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FxPro Help Centre - Glossary

MACD (Moving Average Convergence Divergence)

MACD is a popular technical indicator that was developed by Gerald Appel in the 1970s. It is used to indicate changes in the momentum, direction and duration of an underlying asset’s price. MACD focuses on the relationship between two moving averages. The first is called MACD line and it is calculated by subtracting the 26 period EMA (exponential moving average) from the 12 period EMA. The second is known as the signal line and it consists of a 9 period EMA of the MACD line. Both the MACD line and the signal line are plotted over the current price and the difference between them is presented in a histogram beneath the chart being monitored.

MACD works best in trending markets since it can alert traders for subtle changes in the strength and direction of an asset’s trend. There are three main things MACD traders look out for when using this technical indicator.

1. MACD/signal line crossovers: When the MACD line crosses up through the signal line it is a bullish signal indicating the emergence of an upwards trend. When the MACD line crosses down through the signal line it is a bearish signal indicating that a downwards trend is in effect. These crossovers are also clearly visible in the histogram which shows the difference between the two. The point at which they cross over the histogram is to be found at zero because there is no difference between them.

2. MACD/Zero line crossovers: When the MACD line plotted on the histogram crosses the x-axis or zero line then there is no difference between the fast (short period) and slow (long period) EMAs that compose it. An upward move through the zero-line means that the short term EMA is above the long-term EMA, which is considered an indication of a possible bullish reversal. A downward move through the zero-line means that the long-term EMA is above the short-term EMA, which is considered an indication of a possible bearish reversal. It is important to keep in mind that while a zero crossover indicates a trend reversal, it says less about the momentum of this change than a signal-line crossover.

3. When the underlying asset’s price begins to diverge from the MACD line or histogram ( i.e. price action moves either above or below the MACD line or histogram) this can be an indication that a current trend is beginning to break down.