OnSumo Tools

Inventory Turnover Calculator

This calculator finds your inventory turnover ratio and days of inventory on hand, then shows what a higher turnover rate would mean for your cash flow and annual carrying costs. Enter your annual cost of goods sold, average inventory value, holding cost percentage, and industry to benchmark your turnover against industry norms and quantify the cash freed by reaching your target rate.

100% client-side. Inventory and COGS figures never leave this browser.

Turnover, days on hand, holding cost, and cash you might free by hitting a higher target turnover rate.

Inventory turnover

4.0x| 91 days on hand

More than 20% below typical 6-12x

Industry guide: E-commerce 6-12x (benchmarks vary by sub-category).

Turnover ratio

4.00x

Days on hand

91.3 days

Annual holding cost

$15,000

Holding cost per day

$41.10

Cash flow impact (what-if)

Reaching 9x turnover frees about $33,333 in cash and saves about $8,333/year in holding costs.

Cash freed (one-time)

$33,333.33

Annual holding savings

$8,333.33

Inventory at target

$26,666.67

Current vs target inventory (cash tied up)

Total inventory cost sold in the period.

(Beginning + ending inventory) / 2.

Storage, insurance, obsolescence, financing; often 20-30%.

How this tool works

Inventory turnover measures how many times a business sells through its average inventory balance in a period. Formula: Inventory Turnover = Cost of Goods Sold / Average Inventory Value. Average inventory is (Beginning Inventory + Ending Inventory) / 2 for the period. Days on Hand converts turnover to a time metric: Days on Hand = 365 / Turnover Ratio. Holding cost estimates the annual expense of carrying inventory: Holding Cost = Average Inventory x Carrying Cost Percentage. Carrying cost covers storage, insurance, capital opportunity cost, obsolescence risk, and shrinkage, typically 20-30% of inventory value in most industries. The what-if section models a higher target turnover: Target Average Inventory = COGS / Target Turnover, and Cash Released = Current Average Inventory - Target Average Inventory. Key assumption: COGS, not revenue, is the correct numerator; using revenue overstates the ratio by the gross margin percentage and makes comparisons across companies with different margin profiles misleading. Edge case: seasonal businesses have inherently asymmetric inventory levels throughout the year. Using beginning-plus-ending divided by two misrepresents average inventory when seasonal peaks are large -- a 12-month average of monthly closing inventory snapshots gives a more accurate picture of operational efficiency.

Worked example

COGS: $240,000/year. Average inventory: $60,000. Holding cost: 25%. Industry: E-commerce. Inventory turnover: $240,000 / $60,000 = 4.0x. Days on hand: 365 / 4.0 = 91 days. E-commerce benchmark: 6-12x. Current 4.0x is below the low end. If you improve to 6x: target inventory = $240,000 / 6 = $40,000. Inventory reduction: $20,000. Cash freed: $20,000 (one-time working capital release). Holding cost savings: $20,000 x 25% = $5,000/year.

Frequently asked questions

  • What is inventory turnover?

    The number of times per year you sell and replace your entire inventory stock. A turnover of 4x means your average inventory is sold and restocked four times per year. Higher turnover means less capital tied up in stock and lower carrying costs, but also means you must order more frequently.

  • What is a good inventory turnover ratio?

    It depends heavily on your industry. Grocery stores typically run 12-20x because products have short shelf lives and high demand. E-commerce generally targets 6-12x. Apparel and electronics run 4-10x. Auto parts run 4-8x. Compare to your specific sub-category rather than a single universal benchmark.

  • What is the holding cost of inventory?

    The total annual cost of keeping stock in your warehouse: storage rent, insurance, shrinkage, obsolescence, financing costs, and staff time. Industry estimates typically range from 20-30% of average inventory value per year. A product worth $100 in inventory costs $20-$30 per year to hold.

  • What is days of inventory on hand?

    The average number of days your current inventory level would last at your normal sales pace. At 4x turnover, you have about 91 days of stock on hand. At 12x turnover, you have about 30 days. Lower days on hand means faster cash conversion but also less buffer against supply disruptions.

  • Does higher turnover always mean better performance?

    Not necessarily. Turnover that is too high can lead to stockouts and lost sales if your reorder system cannot keep up with demand. The goal is the optimal turnover for your supply chain lead times and customer service targets, not simply the highest number possible.

  • How is cash freed calculated?

    When you improve turnover from 4x to 6x on $240,000 in COGS, your average inventory falls from $60,000 to $40,000. That $20,000 difference is cash that was sitting in stock and is now available for other uses. It is a one-time working capital release, not recurring income. Add a buffer of 10 to 15% above the calculated figure to account for measurement variation and material waste.

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