Tool · Valuation Methods

Inventory Valuation Calculator

Compare FIFO, LIFO, and Weighted Average valuation methods to find the best approach for your inventory accounting.

FIFO
Value oldest units first

Method = First In, First Out — earliest purchases are consumed first

LIFO
Value newest units first

Method = Last In, First Out — latest purchases are consumed first

Weighted Average
Total Cost ÷ Total Units × Qty

Method = Blended cost across all batches applied uniformly

Purchase Batches
DateQuantityUnit Cost ($)Line Total
$0.00
$0.00

FIFO (First In, First Out) assumes the oldest inventory is sold first — most common and generally preferred for ecommerce.

LIFO (Last In, First Out) assumes the newest inventory is sold first — often used for tax advantages when costs are rising.

Weighted Average blends all purchase costs into a single average cost — simplest to manage across many batches.

Units to Value

0

Add purchase batches with quantities and costs above, then enter the number of units to value. The calculator will compare all three valuation methods automatically.

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Tool guide · Why use it

What this tool helps you do

  • Compare FIFO, LIFO, and Weighted Average side by side
  • Accurately value ending inventory for financial reporting
  • Optimize tax strategy by choosing the best valuation method
  • Calculate per-unit costs across different methods
  • Support informed accounting decisions with real data
FAQ · 05 entries

Frequently asked questions.

01What is the difference between FIFO and LIFO?

FIFO (First In, First Out) assumes the oldest inventory is sold first, so ending inventory reflects the most recent purchase costs. LIFO (Last In, First Out) assumes the newest inventory is sold first, so ending inventory reflects older costs. In times of rising prices, FIFO results in higher inventory values and lower COGS, while LIFO results in lower inventory values and higher COGS.

02How does Weighted Average costing work?

Weighted Average costing divides the total cost of all units available for sale by the total number of units. This blended per-unit cost is then applied to both COGS and ending inventory, smoothing out price fluctuations across purchase batches.

03Which inventory valuation method should I use?

The best method depends on your business and goals. FIFO is the most common and aligns with natural inventory flow. LIFO can reduce taxable income when prices rise but is not allowed under IFRS. Weighted Average is simplest to maintain and works well when units are interchangeable.

04Can I switch between valuation methods?

Switching methods is possible but regulated. In the US, changing from LIFO requires IRS approval (Form 3115). Businesses should consult an accountant before switching, as it can impact taxes and financial statements significantly.

05How do I calculate cost of goods sold with FIFO?

With FIFO, cost of goods sold is calculated by assigning the cost of the earliest purchased units to the units sold. Start with the oldest batch, use up its quantity, then move to the next batch until the total units sold are accounted for.