Hook — a candle is four prices, not a prediction

A new learner sees a green rectangular candle with thin lines extending above and below it. The shape looks like a symbol, perhaps even a signal to act. In ordinary OHLC chart construction it is simply a compact description of four numbers over a defined time interval: opening price, highest reported price, lowest reported price and closing price. The thick body connects open and close; the thinner lines, often called wicks or shadows, indicate how far the displayed high and low extended beyond that body. Neither colour nor shape guarantees what the next interval will do. Before reading the candle, ask which instrument is being charted, what its time boundaries are, whether the prices reflect trades or another quote series, and what currency units apply. This lesson teaches arithmetic and data literacy, not a reliable way to time the market.

Learning note

All prices, rates, quantities and outcomes are invented for teaching, not live quotes or recommendations; fees are excluded unless stated. Rupee and dollar examples are independent, not conversions.

Concept in depth — open, high, low, close and aggregation

Open is the first price selected by the data source within the charted interval, and close is the last selected price of that interval. High and low are the extreme reported prices during the same interval according to the chart's rules. The body spans the absolute difference between open and close. A common green or hollow convention indicates close above open; a common red or filled convention indicates close below open, but apps can customize colours and chart modes. The high should not be less than either open or close, and the low should not exceed either endpoint if OHLC values are constructed consistently. Some platforms use last-trade prices, others bid, ask or indicative references; missing data, session openings and aggregation rules can change the image. Heikin-Ashi and other transformed candles use calculated values rather than exactly the same raw OHLC representation. Thus first verify the displayed chart type. CME chart education.

Concept 1

Each ordinary candlestick summarizes one completed interval with O=open, H=highest, L=lowest and C=close. The high must be at least as high as open and close; the low must be at most as low as both. Source 1 · Source 2 Desi example: A vegetable mandi clerk records the first, highest, lowest and last potato price during one hour. ILLUSTRATIVE ONLY — worked example: Fictional rupee candle: O ₹100, H ₹108, L ₹96, C ₹105. Range = ₹108 − ₹96 = ₹12; the close is ₹5 above the open.

Concept 2

The thick body connects open and close; upper and lower thin wicks show the extremes. For an up candle, upper wick = high − close and lower wick = open − low; software color settings can differ. Source 1 · Source 2 Desi example: A flour seller draws a thick mark between first and final price, then thin lines to the day's highest and lowest offer. ILLUSTRATIVE ONLY — worked example: With O ₹100, H ₹108, L ₹96, C ₹105: body = ₹105 − ₹100 = ₹5; upper wick = ₹108 − ₹105 = ₹3; lower wick = ₹100 − ₹96 = ₹4.

Concept 3

A close below open is a down candle; color is a display convention, not a forecast. A small body only means open and close were near each other. Alternative candles such as Heikin-Ashi use transformed values, so check chart type. Source 1 · Source 2 Desi example: A dhaba's rice price begins high, moves around and ends a little lower; the final bill cannot tell tomorrow's price. ILLUSTRATIVE ONLY — worked example: Separate fictional dollar candle O $50, H $52, L $46, C $48: body = $50 − $48 = $2, upper wick = $52 − $50 = $2, lower wick = $48 − $46 = $2; nothing predicts the next candle.

How it works — label the geometry before describing the colour

Write an example's four values in an OHLC table and check that high is at least as large as both open and close, and low is at most as small. Determine which of open and close is greater; that decides which endpoint belongs at the top of the body. Calculate body length as absolute(close minus open). Calculate the upper wick as high minus max(open, close), and lower wick as min(open, close) minus low. These distances cannot be negative in a valid ordinary candle. Label every number with the same price unit and the same interval. Before interpreting the result, determine if the source is a daily, five-minute or other candle and whether its closing time has actually passed. An incomplete candle can change shape repeatedly until the interval ends. These checks let students discuss a shape without inventing the sequence of all transactions inside it.

Desi example — the mandi's price diary

Imagine a fictional vegetable seller tracking the price of one crate during a market morning. The first written price is ₹100, the highest displayed is ₹108, the lowest is ₹96 and the last price is ₹105. Four numbers fit in one little diary entry. A candlestick summarizes this entry visually: a body from ₹100 to ₹105 and wicks reaching ₹108 and ₹96. The chart does not say whether the low happened before the high or whether many crates changed hands at either extreme. The merchant might have sold at different prices and paid transport or labour expenses; none can be inferred from the candle alone. A second seller with a different market opening time could produce a different candle from genuine observations. The analogy teaches the difference between a summary and a full chronological transaction record.

ILLUSTRATIVE ONLY — body and two wick calculations

Consider invented OHLC values: open ₹100, high ₹108, low ₹96 and close ₹105. Since close exceeds open, the body is ₹105 − ₹100 = ₹5 and often shown green. The upper wick is ₹108 − max(₹100, ₹105) = ₹3. The lower wick is min(₹100, ₹105) − ₹96 = ₹4. The full high-to-low range is ₹108 − ₹96 = ₹12. Now reverse the endpoints in a separate fictional candle: open ₹105, high ₹108, low ₹96, close ₹100. The body length remains ₹5, upper wick remains ₹3 and lower wick remains ₹4, but the common colour changes because close is below open. This demonstrates why lengths alone do not identify the direction of the close relative to the open. In an independent dollar example, open $19 and close $22 give a $3 body, with no implied conversion to rupees. All values are fabricated for the worksheet.

Key points

- OHLC means open, high, low and close for one interval. - The body spans open-to-close; wicks reach high and low. - Candle shape describes history, not the next price.

Common mistakes

- Reading green/red colors without checking chart settings. - Treating a long wick as a guaranteed reversal.

Common Mistakes — shape does not reveal all price order

A common error is assuming the upper wick necessarily occurred after the lower wick or that one wick proves buyers or sellers 'won' in a verified causal sense. OHLC records four extrema and endpoints, not the chronological order of every intraperiod trade. Another error is calculating the upper wick from high minus open even when close is above open; the correct reference is the body's higher endpoint. Students may describe the candle as final while the period is still open, causing its close and high/low to change later. A dramatic wick can arise in thin markets, from one exceptional trade, a provider's quote series or a data issue. It cannot by itself guarantee the next candle's direction or a successful position. Candle colour settings can also be inverted by the user, so verify data rather than memorizing red and green as universal conventions.

Real-world-style scenario — a suspiciously long wick

An imaginary news editor receives a chart screenshot from an anonymous source showing one extremely long downward wick. The sender says it proves manipulation and that everyone could have purchased at the lowest price. Neither conclusion follows from an unlabeled candle. The apparent low might represent a single transaction, an indicative quote, an outlier, or even a data error; its basis must be verified. The chart also lacks the instrument's source, timestamp, session and whether the candle was complete. The editor can report that the supplied image depicts a low below the body, but causal allegations require independent evidence. For a responsible classroom analysis, check the four numerical OHLC values, the provider's chart type and corroborating data from independent reputable sources. Mark unresolved claims NEEDS-REVIEW rather than turning a geometric observation into financial advice.

Summary and recap — compute four numbers, avoid a forecast

An ordinary candlestick summarizes opening, highest, lowest and closing reference prices in a defined interval. The body is the absolute difference between close and open. The upper wick is high minus the greater of open and close, and the lower wick is the smaller of open and close minus low. A green or red convention indicates the relationship between close and open, not where the price must go next. Four values do not reveal the precise intraperiod path, execution availability, fees or a trader's gains. A complete reading names the instrument, time interval, quote type, source and currency units. The invented ₹100/₹108/₹96/₹105 example teaches the geometry only. It is not a live price pattern or an invitation to buy or sell.