CalculatorMasters

Inventory Turnover Calculator

Calculate inventory turnover, average inventory, days in inventory, and related stock efficiency metrics from your cost of goods sold and inventory values.

Your Details

Overview

This inventory turnover calculator helps you measure how efficiently stock is being sold and replaced over a chosen period. Enter your cost of goods sold, beginning inventory, ending inventory, and the number of days in the period to estimate turnover and average days in inventory.

How it works

The calculator first finds average inventory by adding beginning and ending inventory and dividing by two. It then divides cost of goods sold by average inventory to calculate inventory turnover. Days in inventory is estimated by dividing the number of days in the period by the turnover rate. Higher turnover usually means stock moves faster, while higher days in inventory suggests stock is held for longer.

How to use this calculator

  1. 1Enter the cost of goods sold for the period you want to review.
  2. 2Add your beginning inventory value at the start of that period.
  3. 3Enter your ending inventory value at the end of the period.
  4. 4Input the number of days covered by the figures.
  5. 5Review the turnover rate, average inventory, and days in inventory.

Example Calculation

Cost of Goods Sold

$250,000

Beginning Inventory

$40,000

Ending Inventory

$60,000

Period Length

365

Inventory Turnover

5.00 times

With cost of goods sold of 250000 and average inventory of 50000, the inventory turnover is 5.00 times and inventory stays on hand for about 73.0 days.

Frequently asked questions

What does inventory turnover measure?

Inventory turnover measures how many times average inventory is sold and replaced during a period.

What is a good inventory turnover ratio?

A good ratio depends on the industry, product type, pricing, and demand patterns. Faster-moving businesses often have higher turnover than businesses with slower or seasonal stock.

Why use average inventory instead of ending inventory only?

Average inventory gives a more balanced view of stock held during the period and reduces distortion from a single point-in-time figure.

What is days in inventory?

Days in inventory estimates the average number of days items remain in stock before they are sold.

Can I use this calculator for monthly or quarterly periods?

Yes. Use cost of goods sold and inventory figures from the same period and enter the correct number of days for that period.

Does a higher inventory turnover always mean better performance?

Not always. Very high turnover can sometimes indicate stock shortages, while very low turnover may point to overstocking or weak sales. It is best reviewed with margins, service levels, and demand trends.

Explore Related Calculators

Stock Reorder Point CalculatorCalculate the inventory level at which you should place a new order based on demand, lead time and safety stock.Calculate →Safety Stock CalculatorEstimate how much safety stock you may need based on demand, lead time, and service level assumptions.Calculate →Inventory Holding Cost CalculatorEstimate the annual cost of holding inventory based on average stock value and key carrying cost percentages.Calculate →Economic Order Quantity CalculatorCalculate the optimal order quantity that helps balance ordering costs and holding costs for inventory planning.Calculate →

Assumptions and warnings

Assumptions

  • Beginning and ending inventory are valued on a consistent basis.
  • Cost of goods sold and inventory values relate to the same period.
  • Average inventory is calculated using the simple average of beginning and ending inventory.
  • Results are estimates and should be reviewed alongside other business metrics and seasonal factors.

Warnings

  • This calculator provides an estimate only and is not accounting or financial advice.
  • Unusual seasonality, stock write-downs, or valuation changes can affect the usefulness of the result.