Candle body: the definition
A candlestick is a charting shape that summarizes price movement over a specific time period (for example, a 15-minute bar or a daily bar). The candle body is the filled (or colored) rectangular area between the open price and the close price for that same period.
- If close > open, the body represents a rise over the time window.
- If close < open, the body represents a fall.
- If close = open, the body has no height (it becomes a flat line at that price level).
In plain terms: candle body measures the open-to-close distance, not the full range of prices reached.
How candle body works in forex charts
Candle body is based on three inputs for each time window:
- Open: the first price in that period.
- Close: the last price in that period.
- Direction: whether the close is above or below the open.
A common way to express it is as a range:
- Body size = |close − open|
You can also relate body size to the opening price to get a relative move:
- Relative body size = |close − open| / open
Assumptions matter for calculations like these. For example, you must choose the same time window (candles built from the same duration) and use consistent price definitions (typically the platform’s recorded open and close for that bar). Because outcomes vary with market conditions, costs, execution, and jurisdiction, candle body is best treated as descriptive chart information, not a promise about future results.
Candle body vs adjacent candlestick parts
Candlesticks also include wicks (sometimes called shadows): lines that extend above and/or below the body.
- Wicks show the high and low reached during the time window.
- Body shows only the open-to-close part of that journey.
This distinction is material. Two candles can have the same body size but very different wicks, meaning the open-to-close movement may look similar while the intraperiod extremes differ.
Evidence or example (with explicit assumptions)
Assume one candlestick represents one hour and your chart provides:
- Open = 1.1000
- Close = 1.1040
- High = 1.1060
- Low = 1.0990
Then:
- Candle body size = |1.1040 − 1.1000| = 0.0040
- The upper wick indicates price reached up to 1.1060 before ending at 1.1040.
- The lower wick indicates price reached down to 1.0990 before ending at 1.1040.
From this single example, you can independently verify that the body reflects the end-to-end change, while the wicks reflect intraperiod extremes.
Limitations and risks: what candle body does not guarantee
Several limitations affect how candle body is interpreted:
- Time-frame sensitivity: Candle body depends on the chosen duration. Changing the time window changes open and close values, which changes the body.
- Platform and data differences: Not all platforms compute or display candles identically. Data feed, rounding rules, and chart settings can change the plotted open/close levels, which changes body size.
- Ignoring high/low context: Body size alone ignores what happened between open and close. Wicks can show that the market moved beyond what the body suggests.
- No predictive certainty: Historical relationships do not establish future results. A large body may reflect strong movement within the period, but it does not, by itself, establish what happens next.
A practical failure mode is treating body size as a standalone signal without checking the wicks. Another is comparing body sizes across charts with different time frames or different instruments/quote conventions.
How to verify candle body facts independently
You can verify candle body mechanics directly on a chart:
- Identify the candle’s open and close values shown by the platform.
- Confirm that the body spans only between those two levels.
- Compare the body span to the wicks to ensure you are not mixing open-to-close range with high-to-low extremes.
If you want to go one step further, compare how body and wicks change when you switch the chart time frame (for example, from 1 hour to 4 hours). That test checks whether your understanding stays consistent under different candle constructions.