Moving averages: SMA or EMA, which periods and how to use them
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The moving average is the most widely used indicator in the world. SMA vs EMA, classic periods, crossovers and the uses that actually work.
- The SMA weights every price equally; the EMA favours the most recent ones.
- Reference periods: 20 (short term), 50 (medium term), 200 (long term).
- A moving average describes the trend; it does not predict it.
- Crossovers work in trends and produce false signals in ranges.
A moving average smooths prices to reveal the trend beneath the noise. It is the most widespread indicator: it is on every platform, and institutions watch some of them, which gives them real influence. Understood well, it is an excellent context tool; misused, an endless source of false signals.
SMA: the simple average
An n-period SMA (Simple Moving Average) is the arithmetic mean of the last n closing prices:
Every price carries the same weight. As a result, when a very old price drops out of the window, the average can move even though nothing is happening today. The SMA is slow but stable.
EMA: the exponential average
The EMA (Exponential Moving Average) gives more weight to recent prices:
For a 20 EMA, k ≈ 0.095: the latest close counts for nearly 10%. The EMA reacts faster to changes in direction, at the cost of more false signals. Short-term traders prefer it; investors tend to use the SMA.
Classic periods
| Period | Typical use |
|---|---|
| 9 – 21 | Short-term trend, intraday trading |
| 50 | Intermediate trend, closely watched on the daily chart |
| 100 | Medium-term support/resistance |
| 200 | The arbiter of the long-term trend (daily) |
There is no “magic” period. The daily 200 SMA works mainly because everyone watches it: many fund managers use it to define bull or bear markets.
Four uses that work
1. Trend filter
Only buy when price is above its long average (and that average is rising); only short when it is below. This simple filter avoids many counter-trend trades. It ties in with reading market regimes.
2. Dynamic support
In a strong trend, price regularly comes back to test an average (often the 20 or 50 EMA) before moving on. These pullbacks offer entries with a logical stop below the average.
3. Crossovers
A short average crossing above a long one signals a trend change. The most famous is the golden cross (50 SMA crossing above the 200 SMA) and its opposite, the death cross. These signals always arrive late: they confirm a move already under way.
4. Measuring extension
Price far from its average is “stretched”: reversions toward the average are then common. Useful to avoid buying at the worst moment, after a vertical rally.
The range trap: in a trendless market, price crosses the averages both ways and crossovers pile up, each followed by a small loss. If the averages are flat and intertwined, they tell you only one thing: there is no trend.
Lag versus responsiveness: the trade-off
Every moving average lags by construction. The shorter it is, the less it lags but the noisier it gets. No setting removes this trade-off; that is why an average should serve as context (which way should I trade?) rather than as a sole trigger.
In practice
The candlestick mode of the Bullmarket terminal adds an EMA in one click. A simple routine: check where price sits relative to the EMA on a higher timeframe, then look for entries in that direction at key levels. Test the rule in the simulator and compare your long and short results in the statistics.
Educational content only — not investment advice. Trading involves the risk of losing capital.