What MACD is and when it is worth using

MACD combines trend-following and momentum measurement. It is useful in particular situations and
misleading in others — telling the two apart is the whole problem.

1. What it is made of

• The MACD line — the 12-period EMA minus the 26-period EMA. It measures the gap
  between the short and medium-term trend.
• The signal line — a 9-period EMA of the MACD line itself.
• The histogram — the difference between those two, drawn as bars.

All three derive from moving averages, so MACD
inherits both their strengths and their weaknesses — the largest of which is lag.

2. Three signals, and how much each is worth

The line crossover

MACD crossing above the signal line is a buy; below, a sell. This is the most common use and also
produces the most false signals, especially in a range.

The zero-line cross

MACD rising above zero means the 12 EMA has crossed the 26 — confirmation that the trend has turned.
Slower, but more reliable than the line crossover.

Divergence

Price makes a higher high while MACD makes a lower high: momentum is fading even as price rises.
This is the most valuable use of MACD, though it still needs a confirming condition.

3. Reading the histogram

The histogram is usually ignored, but it gives the earliest signal. Contracting bars mean the two
lines are converging — a crossover is approaching. That is a warning several candles before the
crossover itself.

4. When MACD works well

• In a clearly trending market.
• On timeframes of H4 and above, where there is less
  noise.
• As a confirmation tool for an idea you already formed from price analysis.

5. When to switch it off

• A ranging market — MACD will cross back and forth continuously and every signal will be wrong.
• Low timeframes — the lag means signals arrive after the opportunity has gone.
• Right after a sharp move — the indicator needs time to catch up, and in the meantime it reads
  wrong.

6. Something true of every indicator

MACD is calculated entirely from past price. It contains no information the price chart does not
already hold — it simply presents that information differently. So it cannot predict; it can only
describe what has happened, more compactly.

The practical consequence: do not stack three or four indicators from the same family and then treat
their agreement as evidence. They agree because they are all computed from the same data.

This article is for information only and is not investment advice. Conditions and fee levels are published by the brokers and can change at any time — check with the broker you actually use. Leveraged forex and CFD trading carries a high level of risk and can cost you your entire deposit.