MACD Histogram Explained:
Formula and Interpretation
Learn the formula for the MACD histogram and how it visually represents the gap between the MACD line and signal line.
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This lesson explains the MACD histogram, the third core component of the indicator, visually representing the relationship between the MACD line and signal line covered in the previous two lessons.
This formula has been verified against multiple technical analysis education sources.
The MACD Histogram Formula
The MACD histogram is calculated as: Histogram = MACD Line − Signal Line. This produces a value plotted as vertical bars, oscillating above and below a zero line, similar in visual style to the volume bars covered in the earlier Volume Analysis unit, though representing a completely different underlying calculation.
What the Histogram Represents
When the histogram is positive, the MACD line is above the signal line; when negative, the MACD line is below the signal line. The height of each histogram bar reflects the size of the gap between the two lines at that point — taller bars indicate a larger gap, and shorter bars indicate the two lines are closer together.
Histogram Expansion and Contraction
A histogram that is expanding (bars getting progressively taller) is commonly discussed as reflecting growing momentum in the direction the histogram is pointing, while a contracting histogram (bars getting progressively shorter) is commonly discussed as reflecting weakening momentum, potentially preceding a signal line crossover, covered in the next lesson.
Why the Histogram Is Sometimes Viewed as an Earlier Signal
Because the histogram reflects the gap between the MACD and signal lines directly, some technical analysis education discusses histogram contraction as providing earlier visual warning of a potential upcoming signal line crossover, before the crossover itself actually occurs. This is a commonly discussed observation, not a guaranteed early-warning system.
🔖 Summary
The MACD histogram, calculated as the MACD line minus the signal line, visually represents the gap between these two lines as vertical bars, with expansion commonly discussed as reflecting growing momentum and contraction reflecting weakening momentum. Since it reflects this gap directly, histogram contraction is sometimes discussed as providing earlier visual warning of an approaching signal line crossover, covered in the next lesson.
Frequently Asked Questions
What is the MACD histogram formula?
Histogram = MACD Line − Signal Line, plotted as vertical bars oscillating above and below zero.
What does the histogram's height represent?
The size of the gap between the MACD line and signal line — taller bars mean a larger gap, shorter bars mean the lines are closer together.
What does an expanding histogram commonly suggest?
Growing momentum in the direction the histogram is pointing.
Why might the histogram provide an earlier signal than a crossover?
Since it reflects the gap directly, contraction can sometimes provide earlier visual warning of an approaching signal line crossover, though this is a commonly discussed observation, not guaranteed.
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