Turnover days is how many times an average stock is being converted into sales. Fewer turnover days means that you are selling your food quickly and often indicate less waste and lower food cost.
Calculation:
Step 1.
Opening inventory + Closing inventory / 2 = Average inventory
Opening inv. + Purchase – Closing inventory = Inventory used
Step 2.
Average inventory / Inventory used = Turnover ratio
Step 3.
Days in the month / Turnover ratio = Turnover days