Introduction: The 'sma' indicator is used in indicator formula construction to narrow the stock pre-screener results to include only those stocks that have a simple moving average stock price restricted to the parameters set for the sma indicator. Calculation: Add up each of the last x-day closing stock prices then divide the sum by x. Example: Below is a chart of Intel (INTC) highlighting days where the 20-day simple moving average stock price was greater than the 50-day simple moving average.