MACD: What It Shows, and What No Histogram Will Ever Show You

MACD is the difference between two exponential moving averages (usually 12 and 26 periods) plus a signal line (a 9-period average of that difference). It shows whether the shorter average is pulling away from the longer one – i.e. trend momentum – with the lag that comes from the averages themselves.

What it is

Gerald Appel created the indicator in the late 1970s. It has three elements: the MACD line (EMA 12 minus EMA 26), the signal line (a 9-period EMA of the MACD line) and the histogram, the difference between them.

Because all the elements are averages of closing prices, MACD is an average of averages. It smooths out noise, but at the cost of lag.

How people use it

a crossover of the MACD and signal lines as a buy or sell signal
MACD crossing zero as a trend change
divergences between price and the histogram
combining it with other indicators into “systems”

What the research and evidence say

Moving-average crossover rules are among the most studied in the literature. The classic study by Brock, Lakonishok and LeBaron (1992) found predictive value in simple rules on the Dow Jones index from 1897 to 1986, but Sullivan, Timmermann and White (1999) showed that after accounting for the number of rules tested, and on later data, the edge stops being statistically significant. Markets where a rule is widely known quickly “eat” it.

Weaknesses

lag: the crossover appears after much of the move has already happened
in consolidation it generates a series of false crossovers
it knows nothing about volume or who is aggressive
absolute values depend on the instrument's price, so they're hard to compare

What order flow shows

The MACD histogram rises because price rose. Order flow shows why it rose and whether it's still happening: whether the rise is carried by aggressive buying with growing delta, or price is drifting up on thin volume with no sellers. These two situations can produce an identical MACD and a completely different continuation.

Indicators vs order flow

Every indicator and every pattern in this section is built from the same data: a candle's open, high, low, close and sometimes volume. They're derivatives of price, showing the effect rather than the cause. Order flow looks at what price is made of: who was buying and selling aggressively (delta), where limit orders were waiting (the order book) and at which prices the market accepted trade (the volume profile).

On CME futures this data is real and comes from one central market. Spot forex doesn't have it: platforms show tick volume, the number of price changes at a single provider.

To be fair: order flow isn't the Holy Grail. It takes learning, it can be noisy, big players hide some of their orders, and an edge only comes from a process and risk control. But it gives you information that simply isn't on a candlestick chart.

How to use it sensibly

use MACD as a description of momentum on a higher timeframe, not as a trigger
ignore crossovers in consolidation: that's where there are the most of them and they're worth the least
check volume and the reaction at levels before you consider a trend durable

Glossary: MACD
Glossary: Moving average (SMA and EMA)
Atlas of biases: Overfitting
Atlas of biases: Illusory correlation
Order flow: How to read charts from a real market
Also under the microscope: RSI
Also under the microscope: The stochastic oscillator and Stochastic RSI
Also under the microscope: Bollinger Bands

This is the cumulative delta (CVD) in the Hetman Terminal (Balance of Forces). Screenshot from the Hetman Index (IHA) – a training instrument, simulated data. See all the Hetman Terminal tools →

Frequently asked questions

What does a MACD crossover mean?

That the shorter average has moved away from the longer one faster or slower than recently. It's a change in momentum, not a guarantee of a change in direction.

What are the standard MACD settings?

12, 26 and 9 periods. Tuning them to a particular chart usually improves results only on historical data.

Does MACD work on the 1-minute chart?

It's calculated the same way on every timeframe, but short timeframes have more noise and more false crossovers.

Educational content, not investment advice. No signals, entries, stops or position sizes.