MACD Explained: Line, Signal, Histogram and Divergence
MACD is two moving averages wearing a disguise. Once you see that, everything it does - crossovers, the histogram, divergence - is just a restatement of how momentum is changing.
MACD is the 12-period EMA minus the 26-period EMA, with a 9-period EMA of that as the signal line and the gap between them drawn as a histogram. Above the signal line reads as strengthening momentum, below as weakening. Divergence means the latest push had less force, not that price will reverse: strong trends diverge repeatedly and keep going.
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Open the live chart →The three parts
- MACD line: the 12-period EMA minus the 26-period EMA. It is the distance between a fast and a slow average, so it rises when short-term momentum is stronger.
- Signal line: a 9-period EMA of the MACD line - a smoothed version of the same thing.
- Histogram: the gap between the two. It shrinks as momentum fades and flips sign at a crossover.
12, 26 and 9 are the defaults from Gerald Appel's original work. Faster settings produce more signals; the trade-off is identical to any other moving average choice.
What people read from it
- Crossovers: MACD above the signal line is read as strengthening momentum, below as weakening.
- Zero line: above zero means the fast EMA is above the slow one - an uptrend by that definition.
- Divergence: price makes a higher high while MACD makes a lower one, which says the second push had less force behind it.
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- Divergence is not a reversal signal. Strong trends diverge repeatedly and keep going. Fading a trend on divergence alone is one of the most reliable ways to lose money with an indicator.
- It lags. Everything in MACD is built from averages, so every signal describes the past.
- Ranges produce constant crossovers, exactly as with a moving average crossover.
- It is not bounded. Unlike RSI there is no fixed overbought level; a big value only means the averages are far apart, which is normal in a strong move.
- Different instruments, different scales. MACD values are in price units, so they are not comparable between markets.
A sensible way to use it
Treat MACD as a momentum description that supports or contradicts what the chart already shows: take the setup at a level, check whether momentum agrees, and let the risk rules do the rest. The signal is the context, not the trade.
ema(close,12) - ema(close,26),
if you want it. The live-chart link on this page opens a chart, not a MACD.Frequently asked questions
What does MACD stand for?
Moving Average Convergence Divergence. It measures the distance between a 12-period and a 26-period EMA, with a 9-period EMA of that as the signal line.
What are the best MACD settings?
12, 26 and 9 are the defaults and are what most traders see. Faster settings give earlier and noisier signals; there is no setting that removes the lag.
Is MACD divergence reliable?
It is a warning that momentum has weakened, not a reversal signal. Trends can diverge for a long time before turning, and many divergences never resolve into a reversal.
Is MACD better than RSI?
They measure different things - MACD measures the gap between averages, RSI measures the speed of recent gains against losses. Neither replaces a plan with a defined stop and size.
Keep learning
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