24 standalone calculators and analyzers for warehouse managers, ecommerce operators and small business owners who need a defensible number — not another SaaS subscription. Each tool runs entirely in your browser.
Each tool returns a number with a context — not just a formula.
All computation runs in your browser. No data sent anywhere.
Mobile-friendly layout. Use them on the warehouse floor if needed.
Each tool explains what it's good for, what it isn't, and how to interpret.
Grouped by what you actually use them for. Every link opens a standalone page.
Classify SKUs by revenue, volume or margin. Cumulative chart included.
Turnover ratio with industry benchmark vs your value, plus DSI.
Gross Margin Return on Inventory Investment — product mix view.
Age buckets 30/60/90/180/365 with capital-tied-up view.
Compares total cost at each price break — not just the textbook formula.
ROP with safety stock plug-in and service-level target.
Max-min, average demand, and service-level Z-score — compared side-by-side.
Min/max levels with consumption variance buffer (for perishable goods).
How often to reorder so cycle stock, ordering cost and shelf life stay balanced.
Weighted feasibility scoring across 6 dimensions — honest, not evangelical.
Capital, storage, insurance, shrinkage, obsolescence — broken out, not blended.
Run the same scenario through three cost methods and see the difference.
Total cost curve visualization — where ordering cost equals carrying cost.
DIO + DSO − DPO and what shrinking it does to working capital.
DSI with cash-flow interpretation, not just a number.
Volumetric efficiency scoring for storage bins and cartons.
Distance, items, congestion — honest time estimate, not vendor-marketing speeds.
Area + volume efficiency in one number. Spot the dead space.
Cpk of supplier lead times. Are they consistent, or do you need a buffer?
A practical order, if this is your first time.
Run Inventory Turnover and Carrying Cost on your last 12 months. You need accurate demand, COGS and inventory value before any of the rest makes sense.
Use ABC Analysis on revenue, then on margin. The intersection tells you which SKUs actually deserve your attention.
Roll EOQ, Reorder Point and Safety Stock into something your team can actually follow. Test for 90 days.
Most inventory tools online either oversimplify to the point of being wrong, or push you into a free trial of an enterprise platform. ShelfIQ is the middle ground — a defensible number with the assumptions stated and the limits called out.
Each tool page is written from operator experience. We don't rewrite textbook formulas; we say what they get wrong in practice.
Calculations run entirely in your browser. We do not collect the numbers you enter. See our Privacy Policy.
Every tool has a "What it doesn't do" section. We don't pretend a calculator can replace your ERP.
The unique additions (discount-tier EOQ, 3-method safety stock, 5-component carrying cost) are what we wish had existed when we ran warehouses ourselves.