Moving Average Sometimes called a rolling average, the moving average is used to calculate an average for a specific period: for example, to calculate the average number of new hires each month for the past 12 months. As the number for the most recent month is added, the oldest number is dropped.Weighted Average A weighted average is used to compensate for data that may be out of date; the more current data is multiplied by a predetermined number to better reflect the current situation.Weighted Moving Average The weighted moving average calculation assigns more weight to current data with the use of a predetermined number and drops the oldest data when new data is added.