MACD stands for Moving Average Convergence Divergence. It compares a fast moving average of price with a slower one, so you can see whether short-term momentum is pulling ahead of the longer trend or fading back toward it.
On this page4 sections
The three parts
- MACD line: the 12-period exponential moving average minus the 26-period one. Above zero, the faster average is above the slower one.
- Signal line: a 9-period average of the MACD line, used as a smoother reference.
- Histogram: the gap between the MACD line and the signal line, drawn as bars. Growing bars mean momentum is building.
How swing traders read it
- Trend context: MACD above zero supports an existing uptrend. It is evidence, not a trigger.
- Momentum returning: during a pullback in an uptrend, the histogram shrinks. When the bars start growing again, momentum is returning in the trend's direction.
- Crossovers: the MACD line crossing above the signal line is the classic reading, but on its own it produces many false starts.
A worked example (hypothetical chart)
A hypothetical stock is in an uptrend with MACD well above zero. It pulls back for six days toward a rising 50-day average and a support zone. The histogram shrinks toward zero but the MACD line stays above zero. Then price prints a strong up day off support and the histogram ticks higher. The trader's setup is the support zone; MACD is supporting evidence. The stop still goes below the support zone, not at an indicator level.
Common mistakes
- Treating every crossover as a buy.
- Stacking MACD with RSI and other momentum tools that repeat the same information.
- Forgetting that MACD is built from price and always lags it.
Read price first, MACD second. If you want one momentum tool, also see our note on RSI above 50 in an uptrend.
Education only, not financial advice. No indicator works every time.
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