Quick guide
How to use this calculator
- Gather Older layer units, Older layer unit cost, Newer layer units, Newer layer unit cost, and Units sold for the same business scenario before calculating.
- Use one SKU scope, valuation basis, and reporting cut-off; physical counts and accounting quantities may require a separate reconciliation.
- Apply the displayed fifo inventory result to the stated decision only after checking every entered assumption.
Calculation method
Calculation method
FIFO assigns the oldest entered layer to units sold first.
The calculation uses these named inputs: Older layer units, Older layer unit cost, Newer layer units, Newer layer unit cost, and Units sold. No market rate, benchmark, tax rule, or accounting classification is inserted automatically.
Fixed-decimal arithmetic remains exact through display unless a result is explicitly labelled approximate, such as a square-root inventory quantity.
Inventory accounting and stock control
Where the FIFO Inventory Calculator helps
Value cost of goods sold and ending inventory from two entered cost layers using FIFO.
Use the result to reconcile entered stock movements or apply the explicitly named inventory-cost convention.
- Review a stock-count variance
- Reconcile beginning stock, movements, and ending stock
- Compare an entered inventory-cost method across the same transactions
Interpretation check
How to audit the result
Recalculate the scenario when any of these inputs changes: Older layer units, Older layer unit cost, Newer layer units, Newer layer unit cost, and Units sold.
Keep this formula beside the result: FIFO assigns the oldest entered layer to units sold first. Then compare the output with the source records and the calculator-specific assumption below.
- Confirm that all amounts use one currency and reporting period.
- Check that rates, counts, and quantities describe the same population or transaction set.
- Save the entered assumptions with the decision; the result alone is not reproducible evidence.
Worked example
Worked example
100 units at 10 followed by 100 at 12, with 150 sold, gives COGS 1,600.00 and ending inventory 600.00.
FIFO assigns the oldest entered layer to units sold first.
Supported inputs
Precision and limits
Visible input limits
Fixed decimals accept up to 30 digits and 12 decimal places and are capped at an absolute value of 1e12 per input. Rates are capped at 1000%; percentage shares and method-specific domains may be narrower.
International scope
No currency, tax jurisdiction, accounting framework, payroll rule, marketplace fee schedule, financing term, or industry benchmark is selected automatically.
Decision boundary
Use the result to reconcile entered stock movements or apply the explicitly named inventory-cost convention. Results remain arithmetic scenarios, not accounting records, forecasts, valuations, legal interpretations, professional advice, or recommendations.
Calculator-specific assumptions
This simplified two-layer periodic FIFO scenario excludes returns, transfers, write-downs, taxes, and jurisdiction-specific reporting requirements.