MACD Indicator Explained
Understand how MACD uses moving averages to show trend momentum, signal-line crosses, and histogram changes.
Common Formula
MACD line = 12-period EMA - 26-period EMA
What MACD measures
MACD compares two exponential moving averages to estimate trend momentum. The default MACD line subtracts the 26-period EMA from the 12-period EMA, then adds a 9-period signal line and a histogram showing the gap between them.
How traders read it
A MACD line above the signal line can point to improving momentum, while a move below the signal line can point to weakening momentum. Crosses near the zero line often carry different context than crosses after a large extended move.
Why the histogram helps
The histogram makes momentum changes easier to scan. Expanding bars show the MACD line pulling away from the signal line, while shrinking bars show the gap narrowing.
Best Used For
- Tracking trend momentum
- Watching signal-line crosses
- Seeing momentum expand or fade with the histogram
Common Mistakes
- Reacting to every cross in a choppy market
- Forgetting MACD is based on lagging averages
- Using default settings without considering timeframe
Practice on real charts
Use indicators as a research layer on top of price, volume, source timestamps, and market context. ProStockCharts pages are for research and education, not investment advice.