Exponential Moving Average vs. Simple Moving Average: What's the Difference? (2024)

Exponential Moving Average vs. Simple Moving Average: An Overview

Exponential Moving Average (EMA) and Simple Moving Average (SMA) each measure trends commonly used by technical traders to smooth out price fluctuations.

The primary difference between an EMA and an SMAis the sensitivity each one shows to changes in the data used in its calculation. The exponential moving average gives a higher weighting to recent prices,whilethe simple moving average assigns an equal weighting to all values.

Key Takeaways

  • The exponential moving average gives a higher weighting to recent prices.
  • The simple moving average assigns an equal weight to all values.
  • As with all technical indicators, a trader cannot use one type of average to guarantee success.

Simple Moving Average

The Simple Moving Average (SMA) is the most common type of average used by technical analysts andis calculated by dividing the sum of a set of prices by the total number of prices found in the series. A 20-period moving average can be calculated by adding the following twenty prices together anddividing the result by twenty:

SMA = $311/20 = $15.55

DayPrice
1$10
2$12
3$10
4$14
5$16
6$16
7$15
8$17
9$17
10$16
11$18
12$15
13$14
14$16
15$15
16$18
17$18
18$19
19$17
20$18

Exponential Moving Average

Since the exponential moving average (EMA) places a higher weight on recent data than on older data, they are more reactive to the latest price changes than SMAs. The results from EMAs are more timely and usually the preferred average among traders. Traders calculate the multiplier for smoothing or weighting the EMA using:

The 20-day SMA was the sum of the closing prices for the past 20 trading days, divided by 20. For a 20-day EMA, the multiplier would be [2/(20+1)]= 0.0952, with the most commonly used smoothing factor as 2. To calculate the current EMA:

  • EMA = Closing price x multiplier + EMA (previous day) x (1-multiplier)

The EMA gives a higher weight to recent prices, while the SMA assigns equal weight to all values. The weighting given to the most recent price is greater for a shorter-period EMA than for a longer-period EMA. For the 20-period example, 9.52% is the weight, but 18.18% would be the multiplier applied to the most recent price data for a 10-period EMA.

Charting Averages

Exponential Moving Average vs. Simple Moving Average: What's the Difference? (2)

Which Average Is Useful for Long Term Investments?

Traders with a longer-term perspective consider the average they use because the values can vary by a few dollars, which is enough price difference to ultimately prove influential on realized returns,especially when trading large quantities of stock.

What Is a Limitation of the Simple Moving Average?

Traders commonly agree that new data better reflectsthe current trend of a stock. The SMA may rely too heavily on outdated data since it gives the same weight to yesterday's price as the price of one year ago.

What Is the Common Period Used for EMA Calculations?

The longer-day EMAs of 50 and 200 days tend to be used by long-term investors, while short-term investors tend to use 8- and 20-day EMAs.

The Bottom Line

Traders use many technical indicators to evaluate investment opportunities and trends. The simple moving average (SMA) is used to see price trends and assigns an equal weight to all values. The exponential moving average (EMA) gives a higher weighting to recent prices.

Exponential Moving Average vs. Simple Moving Average: What's the Difference? (2024)

FAQs

Exponential Moving Average vs. Simple Moving Average: What's the Difference? ›

Description. Exponential Moving Average (EMA) is similar to Simple Moving Average (SMA), measuring trend direction over a period of time. However, whereas SMA simply calculates an average of price data, EMA applies more weight to data that is more current.

What is the difference between exponential moving average and simple moving average? ›

Traders use many technical indicators to evaluate investment opportunities and trends. The simple moving average (SMA) is used to see price trends and assigns an equal weight to all values. The exponential moving average (EMA) gives a higher weighting to recent prices.

Which one is better, SMA or EMA? ›

With moving averages in general, the longer the time period, the slower it is to react to price movement. But everything else being equal, an EMA will track price more closely than an SMA. Because of this, the EMA is typically considered more appropriate in short-term trading.

Why is exponential moving average better? ›

EMA provides higher weights to recent prices, while on the other hand, SMA gives equal weights to all values. Also, EMA is used for shorter time periods and fast-moving markets and SMA is used when a trader is holding a certain position for a long period of time.

What is the difference between moving average and simple average? ›

An average is a static mean in time of an unchanged dataset. A moving average is a dynamic mean in a time series. It changes with the addition of new data.

Which moving average is best for swing trading? ›

20 / 21 period: The 21 moving average is my preferred choice when it comes to short-term swing trading.

Is EMA the same as moving average? ›

Description. Exponential Moving Average (EMA) is similar to Simple Moving Average (SMA), measuring trend direction over a period of time. However, whereas SMA simply calculates an average of price data, EMA applies more weight to data that is more current.

Which moving average is most important? ›

The 200-day moving average is considered especially significant in stock trading. As long as the 50-day moving average of a stock price remains above the 200-day moving average, the stock is generally thought to be in a bullish trend. A crossover to the downside of the 200-day moving average is interpreted as bearish.

What is the 9 and 15 EMA strategy? ›

The 9-period and 15-period EMAs crossover strategy involves the crossover between these two moving averages. For example, when the 9 EMA crosses above the 15 EMA, this implies a bullish trend. Place a buy trade when you find a candlestick pattern that supports your bias, such as a bullish engulfing candlestick.

What is the best length for exponential moving average? ›

The 12- and 26-day exponential moving averages (EMAs) are often the most quoted and analyzed short-term averages. The 12- and 26-day are used to create indicators like the moving average convergence divergence (MACD) and the percentage price oscillator (PPO).

What is the disadvantage of simple moving average? ›

The SMA's weakness is that it is slower to respond to rapid price changes that often occur at market reversal points. The SMA is often favored by traders or analysts operating on longer time frames, such as daily or weekly charts.

What does the simple moving average tell you? ›

A simple moving average (SMA) calculates the average of a selected range of prices, usually closing prices, by the number of periods in that range.

What is the best setting for a simple moving average? ›

There is no perfect set of moving averages. The 5, 8, and 13-bar simple moving averages do offer relatively strong inputs for day traders seeking an edge in trading the market from both the long and short sides.

Are DMA and SMA the same? ›

You may be familiar with indicators like the simple moving average (SMA) and the exponential moving average (EMA). However, did you know that there's a different type of price action smoothening indicator that belongs to the same family of moving averages? This is the displaced moving average (DMA).

What is the difference between SMA 200 and EMA 200? ›

SMA and EMA are calculated differently. The calculation makes the EMA quicker to react to price changes and the SMA reacts slower. That is the main difference between the two. One is not necessarily better than another.

What is the difference between EMA and DMA? ›

DMA involves shifting the moving average line left or right on the chart, projecting past trends onto different points in time. EMA gives more weight to recent price data, resulting in greater responsiveness to current market conditions.

What is the difference between RMA and EMA? ›

Because EMA has a higher alpha value than RMA, the EMA gives more weight to the last price. In fact, the weight EMA uses can be almost double of what RMA uses (see table above). As a result, the EMA responds faster to changes in price. Because its current value uses more recent data than the RMA does.

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