MACD Indicator: Signal Line Crossovers, Histogram and Zero Line
The MACD (Moving Average Convergence Divergence) tracks the gap between a fast and a slow moving average. It shows both the direction of the trend and whether momentum is building or fading.
The three parts
- MACD line: 12-period EMA minus 26-period EMA
- Signal line: 9-period EMA of the MACD line
- Histogram: MACD line minus signal line, showing momentum speeding up or slowing down
Crossovers
When the MACD line crosses above the signal line, short-term momentum is turning up; crossing below means it is turning down. Crossovers above the zero line, in the direction of the bigger trend, are generally more reliable than those against it.
The zero line
The MACD is above zero when the 12 EMA is above the 26 EMA, meaning the short-term trend is up. A cross of the zero line is a slower but stronger confirmation of a trend change.
Histogram
A shrinking histogram warns that momentum is fading before the actual crossover. Some traders tighten their stops when the bars start shrinking.
Limits
MACD lags because it is built from moving averages, and in sideways markets it flips back and forth. Pair it with price levels (support and resistance) and always define your stop.
Common mistakes
- Trading every crossover in a sideways market
- Ignoring the zero line and the higher-timeframe trend
- Using MACD values to compare different assets (they are in price units)
Free tools for this strategy
Trading journal · Risk/reward calculator
Open the Trading journal →Frequently asked questions
What are the best MACD settings?
The default 12, 26, 9 is by far the most used. Changing settings rarely fixes the indicator's main weakness, which is lag.
Is MACD better than RSI?
They measure different things. MACD is better at trends, RSI at stretched moves. Many traders use both.