6 Inventory Turnover Calculators and CMP’s Trapped-Cash Estimate

An inventory turnover calculator divides cost of goods sold by average inventory to show how many times stock cycles in a period. This comparison covers six ratio calculators and CMP’s trapped-cash questionnaire, with their inputs, outputs, and limits. Cash Margin Partners is included as a directional questionnaire-based trapped-cash estimate; the other six tools calculate inventory-turnover ratios.

Disclosure: Cash Margin Partners publishes this site and ranks itself first. Our entry also states plainly that we don't offer an instant ratio field, which every other tool here does.

Six Ratio Calculators and a Trapped-Cash Estimate at a Glance

How We Tested These Calculators

We opened every calculator page live in September 2026 and recorded what it asks for, what it returns, whether it gates the result, and whether any benchmark figure carries a source. Four widely linked calculators turned out not to exist, and they're named below rather than ranked.

Four criteria, in weighted order:

• Does it return more than the bare ratio? Days in inventory is the number that tells an owner something they can act on.
• Is the result instant and ungated? A calculator behind a demo form is a lead capture wearing a calculator's clothes.
• Is the formula shown? A visible formula lets an owner rebuild it in a spreadsheet and stop returning to the page.
• Are benchmarks sourced? This is where nearly every calculator in this category fails.

All seven verified working September 13, 2026. The four broken ones were verified broken on the same day.

Four Inventory Turnover Calculators That No Longer Exist

Several heavily linked calculator URLs return 404s. If a roundup sent you to one of these, it was written from memory.

Shopify has no inventory turnover calculator. The shopify.com/tools index lists a business loan calculator and a profit margin calculator, and nothing else that calculates. Shopify covers the topic in an editorial article instead.

Katana's calculator URL returns a 404, and katanamrp.com has no calculators hub at all. Its turnover content is a static article with worked examples.

GIGACalculator's inventory turnover page returns a 404, with no working equivalent found on the site.

The Business Development Bank of Canada's benchmarking tool is down. Its page currently reads "We are updating this tool," and offers manual instructions instead. It was the only bank-published turnover tool found.

Key insight

Not one free inventory turnover calculator verified in September 2026 publishes sourced benchmark data. MiniWebtool shows an eight-sector table with no citation, Zoho Inventory exposes an industry selector with no numbers behind it, and Cin7, Katana, inFlow, and NetSuite all publish ideal-ratio ranges in articles with no source attached to any of them.

1. Cash Margin Partners: A Directional Trapped-Cash Calculator

Cash Margin Partners publishes this comparison. Its public calculator is a five-step interactive questionnaire about the business and inventory. It produces a directional trapped-cash estimate rather than a COGS-divided-by-average-inventory ratio.

The free five-step calculator provides a directional trapped-cash estimate from questionnaire answers. A separate free workspace supports SKU-level analysis after a supported store connection or compatible item-level upload.

Inputs and outputs

The questionnaire asks about the business, inventory, and tools. It does not require a store connection or spreadsheet upload. Contact or account details are requested to reveal the full result; this is not an anonymous, ungated ratio calculator.

Pricing and limitations

The calculator and CMP workspace are free. For a standard inventory-turnover ratio from COGS and average inventory, use a ratio calculator. SKU classifications and supported forecasts belong to the separate workspace and depend on usable source data.

2. Omni Calculator: Best Free Instant Calculator

Omni Calculator returns the inventory turnover ratio, inventory days, and average inventory from four inputs, with the formulas printed on the page and no signup of any kind.

Omni Calculator's inventory turnover tool is the best pure calculator in this category. It takes cost of goods sold, beginning inventory, ending inventory, and the period, and returns three figures rather than one.

It prints the arithmetic openly: average inventory equals beginning plus ending divided by two, turnover equals COGS divided by average inventory, and inventory days equals 365 divided by turnover.

Its worked examples use two real companies rather than invented ones, showing Skyworks Solutions at a turnover of 3.2 and 113 inventory days against Broadcom at 6.74 and 54.1 days, both from fiscal 2019.

