Technical & Chart AnalysisEMAExponentially Weighted Moving Average
Exponential Moving Average (EMA)
A moving average that weights recent prices more heavily, so it reacts faster to new information than an SMA.
What Exponential Moving Average (EMA) means
An exponential moving average weights recent prices more heavily than older ones, with the weight decaying geometrically into the past. Each new value is calculated as the current close multiplied by a smoothing factor, plus the previous EMA multiplied by one minus that factor. The smoothing factor is conventionally 2 divided by the period length plus one, so a 20-period EMA uses roughly 0.0952. Because every past price retains a small residual weight, the EMA technically never fully discards old data, but the influence of distant periods becomes negligible.
Traders choose the EMA when responsiveness matters more than smoothness, which is why short-term and intraday systems favour it and why the MACD is built from 12 and 26 period EMAs. It is used identically to other averages, as a trend filter, a dynamic support level and a crossover trigger. The trade-off is symmetrical to its advantage: reacting faster to genuine turns also means reacting faster to noise, so an EMA produces more false signals than an SMA of the same length in choppy conditions.
Worked example
With a prior 20-period EMA of 1.0850 and a new EUR/USD close at 1.0900, the smoothing factor of 0.0952 gives a new EMA of about 1.0855, whereas the equivalent SMA would move less.
Related terms
- Simple Moving Average (SMA)The unweighted mean of the last N closing prices, recalculated each period as the window rolls forward.
- Moving AverageA line that averages price over a rolling lookback window in order to smooth noise and reveal underlying direction.
- MACDA momentum indicator built from the difference between the 12 and 26 period EMAs, with a 9-period signal line.
- TrendA sustained directional bias in price, conventionally defined by a sequence of higher highs and higher lows, or the reverse.
Frequently asked questions
What does Exponential Moving Average (EMA) mean in forex trading?
A moving average that weights recent prices more heavily, so it reacts faster to new information than an SMA.
How does Exponential Moving Average (EMA) work in practice?
Traders choose the EMA when responsiveness matters more than smoothness, which is why short-term and intraday systems favour it and why the MACD is built from 12 and 26 period EMAs. It is used identically to other averages, as a trend filter, a dynamic support level and a crossover trigger. The trade-off is symmetrical to its advantage: reacting faster to genuine turns also means reacting faster to noise, so an EMA produces more false signals than an SMA of the same length in choppy conditions.
What is an example of Exponential Moving Average (EMA)?
With a prior 20-period EMA of 1.0850 and a new EUR/USD close at 1.0900, the smoothing factor of 0.0952 gives a new EMA of about 1.0855, whereas the equivalent SMA would move less.
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