What’s A MACD?
For those of you with a deep love of spreadsheets here is how the Moving Average Convergence Divergence is calculated:
First you plot the difference of a long term EMA (Exponential Moving Average) (26 day is common) from a short term EMA (12 day is common) and this is your MACD. Then on the same chart you plot an EMA (9 day is common) of the MACD which is called your signal line.
If you don’t feel like doing all that most charting software will do this for you I just like love Excel.
How To Use The MACD?

One uses the MACD to quickly notice cross overs of the longer term and shorter term EMA, trends in the divergence of the short term and long term EMAs, or recognizing points where the divergence between the two EMA has become so large that it historically shows an overbought or oversold condition.
If you look at the chart from left to right the first note of interest is the zero line crossing. This notes the point where the short term moving average has just become equal to the long term moving average. These cross overs indicate a change in direction with momentum just like when we discussed moving average crossovers in a previous post.
The next note of interest is the downward cross. This is where the signal line crosses the MACD. This also indicates a change in stock price direction. Obviously this can be an upward change in direction also.
The final point is the zero line resistance. Just like how a long term moving average can be a support and resistance line for the price of the stock, the zero line or where the two moving averages are equal, often provides support and resistance for the MACD preventing the crossover of the to moving average indicators. This is useful to know because it is often beneficial to wait for the MACD to actually cross the zero line to help reduce the number of times you are whipsawed.
A good trading strategy will use the MACD as one indicator just not the only indicator. RSIand volume are often used in conjunction with other chart patterns, indicators, and fundamental analysis to help create a higher percentage win trading strategy.
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