# Inventory Turnover Calculator

Calculate inventory turnover ratio and days sales in inventory. Measure how efficiently your business sells and replaces stock. Free online calculator.

## What this calculates

Measure how efficiently your business manages inventory with our free turnover calculator. Enter COGS and inventory values to see the turnover ratio, days to sell inventory, and average inventory held.

## Inputs

- **Cost of Goods Sold (COGS)** ($) — min 0 — The total cost of goods sold for the period (usually annual).
- **Beginning Inventory** ($) — min 0 — The inventory value at the start of the period.
- **Ending Inventory** ($) — min 0 — The inventory value at the end of the period.

## Outputs

- **Inventory Turnover Ratio** — How many times inventory is sold and replaced during the period.
- **Days to Sell Inventory (DSI)** — The average number of days it takes to sell through inventory.
- **Average Inventory** — formatted as currency — The average inventory held during the period.

## Details

Inventory turnover ratio measures how many times a company sells and replaces its entire inventory during a period. The formula is: Inventory Turnover = Cost of Goods Sold / Average Inventory, where Average Inventory = (Beginning Inventory + Ending Inventory) / 2. A higher ratio indicates more efficient inventory management and faster sales.

Days Sales in Inventory (DSI) converts the turnover ratio into the average number of days it takes to sell through inventory: DSI = 365 / Turnover Ratio. For example, a turnover ratio of 5.0 means inventory is sold and replaced about every 73 days. A grocery store might have a DSI of 10-20 days, while a furniture store might have 100-200 days.

Both metrics should be compared to industry benchmarks. A very high turnover might seem efficient but could indicate understocking and missed sales. A very low turnover usually indicates overstocking, obsolescence risk, or weak sales. The goal is to balance having enough inventory to meet demand without tying up excess capital in unsold goods.

## Frequently Asked Questions

**Q: What is a good inventory turnover ratio?**

A: It varies significantly by industry. Grocery stores typically have turnover ratios of 14-20 (selling inventory every 18-26 days). Clothing retailers average 4-6 turns per year. Automotive dealers might see 6-8 turns. Compare against industry peers rather than absolute numbers. Consistently improving turnover over time is a positive signal.

**Q: What does a low inventory turnover ratio mean?**

A: A low turnover ratio indicates inventory is sitting on shelves too long, which can mean overstocking, weak demand, poor product mix, or pricing issues. Low turnover ties up working capital, increases storage costs, and raises the risk of obsolescence or spoilage. Businesses should investigate whether to reduce orders, discount slow-moving items, or adjust their product mix.

**Q: Why use COGS instead of revenue for inventory turnover?**

A: COGS is preferred because both inventory and COGS are measured at cost, making the ratio an apples-to-apples comparison. Using revenue would inflate the ratio because revenue includes the markup. Some analysts do use revenue-based turnover for quick comparisons, but cost-based turnover is the standard for financial analysis.

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Source: https://vastcalc.com/calculators/finance/inventory-turnover
Category: Finance
Last updated: 2026-04-21