Beginning Inventory Calculator

Start of Period Inventory Calculator

Input Fields

Ending inventory

EI

$

Inventory remaining at the end of the period

Cost of goods sold (COGS)

COGS

$

Direct costs attributable to the production of goods

Purchases during the period

P

$

Inventory purchases made during the period

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Beginning Inventory

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Beginning Inventory Formula

$$\text{Beginning Inventory} = \text{Ending Inventory} + \text{Cost of Goods Sold} – \text{Purchases}$$

Explanation:
This formula reverses the typical COGS equation to help businesses estimate what their inventory levels were at the start of a period. It’s crucial for inventory valuation and auditing.

Beginning inventory reflects the value of goods available for sale at the start of a financial period. It plays a key role in calculating the cost of goods sold (COGS) and tracking stock levels over time.

Example Variables:

• Ending Inventory: $12,000
• Cost of Goods Sold: $50,000
• Purchases: $30,000
• Beginning Inventory = 12,000 + 50,000 – 30,000 = $32,000

Use Cases:

• Monthly/quarterly financial reporting
• Retail & eCommerce inventory management
• Tax & audit preparation