FIFO Inventory Calculator

What is the FIFO Inventory Method?

The First-In, First-Out (FIFO) method is an inventory accounting valuation technique based on the assumption that the oldest inventory items purchased or produced are sold first. Consequently, the cost of goods sold (COGS) reflects historical purchase prices, while remaining ending inventory is valued at current market acquisition costs.

How FIFO Affects Financial Statements

During inflationary periods when prices are rising, FIFO results in:

• Lower Cost of Goods Sold (COGS): Older, cheaper inventory items are matched against current revenues.
• Higher Gross Profit & Net Income: Because COGS is lower, reported profitability increases.
• Higher Ending Inventory Asset Value: The balance sheet reflects newer, higher-cost inventory items.

FIFO Calculation Formula

To calculate COGS under FIFO across multiple inventory batches $i=1 \dots k$ with quantity $q_i$ and unit cost $c_i$:

$$\text{COGS} = \sum_{i=1}^{k} s_i \times c_i$$

$$\text{Ending Inventory Value} = \text{Total Cost of Goods Available} - \text{COGS}$$

where $s_i$ represents units sold allocated sequentially from batch 1 through batch $k$.

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