Stock Turnover Ratio = 

  Cost of Goods   
 Average Stock 

This ratio establishes relationship b/w the cost of goods 
sold during a given period and the average amount of 
inventory carried during that period.
It indicates whether the stock has been efficiently used or 
not,the purpose being to check up whether only the required 
minimum has been locked up in stocks.
FORMULA:
STR=COGS/Av. stock

The rate of stock turn over in units is calculated by 
taking no. of units sold during the time period divided by 
the average units of inventory on hand for the 
time.                                                       
                                                            
                                                            
   stock turn over ratio=cost of goods sold/average stock

cost of goods sold/avarege stock*100

This ratio establishes relationship b/w the cost of goods 
sold during a given period and the average amount of 
inventory carried during that period.
It indicates whether the stock has been efficiently used or 
not,the purpose being to check up whether only the required 
minimum has been locked up in stocks.
FORMULA:
cost of goods sold /avarage stock*100

Stock turnover ratio is used to know How many times stock 
utilised for particular sales

formula

Cost of goods sold/Average stock

or

Sales /Average stock

stock turnover ratio =

COST OF GOODS SOLD / AVERAGE STOCK*100

COST OF GOODS SOLD = SALES_ GROSS PROFIT
              OR
OPENING STOCK + PURCHASE + DIRECT EXPENSES - CLOSING STOCK

stock turnover ratio =netsales/net working capital

STOCK TURNOVER RATIO = COST OF GOODS SOLD/AVERAGE INVENTORY
COST OF GOODS SOLD= SALES -GROSS PROFIT
AVERAGE INVENTORY = (OP STOCK +CLOSING STOCK) /2

THIS RATIO ESTABLISHES RELATIONSHIP BETWEEN THE COST OF 
GOODS SOLD AND AVERAGE INVENTORY CARRIED OUT.

stock turnover ratio show the relationship between cost of
goods sold and average stock.
formula 
= cost of goods of sold/average stock
average stock= opening stock+closing stock\2

stock turnover ratio = Cost of goods sold/Average stock 
where, Cost of goods sold is Opening stock + Purchases + 
Direct expenses-closing stock 
Average stock is openeing stock + closing stock /2

stock Turnover Ratio = 
  Cost of Goods\Average Stock

Cost Of Stock sold during the year/Opening stock+ stock 
purchased

Stock Turnover Ratio = Cost of Goods Sold/Average Stock
For year 2008 =  7.2067 times
For year 2007 = 6.556 times
Analysis:- Stock turnover ratio shows that every rupee
invested in stock has been used to achieve more sales. A
firm with high ratio can sell even at a low margin.A higher
ratio indicates that the firm is making higher sales and
that it’s storage cost is low.

Stock Turnover Ratio,

Cost of Goods Sold/Average stock

Average stock=Opening stock/Closing stock

Stock turnover ratio or inventory turnover ratio means a   
considerable amout of capital tied up in financing the raw 
material,work in progress and finished goods. It is 
importent to ensure that the level of stocks kept as low as 
possible,consistent with need to fulfil customer's orders 
in time
           stock turnover ratio= cost of goods sold
                                ---------------------
                                   avg inventory

      avg inventory=(opening stock+closing stock)/2

it is ratio of cost of goods sold and average stock

the stock turnover ratio measures the number of times a firm sells its stock within a time period, usually in a period of one year. the ratio therefore indicates the speed at which a firm sells and replenishes all its stock. 
average stock divided by cost if the goods sold X 100