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Inventory Turnover Calculator

How many times inventory sells per year — COGS / average inventory.

Best for: Spotting dead stock, right-sizing purchase orders, preparing for inventory financing, or tracking whether growth is tying up cash in stock.

Complete guide
See benchmark ranges Why this result happened View assumptions
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How it's calculated & sources
The Inventory Turnover Calculator uses the standard formula for this calculation. It runs entirely in your browser, so your inputs are never uploaded. Figures are educational estimates, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.
Key assumptions
  • Average inventory is representative of the period

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

How it works

Inventory Turnover = COGS / Average Inventory

Days of Inventory = 365 / Turnover

Example

COGS $500,000 ÷ Avg inventory $80,000 = 6.25 turns/year, ≈ 58 days of inventory on hand.

Frequently asked questions

Is a higher turnover always better?+

Generally yes, but too high may signal understocking and lost sales. Aim for your industry benchmark.

How do I calculate average inventory?+

(Beginning inventory + Ending inventory) ÷ 2 for the period.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Inventory Turnover?
The Inventory Turnover Calculator shows how many times you sell through your average inventory in a year — the core measure of stock efficiency.
Why does Inventory Turnover matter?
It ties up cash and drives turnover - how efficiently stock becomes sales.
How is Inventory Turnover calculated?
It divides the period's cost of goods sold by average inventory (opening + closing ÷ 2). Days-of-inventory is 365 ÷ turnover. Formula: turnover = COGS ÷ average inventory; days inventory = 365 ÷ turnover.
What is a good inventory turnover?
~4-12x per year (industry-dependent)
What are common inventory turnover mistakes?
Using revenue instead of COGS in the numerator (inventory is at cost).
When should you use the Inventory Turnover Calculator?
Spotting dead stock, right-sizing purchase orders, preparing for inventory financing, or tracking whether growth is tying up cash in stock.

What is the Inventory Turnover Calculator?

The Inventory Turnover Calculator shows how many times you sell through your average inventory in a year — the core measure of stock efficiency.

How the Inventory Turnover Calculator works

It divides the period's cost of goods sold by average inventory (opening + closing ÷ 2). Days-of-inventory is 365 ÷ turnover.

turnover = COGS ÷ average inventory; days inventory = 365 ÷ turnover
  1. Enter COGS for the year (not revenue).
  2. Enter opening and closing inventory value at cost.
  3. Read turnover and days-of-inventory; compare within your industry, not across.

Understanding the inputs

What each value means, why it matters, and a typical range — so you can fill in the calculator with confidence.

Inventory Value

The cost value of the stock a business is holding.

Why it matters:
It ties up cash and drives turnover - how efficiently stock becomes sales.
Typical range:
Varies by industry; lower relative to sales is usually more efficient.
How it affects results:
  • Higher: More cash tied up and a risk of unsold, aging stock.
  • Lower: Less cash tied up, but a risk of stockouts.

Common mistake: Valuing inventory at retail price instead of cost.

Cost of Goods Sold (COGS)

The direct costs of producing what you sold - materials and direct labor.

Why it matters:
It is subtracted from revenue to get gross profit, the core of product economics.
Typical range:
Often 40% to 80% of revenue depending on the business.
How it affects results:
  • Higher: Lower gross margin.
  • Lower: Higher gross margin.

Common mistake: Including overheads like rent and admin, which are not direct costs.

Benchmark reference

What counts as poor, average or excellent for this metric.

Inventory Turnover

Average~4-12x/yr

Source: General retail benchmarks · Updated June 2026

Typical values

Inventory Turnover:
~4-12x per year (industry-dependent)

Common interpretation errors

  • Varies hugely by industry
  • Too high can mean stockouts

What impacts results most

  1. 1.
    COGS (High impact)The numerator of turnover.
  2. 2.
    Average inventory (High impact)Less stock for the same sales raises turnover.

Key assumptions

  • Average inventory is representative of the period

Inventory turnover ratio to days of inventory

2×183 daysSlow-moving
4×91 daysHealthy for many sectors
6×61 daysHealthy for many sectors
8×46 daysHealthy for many sectors
12×30 daysVery fast / lean

Common mistakes to avoid

  • Using revenue instead of COGS in the numerator (inventory is at cost).
  • Averaging just two points across a seasonal year — use monthly averages if stock swings.
  • Chasing a 'good' universal number; benchmarks are sector-specific.

Related concepts

How COGS connects to the concepts around it.

Gross Margin:
Revenue minus direct costs, as a percent of revenue.
Revenue:
Total money earned from sales before any costs.
Break-even:
The sales volume where revenue equals total costs.
Markup:
Profit as a percentage of cost rather than price.

Business Economics learning path

A sensible order to learn these concepts.

RevenueCOGSGross MarginNet MarginBreak-even

Reviewed sources & methodology

Methodology: Industry Standard · Last reviewed June 2026.

Keywords: inventory, turnover, cogs.

A ratio explainer for planning — not accounting advice.

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Inventory Turnover Calculator free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Inventory Turnover Calculator?+

Inventory Turnover Calculator uses the standard inventory turnover formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Inventory Turnover Calculator runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Inventory Turnover Calculator on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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How many times inventory sells per year — COGS / average inventory.

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