Business

Inventory Turnover Calculator

Measure how often inventory is sold and replenished over a period using cost of goods sold and average inventory.

Last reviewed: April 30, 2026Free toolMethodology

Inventory Turnover Calculator

These fields start with sample inputs. Keep them or replace them, then run the tool to show a fresh result.

Number fields accept plain values and common formatted input such as 250000, 250,000, or 1,234.56.

Result

Calculating the sample result.

Why it matters

Inventory turnover helps operators balance stock availability against working capital. It is especially useful when comparing categories with different demand profiles.

When to use

  • Reviewing slow-moving inventory
  • Comparing product categories or warehouses
  • Improving cash conversion without raising stockout risk

Inputs & Outputs

Inputs

  • Cost of goods sold should match the same period as average inventory.
  • Average inventory is typically the mean of beginning and ending inventory values for that period.

Outputs

  • Turnover ratio shows how many times inventory cycles through during the period.
  • Days in inventory translates the ratio into an easier planning metric.

Turnover method

Divide cost of goods sold by average inventory value to get turnover. Convert the ratio into days by dividing the period length by turnover.

Inventory turnover = COGS / average inventory

Worked example

1

Quarterly stock review

A category has 480,000 in annualized COGS and 120,000 in average inventory.

Inputs

  • COGS: 480,000
  • Average inventory: 120,000

Steps

  • Turnover = 480,000 / 120,000 = 4.0
  • Days in inventory = 365 / 4 = 91.25

Result

  • Inventory turns 4 times per year, or about every 91 days.

Edge cases & caveats

  • Average inventory can be misleading if stock levels swing sharply during the period.
  • High turnover is not automatically good if it causes frequent stockouts.

Frequently Asked Questions

Should turnover be measured in units or value?

Value-based turnover is more common for financial analysis, but unit turnover can also be useful for operational planning.

What does low turnover suggest?

It can signal weak demand, excess purchasing, slow-moving SKUs, or an intentionally deep buffer stock strategy.

Keep going

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