Watch concentration

COGS calculator

Estimate cost of goods sold for a period from inventory and purchases.

Calculator

Live result

—

Enter values to see results update live.

Next in the loop

Keep going

See what share of spend sits with your top supplier.

Calculate and improve COGS

Period view
Line-level tools show one SKU. COGS shows whether the whole category is drifting.
Invoice-backed purchases
Purchases should reflect what suppliers actually billed you.
Pairs with concentration
High COGS plus one dominant vendor is a risk combo worth watching.

What is COGS?

Beginning inventory plus purchases minus ending inventory for the period.

How often should I run this?

Monthly or quarterly is enough for most SMBs — align with how often you review supplier bills.

Can CostBeacon replace manual COGS?

CostBeacon tracks line-item costs from invoices. Use this for period inventory math; use the app for ongoing price history.

Sources & citations

Formulas follow standard cost-accounting definitions. CostBeacon defaults are documented in product help and technical guides.

Formula reference

COGS = beginning inventory + purchases − ending inventory

CostBeacon

Upload supplier PDFs and get line-item unit costs, price alerts, and margin insights — without spreadsheets.