MACD Explained: Reading Momentum and Crossovers

MACD (Moving Average Convergence Divergence) is a momentum indicator built from moving averages, used to spot changes in trend strength and direction.

The three parts

The MACD line is the difference between a 12-period and 26-period EMA. The signal line is a 9-period EMA of the MACD line itself. The histogram shows the gap between the MACD line and the signal line as vertical bars, making momentum shifts easier to see visually.

Reading crossovers

When the MACD line crosses above the signal line, it’s often read as bullish momentum building. When it crosses below, it’s often read as bearish momentum building. These crossovers are one of the most commonly watched signals from the indicator.

Reading the histogram

A growing histogram (bars getting taller) suggests momentum is strengthening in the current direction. A shrinking histogram suggests momentum is fading, even if price is still moving the same way — sometimes an early warning of a potential reversal.

Zero-line crossovers

When the MACD line crosses above zero, it suggests the shorter-term average has moved above the longer-term average — often read as confirmation of an uptrend, and vice versa below zero.

Key takeaway

MACD combines trend and momentum information in one indicator, but like RSI, it works best combined with price action or support/resistance analysis rather than used entirely on its own.