MACD Signal Line Explained: Formula and Purpose
Learn the formula for the MACD signal line and its role as a smoothed reference for the MACD line itself.
- 7 min read
- For beginners
- Educational
- Leçon 3 sur 8
- 1MACD Indicator Explained: A Complete Beginner's Guide
- 2MACD Line Explained: Formula and Meaning
- 3MACD Signal Line Explained: Formula and Purpose
- 4MACD Histogram Explained: Formula and Interpretation
- 5MACD Signal Crossover Explained
- 6MACD Zero-Line Crossover Explained
- 7What Do You Need to Know About MACD Divergence?
- 8Why MACD Should Be Used With Trend and Price Structure?
This lesson explains the signal line, the second core component of the MACD indicator, building directly on the MACD line covered in the previous lesson.
This formula has been verified against multiple technical analysis education sources.
The Signal Line Formula
The signal line is calculated as a 9-period EMA of the MACD line itself (covered in the previous lesson), rather than being calculated directly from price. In effect, it's a moving average of a moving-average-derived value.
Why the Signal Line Exists
Because the MACD line itself can still move somewhat erratically, the signal line applies an additional layer of smoothing, generally making it easier to visually identify turns and shifts in the MACD line, similar in concept to how a moving average smooths raw price data (covered in the previous unit).
The Signal Line as a Reference for the MACD Line
The signal line's primary role is to act as a reference point for the MACD line, enabling the signal crossover concept — comparing whether the MACD line is above or below its own signal line — covered in detail in the next lesson.
The Signal Line Also Lags
As an EMA of the MACD line, the signal line carries an additional layer of lag on top of the lag already inherent in the MACD line itself (which, in turn, is derived from lagging EMAs of price). This layered lag is an important consideration explored further in this unit's discussion of appropriate context.
Summary
The signal line is a 9-period EMA of the MACD line itself, applying an additional layer of smoothing that makes it easier to visually identify turns in the MACD line, and serving as the reference point for the signal crossover concept covered next. Because it's an EMA of an already-lagging value, the signal line carries an additional layer of lag beyond the MACD line alone.
Frequently Asked Questions
A 9-period EMA of the MACD line itself, rather than being calculated directly from price.
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