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Measure How Fast Your Inventory Sells
Find how often your stock turns over during a chosen period. Enter COGS and average inventory at cost. Or use opening and closing stock to estimate the average. This inventory turnover calculator also shows days per turn for the period you enter.
Use Matching Cost Values and Dates
Inventory turnover = COGS for the period ÷ average inventory at cost. Days per turn = days in the period ÷ inventory turnover. Match the dates and cost basis before you compare results.
Choose either the average of opening and closing inventory or enter a period average. A weekly or monthly snapshot average can better reflect changes in stock than two endpoints. The tool uses the average you provide; it does not fetch your stock records.
Read Turns in the Context of Your Store
The result describes the entered period. It is not scaled to a full year. Five turns over 365 days means something different from five turns over 90 days. Keep the time window visible when sharing the result.
A higher ratio is not always better. Look at stockouts, lead times, seasonal buying and margins before changing purchase plans. Compare similar products and matching periods. Do not treat one ratio as a target for every store.
Handle Zero Sales and Stock Carefully
When COGS is zero, the ratio is zero and days per turn has no finite value. The tool shows “No turnover.” Average inventory must be positive. A zero stock average would make the ratio undefined.
Review both the count and cost of unsold goods. A low-cost fast seller can hide a costly slow seller in a store-wide average. Use the same calculation by product group where your records support it.
Check Whether Seasonal Stock Changes the Answer
Two stock counts can miss a large buildup between them. In this hypothetical 90-day period, COGS is $60,000. Opening and closing stock both equal $10,000. Daily stock records show an average of $30,000 at cost.
Using Two Endpoints
6 TurnsAverage stock: $10,000. Days per turn: 90 ÷ 6 = 15 days.
Using the Daily Average
2 TurnsAverage stock: $30,000. Days per turn: 90 ÷ 2 = 45 days.
The same sales activity gives a very different stock cycle. The endpoint method makes this store look leaner than its daily records suggest.
Select Enter a Period Average to use the better-supported figure. Average daily balances over all 90 days, including days without sales. If you use weekly snapshots, space them evenly. Keep the same method when you compare periods.
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What Is a Good Inventory Turnover Ratio?
There is no single target for every merchant. Product type, season, supply lead time and stockout risk change what is useful.
Can I Enter My Own Average Inventory?
Yes. Select “Enter a Period Average” and use an average based on consistent cost snapshots.
Does This Use Revenue?
No. This version uses COGS and inventory at cost. Mixing sales revenue with cost-valued stock can distort the result.
Are Days per Turn a Delivery Estimate?
No. They describe the stock cycle implied by this ratio, not how long a customer order takes to ship.
Continue Your Store Workflow
Sources and Method
Sources checked November 11, 2026. The tool uses your inputs and the method described above. Source guidance does not certify your result or document.
Disclaimer
This calculator is for educational purposes only. It is a research and planning tool, not intended for commercial use. Chargeflow takes no responsibility for the outcome of any decision you make based on its results.
Results are estimates based on the inputs you enter and on published rates and rules as of the date shown. They are not a quote, an invoice, a guarantee of any cost, fee, profit or outcome, or financial, tax, accounting or legal advice. Do not rely on them to make business, financial or legal decisions.
Rates, fees, card network rules and laws change. Your own terms, eligibility, volumes and location can produce different results. Your provider statement and contract are the record. Verify every figure with official sources and a qualified professional before you act on it.
This calculator is provided as is, without warranties of any kind, express or implied, including accuracy, completeness and fitness for a particular purpose. To the fullest extent permitted by law, Chargeflow is not responsible or liable for any loss, damage or outcome that results from using this calculator or relying on its results. You use it at your own risk.
Third-party names and products appear for identification only. They do not imply affiliation or endorsement. Use of this page is also subject to our Terms of Service.
