Planning Calculators

Inventory management calculators. MOQ vs cash flow, reorder point, safety stock, inventory turnover, dead stock cost, landed cost, customs duties, 3PL vs in-house fulfillment, shrinkage.
Inventory Turnover
How fast you sell through.
Landed Cost Calculator
True per-unit cost from factory.
Reorder Point
When to reorder inventory.
Safety Stock
Buffer inventory to prevent stockouts.
Inventory Cash Tied Up
Working capital locked in current inventory.
Dead Stock Cost
Revenue lost to unsold inventory sitting in WH.
Fulfillment Cost Comparison
In-house vs 3PL vs FBA per-order cost.
MOQ vs Cash Flow
Can you afford the supplier minimum order quantity?
Supplier Lead Time Tracker
Lead-time delays vs stockout risk.
Customs & Duties
Estimate import duties by category and country.
3PL vs In-House Cost
Third-party logistics vs in-house fulfillment math.
Inventory Shrinkage Cost
Loss, theft, damage, and admin error cost on inventory.
About planning calculators

Inventory is where most ecommerce brands have the most cash tied up — typically 40-60% of working capital. The calculators in this category quantify inventory economics so operators can decide how much to order, when to reorder, where to fulfill from, and how to detect operational drift.

These 12 tools cover the inventory lifecycle: planning (MOQ vs cash flow tradeoffs, reorder points, safety stock, supplier lead time, inventory turnover targets), fulfillment (3PL vs in-house cost, fulfillment cost comparison), cost accounting (landed cost including duties / freight / brokerage, customs duties), and risk management (dead stock cost, shrinkage from theft / damage / admin error).

The benchmarks: healthy inventory turnover is 6-12× per year for most DTC. Below 4× signals overstocking; above 15× signals frequent stockouts. Shrinkage averages 1.5-2.5% of inventory value annually; above 5% is a systemic operational problem. 3PL economics improve at 500-2,000+ orders/month. Safety stock should cover lead time variance × demand variance, typically 20-40% above expected demand.

The strategic insight: inventory cash management is more leveraged than most ad efficiency work. Reducing days-inventory-outstanding from 90 to 60 frees up 33% of inventory cash for redeployment to ads, hiring, or product development. Negotiating NET60 terms with suppliers does the same on the other side. Both compound year over year.

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