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MACD line, signal line, histogram — each of the three does a different job
Published by The Retail Trader · AUG 09, 2026 · Features
MACD looks complicated because it has three parts, but the idea behind it is a single line: is the gap between two moving averages widening or narrowing.
What you see on the chart:
• MACD line — the difference between a fast average and a slow average. This itself is momentum.
• Signal line — an average of the MACD line itself. It smooths the MACD and makes a reference for it.
• Histogram — the gap between MACD and signal, in bars. This changes the earliest.
MACD above zero means the fast average is above the slow one — that is, the medium-term lean is up. Below zero, the reverse.
So crossing the zero line is a crude sign of a change in the trend's character, and staying above or below it shows the direction of the trend.
If the histogram bars start getting smaller — even while they are still above zero — it means the push is fading. This comes before the crossover.
That is why experienced people watch the histogram shrinking instead of waiting for the crossover. It comes early, and so it is also wrong more often — both go together.
In a sideways market MACD keeps dancing across zero and gives one false signal after another. It is an indicator built on moving averages, so all the weaknesses of moving averages are in it too.
Second: MACD numbers are absolute, so comparing the MACD of two different stocks is pointless. The MACD of an expensive stock will always show bigger numbers.
Don't use MACD as an entry trigger. Use it for this question: in the trend I want to trade, is it accelerating or getting tired right now? It answers that one question reasonably well, and asking for more than that is the cause of most losses.
This article is for educational purposes only — it is not a buy or sell recommendation, makes no claim of guaranteed returns, and is not advice. Rules, rates and mechanics are changed from time to time by the exchanges, SEBI and RBI, so verify every number yourself with your broker or an official source.