Key inputs and outputs

• Inputs: cost of goods sold, beginning inventory, ending inventory, period
• Outputs: turnover ratio, inventory days, average inventory
• All three formulas shown on the page
• No email, no signup, no commercial upsell
• Cross-links to discounted cash flow, current ratio, and quick ratio calculators

Pricing

Free, with no account and no gate.

Who should choose Omni Calculator

• Anyone who wants the ratio and the days figure in under a minute
• Owners rebuilding the calculation in their own spreadsheet
• Students and bookkeepers who want the formula alongside the answer

Limitations

Omni publishes no industry benchmark, and its two worked examples are semiconductor companies from fiscal 2019, which tells a boutique owner nothing about their own category. It also has no idea what's inside the ratio, because it only ever sees three aggregate numbers.

Omni Calculator vs Cash Margin Partners

Omni Calculator is faster, simpler, and better than us at the one job it does, and an owner who wants a turnover ratio right now should use it rather than connect anything. Cash Margin Partners offers a directional questionnaire estimate. Its separate workspace supports eligible SKU-level analysis after a compatible import.

3. QuickBooks: Best Calculator Attached to Your Bookkeeping

QuickBooks publishes a free inventory turnover calculator taking COGS, beginning inventory, and ending inventory, with the formula and the 365-day days-in-inventory variant shown on the page.

The QuickBooks global calculator is the most useful option for anyone whose COGS figure already lives in QuickBooks, because the three inputs are three reports away.

It shows both formulas, including the days-in-inventory variant, which several competitors omit.

Its US-site version at a different URL uses sliders instead of number fields, capped at $25 million of COGS and $2 million of average inventory. The global version is the better one to use.

Key inputs and outputs

• Inputs: cost of goods sold, beginning inventory, ending inventory
• Outputs: turnover ratio, with the 365-day days-in-inventory formula shown
• No email or account required for the calculation
• A qualitative jewelry-store versus supermarket comparison in place of numeric benchmarks
• Upsells a QuickBooks 30-day trial and a sales chat

Pricing

Free. QuickBooks subscription pricing is separate and not shown on the calculator page.

Who should choose QuickBooks

• Retailers whose books already sit in QuickBooks
• Owners who want the days variant explained alongside the ratio
• Anyone comparing turnover across several periods from filed accounts

Limitations

QuickBooks returns the ratio without the days figure calculated, leaving the reader to do the second step by hand. It publishes no numeric benchmarks, and the page exists to sell a QuickBooks trial, which shapes what it does and doesn't tell you.

QuickBooks vs Cash Margin Partners

QuickBooks puts the calculator next to the ledger that holds the inputs, which removes the most annoying part of the exercise. Cash Margin Partners offers a directional questionnaire estimate. Its separate workspace supports eligible SKU-level analysis after a compatible import.

4. Enerpize: Best for Days Inventory Outstanding Calculated for You

Enerpize returns average inventory, cost of goods sold, turnover ratio, and days inventory outstanding from three inputs, free and instant with no signup.

The Enerpize calculator does what most of this field leaves half-finished: it calculates days inventory outstanding rather than showing the formula and stopping.

Days inventory outstanding is the number an owner can act on. A turnover of 4.1 is abstract; 89 days of stock sitting on the floor is a lease payment.

Its worked examples are invented rather than drawn from filings, so treat them as illustrations rather than benchmarks.

Key inputs and outputs

• Inputs: cost of goods sold, beginning inventory, ending inventory
• Outputs: average inventory, COGS, turnover ratio, days inventory outstanding
• Free and instant, with no email required
• Two invented worked examples on the page
• Upsells the Enerpize ERP platform

Pricing

Free, with no account required for the calculation.

Who should choose Enerpize

• Owners who want days inventory outstanding without a second calculation
• Anyone comparing several periods quickly
• Businesses evaluating Enerpize's wider platform anyway

Limitations

Enerpize publishes no benchmarks and its worked examples are fictional stores rather than real filings. It's also the least-known name on this page, which matters if you need to show your working to a lender or an accountant.

