I just summarized what I know about MACD nicely, and I want to share the highlight I think is most important—understanding what the MACD histogram actually is.

Actually, the MACD histogram isn’t complicated at all. It’s simply the difference between the MACD line and the Signal Line. If the MACD histogram is positive, it means the MACD is higher than the Signal Line, indicating a strong uptrend. If it’s negative, it indicates a downtrend.

What makes the MACD histogram truly useful is looking at its slope. If a positive histogram starts to have smaller values, it means the uptrend is weakening. On the other hand, if the negative histogram is increasing in speed (i.e., accelerating), it indicates that the downtrend is getting stronger.

The most important point is when the MACD histogram equals zero. This is a critical moment when the MACD crosses the Signal Line exactly. If the histogram starts from positive and changes to negative, it indicates that the trend is shifting from an uptrend to a downtrend, and that can be a good sell signal. Conversely, if the histogram changes from negative to positive, it’s a buy signal.

A basic way to use the MACD histogram is Zero Cross—look at the point where it crosses the Central Line upward or downward. When the MACD crosses the Central Line upward, the histogram will begin to be positive, indicating that the trend is turning into an uptrend. When it crosses downward, the histogram becomes negative, indicating a downtrend.

For a more accurate method, look at MACD Cross Over with the Signal Line. This is faster than Zero Cross because the MACD histogram indicates changes earlier. If the MACD crosses above the Signal Line, the histogram will start to turn positive—even if the MACD hasn’t yet crossed the Central Line.

Divergence is also interesting. When the price keeps rising but the MACD histogram is decreasing, it indicates that momentum is weakening, which is a sign that the trend may be ending—this is Bearish Divergence. On the other hand, if the price keeps falling but the histogram doesn’t increase in negativity (doesn’t become more negative), that’s Bullish Divergence.

A practical tip is: don’t use the MACD histogram by itself. You need to use it together with other tools, such as RSI or Bollinger Band. If you trade using multiple indicators together, accuracy will improve a lot. Personally, I like to use the MACD histogram with RSI to confirm signals.

In summary, the MACD histogram is a simple yet effective tool. Once you understand how it works, you can use it well to support your trading. Just remember that it’s a lagging indicator, meaning it gives signals later than the actual price movement—so it should be used alongside other tools to make your trading system stronger.