Average of last 30

I am trying to calculate inventory turnover ratio. This involves dividing the cost of goods sold for the last 30 days by the average daily inventory of the last 30 days. I have the formula for daily inventory, but what would be the formula to calculate the daily inventory for each of the last 30 days and then get an average?

Sum up the Cost of Goods Sold for the 30 days (= COGS), sum up your daily inventory value for each of the 30 days (= Inv) and calculate your turnover as COGS / Inv / 30.
HTH,
Carl

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