Enerpize vs Cash Margin Partners

Enerpize gives an owner the days figure instantly with no connection and no account, which is a fair trade for a quick check. Cash Margin Partners offers a directional questionnaire estimate. Its separate workspace supports eligible SKU-level analysis after a compatible import.

5. Zoho Inventory: Best for an Industry Selector, If the Numbers Ever Appear

Zoho Inventory offers a free turnover calculator returning the ratio only, alongside an industry average selector covering 20 industries whose figures are not exposed on the page.

Zoho's calculator takes COGS, beginning inventory, and ending inventory and returns one line: "Your Inventory turnover ratio is..." with a Recalculate button.

The formula is shown, expressed as COGS times two divided by beginning plus final inventory, which is the same calculation written differently.

Its industry average selector lists 20 categories including grocery stores, retail apparel, wholesale, pharmacy, and food processing. No numeric values and no source attribution are exposed in the page, so treat any figure it shows as unsourced until Zoho publishes where it came from.

Key inputs and outputs

• Inputs: cost of goods sold, beginning inventory, ending inventory
• Outputs: turnover ratio only, with no days figure
• An industry average selector covering 20 industries
• Formula shown on the page
• Companion free calculators for beginning inventory and wholesale price

Pricing

Free, with no account required for the calculation. Zoho Inventory's own subscription pricing is separate.

Who should choose Zoho Inventory

• Businesses already inside the Zoho ecosystem
• Owners who want the beginning inventory calculator in the same place
• Anyone who only needs the bare ratio

Limitations

Zoho returns the ratio without the days figure, which leaves the most useful half of the analysis undone. Its industry selector promises benchmark comparison and exposes no numbers or source, and the page is built to move a reader toward a Zoho Inventory signup.

Zoho Inventory vs Cash Margin Partners

Zoho sits inside a full inventory platform, so a business already running Zoho gets the calculator and the system from one vendor. Cash Margin Partners offers a directional questionnaire estimate. Its separate workspace supports eligible SKU-level analysis after a compatible import.

6. CalculatorSoup: Best for Turnover Alongside Three Other Ratios

CalculatorSoup bundles inventory turnover into an Operations Ratios Calculator that also returns total asset turnover, average collection period, and equity multiplier from a single set of inputs.

The Operations Ratios Calculator takes eight inputs and returns four ratios at once, which suits anyone reviewing a whole balance sheet rather than a single metric.

Inventory turnover has no dedicated page on the site. The dedicated URL returns a 404, and the bundled calculator is the only route.

Its useful feature for anyone building a resource page is an embeddable widget, offered as "Get this Calculator for Your Website."

Key inputs and outputs

• Inputs: COGS, inventory, sales, total assets, accounts receivable, sales for period, shareholder equity, reporting days
• Outputs: inventory turnover, total asset turnover, average collection period, equity multiplier
• Free and instant with no email
• An embeddable widget for other sites
• Reference links to Accounting Coach and My Accounting Course

Pricing

Free, with no account.

Who should choose CalculatorSoup

• Owners reviewing several operating ratios in one pass
• Accountants and bookkeepers working from a full balance sheet
• Anyone embedding a calculator on their own site

Limitations

Eight inputs is a lot of typing for one ratio, and there's no dedicated turnover page because the standalone URL 404s. It publishes no benchmarks and no days-in-inventory output.

CalculatorSoup vs Cash Margin Partners

CalculatorSoup covers four ratios at once, which is more financial ground than any inventory tool attempts. Cash Margin Partners offers a directional questionnaire estimate. Its separate workspace supports eligible SKU-level analysis after a compatible import.

7. MiniWebtool: Most Outputs, Least Sourcing

MiniWebtool returns turnover, days sales of inventory, an efficiency rating, and a benchmark comparison across eight sectors, with no source cited for any of the benchmark figures.

MiniWebtool's calculator gives more output than anything else here. It takes COGS, inventory as either an average or a beginning and ending pair, and a period, then returns the ratio, days sales of inventory, an efficiency rating, and a comparison against its own sector table.

