What Candlestick Bodies and Wicks Can—and Cannot—Tell You
Learn to calculate candlestick bodies and wicks from open, high, low, and close prices, why a bullish candle can still mean a daily loss, and why a candle cannot reveal the sequence of price moves.
A candlestick's body spans the open and close, while its wicks extend beyond the body to the high and low. Each candle compresses four prices into one record, so it does not reveal the sequence of moves or participants' intentions. Checking the actual prices before relying on color helps avoid confusion caused by chart settings.
The change from the previous close differs from the direction of the body
On a standard candlestick chart, a candle is bullish when the close is above the open and bearish when it is below. This uses a different reference point from the percentage change between yesterday's close and today's close. If a stock opens sharply lower than the previous day and then partially recovers, a bullish candle can still leave a loss relative to the previous close. Default colors can differ across Korean and overseas services, and some settings let users color candles relative to the previous close. Rather than describing a price as having risen simply because a candle is red, check the relationship between the open and close. A candle with almost no body does not mean there was no trading.
Wicks record retracements, not the order of events
A long upper wick tells you that the period ended below its high. A daily candle alone cannot tell you whether that high occurred just after the open or just before the close. Similarly, a lower wick indicates a distance between the low and the close; identifying who bought at the low requires separate data. When comparing body and wick lengths, using the full high-minus-low range as the denominator makes your record clearer. Ratios cannot be calculated for a candle with a range of zero.
Context can change the meaning of the same shape
A long wick on the day after an earnings release and a long wick in a stock that rarely trades cannot readily be attributed to the same cause. Noting the candle's size relative to neighboring candles, trading volume, and any premarket disclosures makes your interpretation easier to evaluate. Returns depend on actual purchase and sale prices, so candle color alone cannot explain investors' profits or losses that day. Also check whether the candles transform prices, as Heikin Ashi candles do, or are standard candles showing actual OHLC prices. The candles being compared must also use the same timeframe.
Worked example
Hypothetical example: Suppose the previous close was 10,500 won, and today's open, high, low, and close are 10,000 won, 10,400 won, 9,700 won, and 10,200 won. The body is 200 won, the upper wick is 200 won, and the lower wick is 300 won. The full range is 700 won, equal to the sum of those three lengths. Although the candle is bullish, the return relative to the previous close is 10,200÷10,500−1, or approximately −2.86%. Even with the same four prices, several intraday price paths are possible.
What to check
- Check whether candle colors are based on the open or the previous close.
- Check that the body plus both wicks equals the high minus the low.
- Do not infer the order of the intraday high and low from a daily candle alone.
Sources and primary materials
This is educational material about research methods. For an actual company decision, verify the filings and primary sources for the relevant period.