What is MACD?
MACD defined—MACD line, signal line, histogram, crossovers, and how traders use MACD with key levels and invalidation.
MACD (Moving Average Convergence Divergence) is a momentum indicator built from exponential moving averages. It shows whether short-term momentum is accelerating or decelerating relative to a longer baseline—and whether that shift is strengthening or weakening.
This glossary defines the three MACD components traders see on every chart. For entry, exit, and strategy examples, see MACD strategy: entry and exit.
The three MACD components
| Component | What it is | How traders read it |
|---|---|---|
| MACD line | Difference between 12-period and 26-period EMAs | Above zero = bullish momentum bias; below zero = bearish |
| Signal line | 9-period EMA of the MACD line | Crossovers with the MACD line mark momentum shifts |
| Histogram | MACD line minus signal line | Bar height shows momentum strength; shrinking bars = fading momentum |
Default settings (12, 26, 9) are Wilder-standard on most platforms. You can adjust them, but change all three together—not in isolation.
Key MACD terms
| Term | Definition |
|---|---|
| Bullish crossover | MACD line crosses above the signal line—often read as momentum turning up |
| Bearish crossover | MACD line crosses below the signal line—often read as momentum turning down |
| Zero line | MACD at 0; separates positive vs. negative momentum relative to the EMA spread |
| Divergence | Price makes a new extreme but MACD/histogram does not confirm |
Crossovers are events, not complete trade plans. Always add structure, invalidation, and risk context.
MACD vs. RSI
| Indicator | Focus | Best for |
|---|---|---|
| MACD | Trend and momentum direction via EMA spreads | Spotting momentum shifts and trend continuation |
| RSI | Speed and stretch on 0–100 | Overbought/oversold and divergence warnings |
Many traders use both: MACD for direction, RSI for stretch at key levels. See RSI trading explained.
How to use MACD without overtrading
- Filter by higher-timeframe trend — trade crossovers in the direction of daily or 4H structure
- Wait for level confluence — MACD crossover at support/resistance beats mid-range noise. See support and resistance
- Watch the histogram — shrinking bars before a crossover can warn of weak follow-through
- Set invalidation — where is the thesis wrong if price reverses? See invalidation points
ChartGuru surfaces MACD in multi-indicator reads with confidence and invalidation—research support, not blind signals.
FAQ
What is the MACD line?
The MACD line is the difference between a 12-period EMA and a 26-period EMA of price. It tracks short-term vs. longer-term momentum.
What does the MACD histogram show?
The histogram plots MACD minus signal. Rising bars mean widening momentum; falling bars mean momentum is fading even if price still moves.
Is a MACD crossover a buy or sell signal?
It is a momentum shift marker. A complete plan still needs trend context, entry level, stop/invalidation, and target.
What settings should I use for MACD?
12, 26, 9 is the standard. Day traders sometimes use faster settings; swing traders may prefer defaults on daily charts.
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This article is for educational and informational purposes only. Nothing here constitutes personalized investment advice or a recommendation to buy or sell any financial instrument. All trading involves risk of loss.