The exponential moving average (EMA) is a weighted moving average gives more weight to recent price data than the simple moving average (SMA). It is also known as the exponentially weighted moving average. An online EMA calculator to perform the exponential moving average calculation based on the input of today price, yesterday price and a number of days. The 12 and 26 days EMAs are the short-term averages and 50- and 200-day EMAs are used as signals of long-term trends.