22 calculators · No login · Free
StockWise is a focused toolkit of inventory calculators built for warehouse leads, ecommerce sellers and small operations managers. No spreadsheets to wrestle, no demo to book — type your numbers, get a result you can actually defend in a meeting.
Calculations run in your browser. We do not store any input you type.
Quick picks
Click any card to jump straight to the tool, with worked explanations on the same page.
Core ratios every operator should know: turnover, days of stock, EOQ, reorder point, ABC and DSI. Each page shows how to interpret the number.
Physical-world calculations: how many boxes fit on a pallet, slotting efficiency, pick-path travel time and how often to cycle count.
Stop buying what your gut tells you. Variability, lead-time demand and stockout probability with confidence bands — not a single magic number.
Translate physical inventory into dollars. Carrying cost, dead stock, working capital, GMROI and shrinkage loss — the conversations finance actually cares about.
Suppliers are inventory risk. Score them on what actually matters, decide whether a MOQ makes sense, and price total cost of ownership — not just the unit cost.
Each calculator tells you what the number means — not just what it is. Most pages on the web hand you a formula; we tell you when the formula is wrong for your situation.
Inputs stay in your browser. No account, no email. We make money from ads on pages — never from your data.
Walk the warehouse with your phone. Big inputs, big buttons, single-column fall-through on narrow screens.
StockWise is a single-purpose toolkit built for the people who actually run inventory day to day — the warehouse lead trying to justify a reorder before Friday, the ecommerce operator who needs to know if they can absorb a 3× spike, the operations manager whose CFO just asked what their GMROI is. Every calculator on this site exists because somebody asked the question out loud in a real meeting and we couldn't find a quick, no-nonsense answer online.
What this site is for: quick directional answers, sanity checks, training new staff, comparing scenarios. What this site is not for: replacing an ERP, generating SOX-compliant reports, or pricing exotic supply contracts. If a number here will move money or trigger a regulatory decision, double-check with the underlying system.
We have tried to include original commentary on each tool — when to use a metric, when not to, what assumptions are baked in. If you spot something wrong, please tell us via the contact shown in the footer.
Data we do not collect. StockWise Tools does not require an account, does not ask for your name or email to use a calculator, and does not transmit the numbers you enter to any server. All calculations run client-side in your browser.
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Children. This site is not directed to children under 13, and we do not knowingly collect any information from children.
Changes. Any updates to this policy will be posted on this page. Effective: 2026.
All calculators on StockWise Tools are provided for informational and educational purposes only. They do not constitute professional accounting, legal, tax, supply-chain, or financial advice. Outputs are based on the values you enter and the assumptions documented on each tool page; real-world results will depend on factors the calculators cannot model — supplier behaviour, demand shocks, system configuration, data quality, and regulation.
Before making material decisions based on any number shown here — particularly inventory write-downs, large purchase orders, or supplier changes — verify the inputs against your own records and consult a qualified professional. We make no warranty as to the accuracy, completeness, or fitness for any particular purpose of the calculations.
External links (where present) are provided for context. We are not responsible for the content of linked sites.