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MACD line
The MACD line is the difference between a fast EMA and a slow EMA.
Lesson · Technical Indicators
Moving Average Convergence Divergence
Separate the MACD line, signal line, and histogram; change the three periods; identify zero-line and signal-line events; and name what each component measures.
Synthetic educational data
Core concepts
Understand what the indicator calculates, how its parameters affect it, and what it cannot establish by itself.
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Signal line
The signal line is an EMA of the MACD line, adding another layer of smoothing.
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Histogram
The histogram is MACD minus signal. It shows the distance between the two lines, not trading volume.
Interactive lesson
Change the inputs, inspect the calculation, and compare the indicator with the underlying price data.
PriceSignal-line crossover markers
MACD12, 26, 9
Interpret MACD components
Do not collapse three different calculations into a single vague bullish or bearish label.
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Compare fast and slow EMAs
The sign of the MACD line reflects which EMA is higher.
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Compare MACD with signal
A crossover shows that MACD changed relative to its own smoothed average.
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Read histogram direction
Histogram expansion or contraction describes changing separation between MACD and signal.
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Use price context
Confirm whether the event occurs in a trend, a range, near a structural level, or after a large delayed move.
MACD components and events
Score 0 / 0Choose the best answer.
Lesson rule
MACD combines two layers of exponential smoothing. State whether your rule uses the zero line, signal-line crossover, histogram direction, or a specific combination.
Common mistakes
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Calling the histogram volumeThe bars represent MACD minus its signal line and contain no volume input.
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Treating every crossover as independent evidenceMACD and its signal are derived from the same closing-price series and are highly related.
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Ignoring delayed confirmationA crossover can occur after a substantial part of the underlying move has already happened.
Completion standard
✓
Finish when you can calculate and name every component.
Identify the fast and slow EMAs, calculate their difference, derive the signal line, compute the histogram, and describe the exact event your rule uses.
Calculation note: The course uses EMA periods for fast, slow, and signal calculations, seeded from the first complete simple average. Exact warm-up timing may differ across implementations.