What you will learn
- Tell apart the MACD line, the signal line and the histogram
- Read crossovers and understand their lag
- Find divergence between price and the histogram
- Choose settings that fit the timeframe
IdeaMACD — trend strength and reversal
MACD catches the moment when a trend changes strength. It has two lines — the fast one (MACD) and the signal — plus a histogram of bars between them.
The lines cross from below upward — momentum is turning up. From above downward — down. The histogram shows who's stronger right now.
Analogy. Two cars on a highway. The fast one overtakes the slow one — acceleration up; it falls behind — it loses speed. MACD catches the moment of overtaking.
Important. MACD lags (it's built on averages). In a range it gives frequent false crossovers — it's more reliable in a trend and as confirmation to other factors.
AnatomyBreak MACD down into parts
Mint is MACD, violet is the signal, the bars are the histogram. Tap all three points and open them to complete the step.
- Crossover
- MACD crossed the signal — a momentum change
- Histogram sign flip
- The bars went negative — strength is fading
- Zero line
- Above zero — bulls, below — bears
This is an exercise from the lesson. You can run it on a live chart in the terminal, where progress is recorded.
Try it on the chartSee it liveThe overtaking of lines launches momentum
On the left both lines are down, below zero — the market is falling. Then MACD crosses the signal from below upward, the histogram turns green — growth begins.
On the right the lines run out of steam, the histogram goes negative — the growth momentum is ending.
PracticeCrossover from below upward
MACD crossed the signal from below upward. What signal is this?
This is an exercise from the lesson. You can run it on a live chart in the terminal, where progress is recorded.
Try it on the chartPracticeBuild an entry by MACD
Put the steps in order — click them one by one.
- Wait for a MACD crossover from below upward
- Confirm: the histogram is growing (bars lengthen)
- Check MACD rising above zero
- Enter long on confirmation
This is an exercise from the lesson. You can run it on a live chart in the terminal, where progress is recorded.
Try it on the chartRecapCheck off what you've learned
- I understand MACD's two lines and the histogram
- I read a crossover as a momentum change
- I know the meaning of the histogram's sign flip
- I tell apart the zones above and below zero
This is an exercise from the lesson. You can run it on a live chart in the terminal, where progress is recorded.
Try it on the chartWhat the indicator is made of
The MACD line is the difference between a fast and a slow moving average (12 and 26 by default). When the fast one pulls away from the slow one, the difference grows and the line rises: the move is accelerating. When they converge, the line heads toward zero: momentum is fading.
The signal line is a moving average of the MACD line itself (usually 9). Its only job is to provide a reference: a crossing shows that the rate of change has changed.
The histogram is the difference between those two lines — the rate of change of the rate of change. It is the most useful part to read: it turns before the lines and before price.
Zero-line and signal-line crossings
Two different events that are often confused. A signal-line crossing is the fast one: momentum has shifted. A zero-line crossing is slower and weightier: the fast and slow averages have swapped places, meaning the trend itself has changed.
In practice it makes sense to use them together: the zero line sets the side, the signal line sets the moment. Trading signal crossings alone means a dozen signals a week, half of which get cancelled.
A word on lag. The MACD is built on moving averages, and moving averages look backward by definition. By the time the indicator confirms a turn, part of the move has already happened. That is not a settings flaw but a property of the method — you cannot speed it up, only account for it.
Histogram divergence
The most valuable thing the MACD offers. Price prints a new high while the histogram bars at that high are lower than at the previous one — the move continues but with less acceleration. That is an early sign a trend is running out.
As with RSI, divergence here is not an instruction. A strong trend produces several in a row. It works as a reason to pay attention, and especially well together with the level price has reached.
The 12/26/9 settings were devised by Gerald Appel for daily charts and remain a sensible default. On lower timeframes they are sometimes sped up, but the number of false crossings grows — the price of speed is always the same.
Where MACD gets it wrong
In a range, constantly. The histogram oscillates around zero, crossings follow one another, and each looks like a signal. The reason is the same as for moving averages: there is nothing to follow.
On sharp news moves it simply cannot keep up: a single candle covers a distance the MACD needs several periods to register.
And most importantly: the MACD shows no levels. It speaks about the strength of a move and says nothing about where that move will stop. Stops and targets are not set from it.
Frequently asked questions
- What does MACD show in simple terms?
- Whether a move is accelerating or running out. It measures the distance between two moving averages: a growing distance means strengthening momentum, a shrinking one means it is fading.
- What does a MACD signal-line crossover mean?
- That the rate of the move has changed. Upward means momentum strengthened to the upside, downward to the downside. It is a fast signal, and in a range it is frequently false.
- Which MACD settings are best?
- The standard 12/26/9 is a sensible default for most timeframes. Speeding it up gives more signals at the cost of more false ones; there is no universally better set of values.
- Why does MACD lag?
- It is built on moving averages, which average the past by definition. This is a property of the method, not a settings error: you cannot remove the lag and keep the smoothing.
Other lessons in this track
- VolumeHow to read trading volume and use it to confirm price moves.
- EMAMoving averages 20/50/100/200 as trend support and resistance.
- RSIOverbought, oversold, and divergences.
- Structural MarkupRemove the noise and see the key peaks and troughs.
- FractalsLocal extremes by Bill Williams.
- Trading sessionsAsia · London · New York and their character.
- WeekendWhy weekends are dangerous: thin liquidity and gaps.
Terms covered
This material is educational and is not individual investment advice.