How To Calculate Moving Average Stocks. To get the average we divide 105 by 3 = 35. I have 10 years of daily closing prices for the stock:
2 in the interval box enter the interval you want to calculate moving averages based on. For a sma moving average calculated using $m$ days, the lag is roughly $\frac{m}{2}$ days. To calculate the moving average of 5 periods, for march 25 th, we average the price of 5 days (mar 19 th to 25 th ).