Independent ecommerce sellers
One person or a small team planning purchases SKU by SKU, without an inventory planning system.
Free ecommerce inventory tools
Plan what to reorder, when to reorder, and how much to buy.
StockPilot helps ecommerce sellers decide when to reorder, how much to buy, and how much cash a purchase may require. Every tool is free, runs entirely in your browser, and never connects to a seller account.
Free, no account required. Inputs and calculations stay in your browser; nothing is uploaded.
How it works
Three steps to a replenishment decision
- Enter SKU-level inventory and demand inputs. On-hand stock, average daily sales, and supplier lead time for one product at a time.
- Review stockout timing and reorder status. See estimated days of cover, the reorder point, and whether confirmed inbound arrives in time.
- Adjust for lead time, MOQ, case packs, and target coverage. Turn the raw numbers into an orderable quantity with an estimated purchase cost.
Who it is for
Built for hands-on sellers
Small online retailers
Shops that want a repeatable way to decide when to reorder and how much to buy.
Cross-border sellers
Sellers working with long supplier lead times, freight, duties, and case-pack constraints.
Small importers and wholesalers
Businesses that need to see the cash a purchase order requires before committing to it.
Selling context
Choose your selling platform
StockPilot does not connect to Amazon, Shopify, Etsy, Walmart, or WooCommerce, and never imports seller data. Platform selection only changes general input guidance, not calculations.
Calculations are channel-neutral. Use values for the inventory pool and demand you are planning.
Task-first tools
What are you trying to decide?
When should I reorder?
See timing, stockout risk, inbound, and order quantity in one SKU-level view.
Open Reorder PlannerAlso: Reorder Point CalculatorHow much safety stock should I hold?
Estimate a buffer from demand and lead-time variability inputs.
Open Safety Stock CalculatorWhen could I run out?
Estimate on-hand cover and compare confirmed inbound timing.
Open Stockout Date CalculatorHow much should I order?
Estimate net need, then account for MOQ and case-pack multiples.
Open Purchase Order Quantity CalculatorWhat order size costs least?
Balance annual ordering cost against holding cost with the EOQ formula.
Open EOQ CalculatorHow fast does my stock turn?
Check annualized turns and average days of inventory from COGS.
Open Inventory Turnover CalculatorWhat is my true unit cost?
Add freight, duty, insurance, and fees to product cost per unit.
Open Landed Cost CalculatorWhat does holding stock cost me?
Estimate annual capital, storage, insurance, and loss costs from inventory value.
Open Holding Cost CalculatorHow much cash is in my stock?
Value on-hand inventory at cost and see how long it takes to convert back to cash.
Open Cash Tied Up CalculatorPlanning a whole list of SKUs?
Load a CSV and review stockout timing, reorder points, and order quantities for every SKU at once. Processed locally in your browser.
Open Bulk Inventory PlannerFree, no account required. Calculations run locally in your browser and are estimates, not purchase instructions.
Planning decisions
Check the decision before the purchase order
When to reorder
Compare on-hand stock with demand during the lead-time window and the safety buffer you choose.
How much to buy
Estimate a quantity against target coverage, confirmed inbound timing, MOQ, and case-pack rules.
What a purchase may cost
Multiply the planned order quantity by unit landed cost for a simple purchase-cost estimate.
Featured tool
Reorder Planner
Bring stock position, inbound arrival timing, supplier lead time, and purchase constraints into one SKU-level planning view.
- Estimate on-hand stockout timing and reorder point.
- Model confirmed inbound inventory by arrival date.
- Plan a quantity for target coverage after the new order arrives.
- Apply MOQ and case-pack rounding and estimate purchase cost.
Tool categories
Choose a planning task
Replenishment Planning
Inventory Health
Purchasing & Cost
Method
How StockPilot approaches inventory planning
On-hand stock and confirmed inbound stock are different: inbound units cannot support sales until they become sellable. Their arrival timing matters when estimating stockout risk and projecting inventory at a new purchase order’s arrival.
Supplier constraints such as MOQ and case packs can change a theoretical quantity into a different order size. Results are planning estimates based on your inputs, not a substitute for a full ERP, demand forecast, or purchasing policy.
Before acting on a result, review the sales rate, lead-time definition, confirmed receipts, supplier constraints, warehouse capacity, cash availability, and your own inventory policy.
Read inventory planning basics or explore the reorder point calculator and stockout date calculator.
FAQ
Common questions
Are these tools free?
Yes. The tools in this static prototype are free to use in your browser.
Is my inventory data uploaded?
No. Calculator inputs are processed locally in your browser. This prototype does not upload or save your values.
Can I use this for Amazon, Shopify, Etsy, and wholesale?
The calculations are channel-agnostic. Use figures for the stock pool you are planning, and combine demand across channels when inventory is shared.
Does StockPilot replace inventory software?
No. These tools provide per-item planning estimates and do not replace an ERP, forecast, or purchasing approval process.
Which tool should I start with?
Start with the Reorder Planner for a combined view of on-hand stock, inbound timing, stockout risk, projected inventory at new PO arrival, suggested purchase quantity, and estimated purchase cost.