wick reaches the session’s low.

This four-value encoding means a candlestick chart packs twice as much information into a single bar as a traditional line chart, which shows only the closing price. That density is why candlesticks became standard for serious technical analysts.

Why four prices matter

A trader looking at a chart cares not just about where a price ended but where it travelled. A stock that opened at $100, climbed to $105, fell to $98, and closed at $102 tells a story — one of intraday struggle, recovery, and late-day buying — that a single closing price cannot convey. The open and close reveal the period’s net direction; the high and low reveal the full range of price discovery that occurred.

This is especially crucial for traders working on short time frames. On a daily chart, the wicks might represent only small intraday noise. On a five-minute chart, where traders are hunting for brief momentum shifts, the high and low become critical: they show the exact level where buyers or sellers capitulated and reversed.

The role of time

A candlestick’s time period is arbitrary and set by the trader. The most common periods are:

• Minute bars (1, 5, 15, 30 minutes) — used for intraday scalping and swing trading
• Hourly bars — for day traders and shorter-term swing traders
• Daily bars — the most common timeframe for retail investors and position traders
• Weekly and monthly bars — for longer-term trend analysis
• Custom periods — many platforms allow any duration, useful for specific strategies

The choice of timeframe shapes what the chart reveals. A stock might look like a strong uptrend on the daily chart but be choppy and directionless on the five-minute chart. Professional traders often examine multiple timeframes at once to separate noise from signal: a position is stronger if the daily, weekly, and monthly all align.

Wicks and their meaning

The wicks (shadows) extending above and below the body deserve close attention. A long upper wick suggests that buyers pushed the price high but sellers ultimately won the session, driving the close back down. This indicates rejection of higher prices and is often bearish. Conversely, a long lower wick shows buyers stepping in to defend a lower level, with the close well above the session’s low — often bullish, as it suggests support held.

A candle with virtually no wicks (a marubozu) suggests strong conviction: prices opened and closed near the extremes with little to no rejection. A candle with long wicks in both directions (a spinning top) suggests indecision and weakness.

Candlestick patterns and traders’ psychology

The specific shapes and sequences of candles form recognizable patterns that traders interpret as signs of bullish or bearish reversals, continuations, or indecision. These patterns are based on the idea that price action reveals the balance of supply and demand — when certain configurations recur, traders expect similar outcomes. This belief drives much technical analysis, though it is worth noting that efficacy of candlestick patterns is disputed in academic literature, which finds that patterns occur at random frequencies and have no predictive power beyond what one would expect by chance.

How to read a candlestick chart

Start from the left (oldest data) and move right (newest). The vertical positioning of each candle shows the price range for that period; the colour (green or red) shows the direction of the close. A series of green candles rising from left to right suggests an uptrend; a series of red candles descending suggests a downtrend. Watch for turning points where the pattern shifts or where wicks form at suspected support or resistance levels.

A well-formed candlestick chart requires clean data: accurate open, high, low, and close for each period. For stocks, this data comes from the exchange; for cryptocurrencies and other assets, data quality varies. Any gaps in trading (market holidays, pre-market closures) may appear as jumps in the chart.

Candlesticks versus other chart types

Candlesticks are now the de facto standard for serious technical analysis, but they are not the only option. A line chart is simpler and cleaner but shows only closing prices. An OHLC bar chart also shows all four prices but uses vertical bars instead of the body-and-wick layout. Renko and point-and-figure charts discard time entirely and focus on price moves of fixed magnitude, useful for removing noise. For most modern traders, however, candlesticks remain the lingua franca of technical analysis.

See also