Who is it for?
Users who want active concept practice Anyone identifying knowledge gaps
Candlestick Learning
Candle OHLC Lab
Change open, high, low and close values to study candle body, wicks, range, true range, gaps and close location interactively.
FreeNo installationEducational & analytical
Free with a TupTrader account
The tool is ready; sign in to run it
The guide and calculation method stay public on this page. Sign-in is only required to open the interactive workspace.
Tool guide
What can be calculated from a candle’s OHLC values?
OHLC is open, high, low and close. From those prices you can directly measure body, wicks, range and close location; previous close also enables true range.
Logic / formula
Body=|C−O|; range=H−L; upper wick=H−max(O,C); lower wick=min(O,C)−L.
Read the output
Keep objective OHLC measurements separate from pattern or directional interpretation.
TT-FT-019 · versioned engine candle-ohlc@2.0.0 · educational/analytical use; not investment advice.
Full guide, examples, and sources
When should you not rely on it?
Treating a score as proven trading skill Memorising answers without real examples
Logic, formula and methodology
OHLC is open, high, low and close. From those prices you can directly measure body, wicks, range and close location; previous close also enables true range. Body=|C−O|; range=H−L; upper wick=H−max(O,C); lower wick=min(O,C)−L.
OHLC geometry validation, body and wick sizes, ratios, Close Location, Open Location, midpoint, gap, True Range, body direction, visual candle rendering, and structural labels including Doji, Hammer-like, Shooting-star-like, Spinning-top-like, and Marubozu-like.
Worked example
Example
Open=100, High=112, Low=96, and Close=109
The sample OHLC produces measurable body, upper/lower wicks, range and true range; these are measurements, not signals.
The sample OHLC produces measurable body, upper/lower wicks, range and true range; these are measurements, not signals.
How to read the result
The score measures alignment with an educational reference. Mistakes define the next learning step.
Treat body size, wick ratios, close location and gaps as measurements. A large candle or long wick does not guarantee the next direction; separate objective geometry from interpretation.
What the TupTrader version adds
The value of this version is not cosmetic; the result, assumptions and workflow are connected to the practical capabilities below.
- Interactive draggable/typed OHLC
- Body and wick ranges
- True Range with previous close
- Gap visualization
- Price-distance ruler
- Instant visual updates
- Example presets
- Send concept to quiz
Turn the result into a workflow
Related tool →Review missed topics in a related learning tool. Practise the concept on data or a chart. Write your reasoning in the journal.
Common mistakes and limitations
- Repeating solely to raise the score
- Ignoring context
- Turning an educational answer into a signal
- OHLC does not reveal the exact intrabar trade sequence. Very different paths inside a bar can produce the same four prices.
Frequently asked questions
What does a long wick tell me?
It objectively shows that price traded to an extreme and closed back toward the body; cause and future direction require context.
How is true range different from range?
Range is high minus low; true range also considers the previous close to capture gaps.
Is a doji always a reversal?
No. A doji is a small-body geometry; interpretation depends on location, trend, volatility and confirmation.
Sources and research method
This guide combines the tool’s versioned specification, the earlier TupTrader educational page and the authoritative sources below. External sources are used for definitions and scientific boundaries, not for signals.
- CME Group — Chart Types: Candlestick, Line, BarOHLC, candle body and wick anatomy, separating objective price data from pattern interpretation.
This tool is for education, scenario analysis and process control. It is not investment advice, a buy/sell signal or a guarantee of future performance.