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2 tools liveIs my inventory moving efficiently?
Inventory Turnover Calculator
Calculate your inventory turnover ratio (COGS ÷ Average Inventory) and days inventory outstanding (DIO). Includes an industry benchmark table to see how your result compares across 8 sectors.
Open calculator →Do I need to reorder right now?
Days of Supply Calculator
Calculate how many days your current stock will last at your current demand rate. Enter lead time to instantly see whether you have enough coverage before the next shipment arrives.
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Inventory Guides
Understand the theory and benchmarks before you use the calculators.
Also: Supply Chain Calculators
EOQ, Reorder Point, Safety Stock, and Lead Time — the replenishment side of inventory management.
Frequently Asked Questions
What is the difference between inventory calculators and supply chain calculators?
Supply chain calculators (EOQ, Reorder Point, Safety Stock, Lead Time) answer replenishment questions — how much to order, when to order, and how much buffer to hold. Inventory calculators measure how efficiently existing stock is being used — metrics like inventory turnover and days of supply show whether stock is moving at the right pace and highlight where working capital is being wasted.
What is a good inventory turnover ratio?
It depends entirely on your industry. Grocery and FMCG businesses typically see 12–14×, apparel 4–6×, manufacturing 4–7×, and furniture 2–4×. There is no single universal benchmark — compare your result to your sector's average. Use the Inventory Turnover Calculator to get your ratio alongside an industry benchmark table.
Are these calculators free to use?
Yes. All calculators on this site are completely free — no account, subscription, or sign-up required. They run entirely in your browser using standard industry formulas.
How does inventory turnover connect to supply chain metrics?
Inventory turnover and supply chain efficiency are directly linked. Reducing lead time lets you hold less safety stock, which reduces average inventory and improves turnover. Using the right EOQ prevents over-ordering, which also keeps average inventory lean. The two calculator categories complement each other.