That sector table is the problem. It shows low, average, and high ranges across eight sectors with no source attached to any of them.

Use the calculation and ignore the benchmark. A number with no provenance is worse than no number, because it feels like evidence.

Key inputs and outputs

• Inputs: COGS, average inventory or a beginning and ending pair, period set to annual, quarterly, or monthly
• Outputs: turnover ratio, days sales of inventory, efficiency rating, benchmark comparison
• A monthly and quarterly period toggle, which most competitors lack
• An eight-sector benchmark table with low, average, and high ranges
• Free with advertising, plus a premium upsell and a Chrome extension

Pricing

Free, supported by advertising, with a "Go Premium" option to remove it.

Who should choose MiniWebtool

• Owners calculating turnover monthly or quarterly rather than annually
• Anyone who wants days sales of inventory and the ratio in one view
• Users comfortable ignoring an unsourced benchmark table

Limitations

Its eight-sector benchmark table carries no source, which makes the most prominent feature on the page unusable as evidence. The site runs ads and an ad-block modal, and its "efficiency rating" is a label rather than a measurement with a stated basis.

MiniWebtool vs Cash Margin Partners

MiniWebtool returns more numbers per visit than anything else on this page, and its monthly and quarterly toggle is a real convenience for seasonal stores. Cash Margin Partners offers a directional questionnaire estimate. Its separate workspace supports eligible SKU-level analysis after a compatible import.

Master Comparison: Six Ratio Calculators and a Trapped-Cash Estimate

How to Choose an Inventory Turnover Calculator

1. Pick one that returns days alongside the ratio. Omni Calculator, Enerpize, and MiniWebtool all do. A ratio of 4.1 means less to a store owner than 89 days of stock.
2. Ignore every unsourced benchmark you find. Four vendors publish ideal ranges in articles with no citation, and one calculator shows a sector table the same way.
3. Use consistent inventory figures. Beginning and ending inventory at cost, from the same two dates every period, or the trend is noise.
4. Run it by category as well as store-wide. A single store-wide number hides the categories doing the damage, and most calculators can only take one set of inputs at a time.
5. Follow the ratio down to the shelf. The calculator tells you there's a problem. It can't tell you which 30 SKUs are causing it.

Why Turnover Hides Dead Stock

Inventory turnover is an average, and averages hide distributions. A store turning six times a year looks healthy while holding SKUs that sold nothing in eleven months, because the fast movers carry the arithmetic.

Consider a 900-square-foot boutique with $120,000 of inventory at cost and $500,000 of COGS. Turnover reads 4.2 and days in inventory reads 87, both unremarkable for specialty retail.

Underneath that average, $41,000 sits in 312 SKUs with zero sales in 11 months, against a $9,200 monthly rent. The ratio never mentions it, because the other $79,000 is moving fast enough to cover for it.

This is the case for running the calculation by category and then by SKU. The store-wide figure is a screening tool, and treating it as a diagnosis is how a healthy-looking ratio sits on top of three months of rent.

Key data point

Shopify's editorial guidance on turnover cites CSIMarket for a retail average of 10.86 annually and roughly seven times per year for consumer discretionary brands, as published on its retail resource page. That figure was current as of the first quarter of 2023, so check CSIMarket directly before using it as a present-day comparison.

Plan a 90-Day Inventory Review

This is a suggested workflow, not a promise of recovered revenue.

Week 1: review the evidence

Cash Margin Partners offers read-only Shopify, Square, and Lightspeed Retail X-Series connections where production launch status and workspace eligibility permit. Lightspeed is a capacity-managed X-Series custom application, excluding R-Series, eCom, and Restaurant. Compatible item-level uploads remain available after column review; Clover uses that export path, not a native connection.

Shopify supplies unit cost when available; Square and Lightspeed analyses add costs through CMP's prefilled template. Confirm the observation window, cost completeness, returns, and any sales outside the source before judging individual SKUs.

