MACD Signal and Histogram Interpretation
MACD compares a faster exponential moving average with a slower one. Its signal line smooths that difference, and its histogram measures the gap between MACD and the signal line.
How it works
The conventional setting is MACD=EMA12−EMA26, signal=9-period EMA of MACD, histogram=MACD−signal. A zero-line crossover and a signal-line crossover describe different events. MACD uses price units, so absolute values are not directly comparable across instruments with different price levels.
Worked example
If EMA12 is 102 and EMA26 is 100, MACD is 2. If the signal line is 1.5, the histogram is +0.5. At the next observation MACD may rise to 2.1 while its signal rises to 1.9: the histogram falls to +0.2 although MACD itself increased. A shrinking positive histogram therefore does not necessarily mean a falling price.
Amounts, prices and scenarios are fictional teaching examples. They exclude any effects not explicitly stated and are not trade recommendations.
Limits and common mistakes
The two averages and extra smoothing create lag. Sideways markets can generate repeated crossovers, and changes in price scale affect the indicator’s magnitude. A crossover by itself provides no estimate of net trading expectancy.
Knowledge check
Can MACD increase while its histogram decreases?
Read the explanation
Yes. The histogram depends on the difference from the signal line; if the signal line catches up faster, the positive gap narrows.
References and further reading
These sources explain the underlying concepts and specifications. They do not endorse QBMFX Academy. Check the relevant market, protocol version and reporting rules before applying an example.