What Is a Moving Average? SMA vs. EMA Explained for Beginners
A moving average is the simplest indicator: a line showing the average price over the last N candles. Here's how it helps you see the trend and why you shouldn't trade every crossover.
What it is
A moving average (MA) is the average closing price over the last N candles. With each new candle, the oldest one drops out of the calculation, and the line "moves" along with the price, smoothing out the noise.
| Type | How it's calculated | Key feature |
|---|---|---|
| SMA (simple) | A plain average | Smooth but slow |
| EMA (exponential) | More weight on the latest candles | Reacts faster |
Popular periods
- 20: the short-term trend.
- 50: the medium-term trend.
- 200 on the daily chart: the long-term trend, and a lot of people watch it.
How it's used
- Trend direction. Price above a rising MA means an uptrend; price below a falling MA means a downtrend.
- Dynamic support. In a trend, the price often pulls back to the MA and bounces off it.
- Crossovers. A fast MA crossing above a slow one is a sign of a trend change. But the signal lags, and in a sideways market it produces a lot of false entries.
A moving average isn't a magic line; it's a quick way to see the trend. How to identify the trend on a chart is covered in the lesson technical analysis: trends and levels and in the article how to read a chart. Stop-losses are placed based on the chart structure, not "on the line."
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- An MA is the average price over N candles, and it smooths out noise.
- It shows the trend, but with a lag.
- In a sideways market, crossovers give false signals.
Frequently Asked Questions
Which is better: SMA or EMA?
For a beginner, there's no fundamental difference. EMA reacts faster but gives more false signals; SMA is slower but steadier.
What is a "golden cross"?
When the 50-day moving average crosses above the 200-day moving average. It's considered a sign of long-term growth, but it triggers late and doesn't always work.
Can I trade using only moving averages?
You can build a simple system, but in a sideways market it will produce a series of losses. A stop-loss and a trend filter are a must.
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