Moving Average Explained
A moving average smooths price into a single line that follows the trend, filtering noise so direction and momentum are easier to read.
SMA versus EMA
A simple moving average (SMA) is the mean of the last N closes, weighting every bar equally. An exponential moving average (EMA) weights recent prices more heavily, so it reacts faster to new information. Common lengths are 20, 50, 100 and 200.
The slope tells you the trend: rising average = uptrend, falling = downtrend, flat = range. Price above a rising average is a healthy uptrend; repeated closes back below it warn of weakening.
Crossovers and dynamic levels
A faster average crossing above a slower one (e.g. 50 over 200, the 'golden cross') is a classic bullish signal; the reverse is a 'death cross'. Crossovers lag, so they confirm trend rather than call tops and bottoms.
Moving averages also act as dynamic support and resistance — in a strong trend price often pulls back to the 20 or 50 EMA and continues. Combine with market structure rather than trading crossovers alone.
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Play Chart Bound free → Try today's Call the Candle →Frequently asked questions
What is the difference between SMA and EMA?
An SMA weights all bars in the window equally; an EMA weights recent bars more, so it reacts faster to price changes but can be noisier.
What are the most common moving average periods?
20, 50, 100 and 200 are the most watched. The 50 and 200 are widely followed for the golden cross and death cross signals.
Do moving averages work as support and resistance?
Yes. In a trending market price often bounces off a rising 20 or 50 EMA, so traders use them as dynamic support in uptrends and resistance in downtrends.