What Is the MACD Indicator?
MACD is a popular momentum-and-trend indicator. Here’s how it works and how traders use its signals.
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MACD (Moving Average Convergence Divergence) is one of the most widely used technical indicators, combining trend and momentum in a single tool.
How MACD is built
It uses moving averages:
- MACD line — the difference between a fast and a slow exponential moving average (commonly 12 and 26 periods).
- Signal line — a moving average of the MACD line (commonly 9 periods).
- Histogram — the gap between the MACD line and signal line, showing momentum visually.
Reading the signals
- Crossover — when the MACD line crosses above the signal line, it’s a bullish signal; crossing below is bearish. The most-watched MACD signal.
- Zero line — MACD above zero means the fast average is above the slow (uptrend bias); below zero, a downtrend bias.
- Divergence — if price makes a new high but MACD doesn’t (or vice versa), momentum may be weakening before price turns — a powerful early warning.
- Histogram — growing bars show strengthening momentum; shrinking bars, fading momentum.
Caveats
- MACD is a lagging indicator (built from moving averages), so signals come after a move begins and it whipsaws in sideways markets.
- It’s best used with price action, trend and volume — not as a standalone trigger.
MACD is a solid all-rounder for gauging trend and momentum, especially crossovers and divergence. Combine it with context. Education only, not advice.
