MACD, short for moving average convergence divergence, is a momentum indicator that tracks the relationship between two exponential moving averages of price. In the late 1970s, Gerald Appel developed it. Beneath a price chart it displays as two lines and a histogram, and among crypto trading platforms it is one of the most common indicators, which is a statement about popularity rather than predictive power.
The three parts of MACD
Everything on a MACD display comes from two moving averages.
The MACD line. The 12-period exponential moving average minus the 26-period exponential moving average. When the shorter average is above the longer, the line is positive. When below, negative.
The signal line. A 9-period exponential moving average of the MACD line itself, which smooths it.
The histogram. The gap between the MACD line and the signal line, drawn as bars. Growing bars mean the two lines are separating. Shrinking bars mean they are converging.
Appel's original settings, those three defaults of 12, 26, and 9 remain the standard on almost every charting tool.
What MACD measures
Whether recent price movement is accelerating or slowing relative to the medium-term trend.
A 12-period average reacts faster than a 26-period one. When price rises quickly, the fast average pulls away from the slow one and the MACD line climbs. When the rise slows, the fast average drifts back toward the slow one and the line falls, even if price is still going up.
Here is the useful part. Before price turns, MACD can show momentum fading.
The three MACD signals traders watch
| Signal | What happens | Conventional reading |
|---|---|---|
| Signal line crossover | MACD line crosses above or below the signal line | Above is bullish, below is bearish |
| Zero line crossover | MACD line crosses above or below zero | Above means the fast average is over the slow one, a trend shift |
| Divergence | Price and MACD move in opposite directions | Momentum is weakening beneath the price move |
Most watched and least reliable are crossovers. In a sideways market the lines cross repeatedly, producing a string of false signals. Because it describes a change in the move's character rather than just its extent, divergence is treated as stronger.
Where MACD fails
Honestly, since the failures are the useful part.
Lag. MACD is built from moving averages, which are averages of past prices. By the time it signals, part of the move has happened. This is inherent, not a flaw in the settings.
Choppy markets. Sideways price produces repeated crossovers with no follow-through. A trader acting on every signal pays fees and spread for nothing.
Unbounded scale. Unlike RSI, MACD has no fixed range, so there is no "overbought" level. A reading that looks extreme on one asset is ordinary on another.
Thin markets. On a small-cap token with few trades, the averages reflect noise rather than participation.
Alone. Studies of MACD as a standalone system across liquid markets find results that do not survive transaction costs.
MACD vs RSI
Both are momentum indicators built from price. In shape, they differ.
RSI is bounded from 0 to 100 and describes how stretched recent movement is. MACD is unbounded and describes whether the short-term average is pulling away from or toward the medium-term one.
Frequently traders use both, since agreement between them is treated as more meaningful than either alone. Disagreement is treated as a reason to wait.
MACD settings and why the defaults persist
For daily charts of equities in the 1970s, Appel's 12, 26, and 9 were chosen.
With shorter settings, the indicator gets faster and noisier. With longer, smoother and laggier. To suit continuous markets, some crypto traders shorten the windows. Others argue the defaults remain widely watched precisely because they are widely watched, which makes them self-reinforcing.
No setting predicts better. Each describes recent movement differently.
What MACD does not tell you
- Nothing about the future. It summarizes what averages of past prices did.
- Nothing about volume. Price-only, which is why traders pair it with volume.
- Nothing absolute. Without a bounded scale, "high" and "low" are relative to the asset's own history.
- Nothing in a range. Sideways markets generate signals that mean nothing.
- Nothing that beats costs on its own. The evidence is consistent on that point.
Track this on mb.io
Indicators are only as good as the price data feeding them, and that data is a property of the venue.
mb.io is a regulated crypto spot exchange backed by MultiBank Group, a financial institution founded in 2005 that serves more than 2 million clients across 100+ countries.
- Regulated by VARA in the UAE and AUSTRAC in Australia
- Real-time price charts and market data in one clean view
- 10/10 security score from Hacken, an independent blockchain security auditor
- Institutional-grade MPC custody powered by Fireblocks, with segregated client funds
- Buy, sell, and swap in three steps, from sign-up to purchase
- 24/7 multilingual client support
Open your account and start trading on mb.io.
Frequently asked questions
What does MACD stand for?
Moving average convergence divergence. It tracks the gap between a 12-period and a 26-period exponential moving average, smoothed by a 9-period signal line, and was developed by Gerald Appel in the late 1970s.
How do I read MACD?
Watch three things: the MACD line crossing the signal line, the MACD line crossing zero, and divergence between MACD and price. Crossovers are the most common signal and the least reliable in sideways markets.
What is a MACD crossover?
When the MACD line crosses above or below the signal line. Above is conventionally read as bullish momentum, below as bearish. In choppy markets the lines cross repeatedly with no follow-through.
What is the MACD histogram?
Bars showing the gap between the MACD line and the signal line. Growing bars mean momentum is accelerating in the current direction. Shrinking bars mean it is fading.
Is MACD a leading or lagging indicator?
Lagging. Built from moving averages of past prices, it signals after part of any move has happened. Earlier than crossovers, divergence can flag fading momentum.
What are the best MACD settings for crypto?
By default, 12, 26, and 9. Faster and noisier with shorter settings. Smoother and laggier with longer. No setting predicts better, and the defaults persist partly because they are widely watched.
What is the difference between MACD and RSI?
RSI is bounded from 0 to 100 and measures how stretched recent movement is. MACD is unbounded and measures whether a short-term average is pulling away from a medium-term one. Both are price-only momentum indicators.
Does MACD work on its own?
Studies across liquid markets consistently find MACD as a standalone system does not beat transaction costs. Traders use it alongside volume, support and resistance, and other indicators rather than in isolation.
