FIFO Calculator for Inventory

Properly valuing your inventory is essential for calculating accurate profit margins and filing correct tax returns. Because businesses often buy the same products at different prices throughout the year (due to inflation or supplier changes), accountants must use specific methods to track the flow of costs.

Our free FIFO (First-In, First-Out) Calculator helps business owners and accountants determine their Cost of Goods Sold (COGS) and the value of their remaining inventory. Under the FIFO method, it is assumed that the oldest inventory items—the ones bought first—are the ones sold first.

How the FIFO Method Works

The First-In, First-Out (FIFO) method mirrors the physical flow of goods in most businesses. Think of a grocery store stocking milk: the manager places the oldest milk at the front of the fridge to ensure it sells before it spoils. In accounting, FIFO applies this same logic to cost tracking, regardless of whether the goods are actually perishable.

Under FIFO:

• Cost of Goods Sold (COGS): Calculated using the cost of your oldest inventory batches.
• Ending Inventory: Calculated using the cost of your newest, most recently purchased inventory batches.

Step-by-Step FIFO Example Calculation

Imagine you run a retail store selling wireless headphones. During January, you make two separate inventory purchases, and then make a sale to a customer.

• Batch 1 (Jan 1st): You buy 100 units at $50 each.
• Batch 2 (Jan 15th): You buy 100 units at $60 each (supplier raised prices).
• The Sale (Jan 31st): You sell 120 units to customers.

How do we calculate the COGS for those 120 units using FIFO?

Now, what is the value of your Ending Inventory? You originally bought 200 units and sold 120, leaving 80 units in stock. Because the oldest units were sold first, those 80 units must come entirely from the newer Batch 2.

Ending Inventory = 80 units × $60 = $4,800

FIFO vs. LIFO: Which is better?

The opposite of FIFO is LIFO (Last-In, First-Out), where the newest inventory costs are recognized first. During periods of inflation (when prices are rising), the method you choose severely impacts your financial statements:

• With FIFO: COGS is lower (because older, cheaper inventory is used). This results in higher reported profits and a higher ending inventory value. Higher profits look great to investors, but they also result in a higher income tax bill.
• With LIFO: COGS is higher (because newer, more expensive inventory is used). This results in lower reported profits, which can be highly beneficial for reducing your immediate corporate tax burden.

Frequently Asked Questions (FAQ)

Do I have to physically sell my oldest items to use FIFO?

No. FIFO is strictly a cost flow assumption used for accounting and tax purposes. Even if a customer happens to grab the newest box of headphones off the shelf, your accounting software will still assign the cost of the oldest box to that sale.

Is FIFO allowed by GAAP and IFRS?

Yes. FIFO is widely accepted and is the standard under both Generally Accepted Accounting Principles (GAAP) in the United States and the International Financial Reporting Standards (IFRS) globally.

Is LIFO illegal in some countries?

Yes. While LIFO is permitted in the United States under GAAP (if strictly adhered to for both tax and financial reporting), it is banned under the IFRS framework. Therefore, multinational companies almost exclusively use FIFO or the Weighted Average Cost method to remain compliant across borders.