Inventory Turnover Ratio: Formula, Manufacturing Example and Limits

Inventory turnover looks simple, but it becomes dangerous when a factory mixes raw material, WIP and finished goods without context. A high ratio can mean efficient flow, but it can also mean stockouts. A low ratio can mean slow-moving stock, but it can also mean strategic material coverage.

Optiwise helps by keeping inventory records connected to purchase, production and sales flows. That lets you read turnover with the operational reason behind the number.

Direct answer

Inventory turnover is COGS divided by average inventory value, but manufacturers must keep the period, stock type and valuation method consistent or the ratio misleads.

Factory example

A manufacturer sees finished-goods turnover improving while raw-material turnover is falling. The combined ratio looks acceptable, but the action is different: sales is dispatching faster, while purchase has bought too much imported material. Reading both groups separately prevents the team from celebrating one number while cash is locked in slow raw material.

Implementation path in Optiwise

1. Separate raw material, WIP and finished goods.
2. Use the same period and valuation basis for COGS and average inventory.
3. Convert the ratio into slow-moving, shortage or cash-lock actions.

Worksheet for your factory

Use this as the working checklist before you change software settings, write SOPs or ask the team to follow a new report.

Record	What to capture	Why it matters
COGS for period	₹48,00,000	Use the same period as average inventory
Opening inventory value	₹10,00,000	Include the stock category being measured
Closing inventory value	₹14,00,000	Use the same valuation basis
Average inventory	₹12,00,000	Opening plus closing divided by two
Turnover ratio	4.0	COGS divided by average inventory
Days of inventory	91 days	365 divided by turnover

How Optiwise supports this workflow

• Separate raw material, WIP and finished-goods stock before reading turnover.
• Link purchase receipts, production consumption and dispatch to the same inventory record.
• Use dashboards to spot slow-moving items, shortages and blocked stock rather than reacting to one ratio alone.
• Use AI queries to ask which items are increasing stock value without matching consumption or sales movement.

Explore the connected Optiwise workflows for production, inventory, purchasing, quality, IoT, and AI agents.

Checks before you use the number for decisions

• Confirm the owner of the record and the person who reviews exceptions.
• Write the unit of measure, time period and source system beside every number.
• Mark missing, stale or manually corrected data instead of hiding it inside the final score.
• Keep approval evidence for changes that affect stock, production, quality or customer commitments.

Reference source

For general manufacturing ERP and MRP context, compare this workflow with Deskera MRP resources, then adapt the records to your own factory process.

FAQs

Is higher inventory turnover always better?

No. Higher turnover is useful only if production and dispatch still run without shortages. Critical imported parts, seasonal demand and MOQ purchases can justify lower turnover.

Should raw material and finished goods be measured together?

Use a combined view for finance, but separate views for action. Raw material turnover points to purchase and planning decisions; finished-goods turnover points to demand, dispatch and sales decisions.