How To Calculate Purchases Or Inventory Purchases In Accounting


How To Calculate Purchases In AccountingPurchases included both Cash Purchases and Credit Purchases. So, it is the sum of cash purchases and credit purchases. Mathematically, we can show as below:











Purchases = Cash Purchases + Credit Purchases





The purchases is also called Total Purchases that is a wider term which includes both types of purchases.


There is another way to calculate purchases. That is Cost of Sales Formula as shown below:


                        Cost Of Sales = Beginning Inventory + Purchases - Ending Inventory


                        Purchases = Cost of Sales - Beginning Inventory + Ending Inventory


How to Calculate Purchases Without Beginning Inventory


You can calculate purchases without beginning or opening inventory if average inventory is given. We know that Average Inventory Formula is as:


                              Average Inventory = Beginning Inventory + Ending Inventory / 2


Let’s us consider an example in order to understand this question.


Example: If ending Inventory is Rs. 3000 and Average Inventory is Rs. 4000 , Cost of Sales = Rs. 13000, then calculate purchases


We know that Purchases Formula:


                            Purchases = Cost of Sales - Beginning Inventory + Ending Inventory


Purchases = 13000 - (5000 + 3000)


Purchases = Rs. 5000



By applying the above formula of average inventory, the Opening Inventory = 2 X 4000 - 3000 = Rs. 5000


How To Calculate Purchases Without Ending Inventory


Similarly, you can also find out the value of purchases if ending inventory is not given. Let’s us take another example, where opening inventory is Rs. 8000 and average inventory is Rs. 7000, Cost of Sales is Rs. 25000, then find out the value of purchases during the accounting period.


We know that:


Purchases = Cost of Sales - (Beginning Inventory + ending inventory)


Purchases = 25000 - (8000 + 6000)


Purchases = 25000 - 14000 = Rs. 11000




                                   Average Inventory = Opening Inventory + Ending Inventory / 2


(2 X Average Inventory) - Opening Inventory = Ending Inventory


(2 X 7000) - 8000 = Ending Inventory


Ending Inventory = Rs. 6000

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