Weeks 2 to 4: choose actions

Review eligible SKU-level markdown and recovery recommendations, same-category bundle suggestions, margin floors, and liquidation candidates. The owner approves and executes each action through the store's existing systems. A failed markdown alone does not prove that an item should be liquidated.

Weeks 5 to 12: measure again

Refresh the source data and compare what sold, what remains, and actual net proceeds after costs. Directional 30-, 60-, and 90-day inventory-risk estimates and confidence signals require a recent successful supported live connection with sufficient usable history and cost evidence. They support decisions and do not guarantee future sales or recovery prices.

The proposed CMP Exchange publishes a 20% fee on a completed marketplace transaction, with no software subscription. Live listings, Stripe checkout, payouts, and buyer availability remain subject to production acceptance and workspace eligibility; no sale or payout timing is guaranteed.

How to Vet an Inventory Turnover Tool

Does it return days, or only the ratio?

Days in inventory converts an abstract multiple into a length of time you're paying rent on. Three of the seven calculate it for you; the rest show the formula or skip it.

Does it cite a source for any benchmark it shows?

None of them do. If a tool shows you an industry average with no citation, use it as decoration and compare to your own prior periods instead.

Is the formula visible?

A visible formula means you can build it once in a spreadsheet and stop visiting the page. Omni Calculator, QuickBooks, and Zoho all show theirs.

Can it handle a period shorter than a year?

Seasonal retail needs quarterly and monthly views, and most of these tools assume an annual period. MiniWebtool is the only one here with a period toggle.

Does the page exist at all?

Four heavily linked turnover calculators return 404s or a maintenance notice as of September 2026. Check the URL before trusting a roundup that recommends one.

Start Here: Four Steps This Week

1. Pull COGS and your beginning and ending inventory at cost for the last 12 months. Three numbers, and they're already in your books.
2. Run them through Omni Calculator and write down the ratio and the days figure. That's your baseline.
3. Repeat it for your two largest categories separately. The gap between them is usually where the cash is stuck.
4. The free five-step calculator provides a directional trapped-cash estimate from questionnaire answers. A separate free workspace supports SKU-level analysis after a supported store connection or compatible item-level upload.

Frequently Asked Questions

What is the best inventory turnover calculator?

Omni Calculator is the best free instant inventory turnover calculator, returning the turnover ratio, inventory days, and average inventory with the formulas printed on the page and no email required. Retailers who want the answer in dollars rather than as a ratio should run a SKU-level analysis against their own sales data instead.

What is the formula for inventory turnover?

Inventory turnover equals cost of goods sold divided by average inventory, where average inventory is beginning inventory plus ending inventory divided by two. Days in inventory equals 365 divided by the turnover ratio.

Does Shopify have an inventory turnover calculator?

No. Shopify's free tools index lists a business loan calculator and a profit margin calculator, and no inventory turnover tool. Shopify covers the topic in editorial articles, and its native admin reports include Products by sell-through rate rather than a turnover calculator.

Is there an inventory turnover calculator with industry benchmarks?

None of the free calculators verified in September 2026 publishes sourced benchmark data. MiniWebtool shows an eight-sector benchmark table with no source cited, Zoho Inventory offers an industry selector with no numbers exposed, and Omni Calculator, QuickBooks, and CalculatorSoup show no benchmarks at all.

What is a good inventory turnover ratio for a retailer?

There's no single figure, and every uncited range published by an inventory vendor should be treated as marketing. Compare your ratio to your own prior periods and to the categories inside your own store, where the data is yours and the comparison is fair.

Why does inventory turnover miss dead stock?

Inventory turnover is a store-wide average, so fast sellers hide slow ones. A store turning six times a year can still hold thousands of dollars in SKUs that sold nothing, because the average says nothing about the distribution underneath it.

Do any inventory turnover calculators require an email address?

The six ratio tools are described individually above. Cash Margin Partners requests contact or account details for the full questionnaire result; it does not require a store connection or upload for that estimate.

Run the ratio, then go find the SKUs it averaged away.