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Simple Moving Average (SMA) Explained. A simple moving average (SMA) is the simplest type of moving average in forex analysis (DUH!). Basically, a simple moving average is calculated by adding up the last âXâ periodâs closing prices and then dividing that number by X.
Yet, you can construct a moving average also on a shorter time-frame, for example by using daily-or minute-data. For example, if you want to make a 10-day moving average, you just add up all the closing prices during the last 10 days and then divide it by 10 (in this case it is a simple moving average). Similarly, we can also use a combination of three averages, e.g. a 5-day, 10-day and 20-day average. 2  In this case, an upward trend is indicated if the 5-day average line is above the 10-day moving average, while the 10-day average is still above the 20-day average.