Logistics & Warehouse Management Calculators

EOQ, safety stock, ABC, dim-weight, pallet loading, container fill, and TSP/VRP routing calculators for warehouse and freight planners.

Available Tools

Inventory, packing, and routing calculators for daily operations

Warehouse and logistics planners spend most of their day turning demand forecasts into reorder points, cartons into pallets, and pallets into truck or container loads — and nearly every one of those decisions reduces to a formula that has been in operations research textbooks for decades. This page collects the calculators those planners actually reach for: EOQ and safety stock for inventory policy, ABC classification for SKU prioritisation, dim-weight and freight class for chargeable weight, pallet and container fill for outbound consolidation, and TSP/VRP heuristics for last-mile and multi-stop routing. Each tool implements the textbook formula or a named heuristic (Clarke-Wright, nearest-neighbour, 2-opt) and states its assumptions in the Theory section, so the number on the screen is traceable to a reference rather than a black-box optimiser.

Who these calculators are for

These tools are aimed at warehouse supervisors sizing a reorder quantity, S&OP planners reconciling forecast with on-hand cover, freight cost analysts checking a carrier invoice against the DIM rule the contract specifies, industrial engineers sketching a pick-path or dock schedule, and operations research students learning how EOQ, safety stock, and VRP actually behave before they pick up a solver. They are deliberately not a replacement for full WMS/ERP integration, live carrier rate shopping against current fuel and surcharge tables, slot-level put-away optimisation against a real bin map, or a commercial routing engine with traffic feeds. The formulas assume stationary demand, deterministic lead-time mean and variance, and the cost parameters you enter — if your environment violates those assumptions, treat the result as a first-pass estimate rather than a committed plan.

Reference standards and sources

Inventory tools use the classical Wilson/Harris EOQ formula (Harris, 1913; Wilson, 1934) and the normal-distribution safety-stock expression SS = z · σ_L, with service-level factors from standard statistical tables. ABC classification follows the Pareto 80/20 convention as described in Silver, Pyke & Peterson, Inventory Management and Production Planning. Freight class follows the NMFC (National Motor Freight Classification) density-based bands, and dim-weight uses the industry DIM-factor conventions — US domestic 139 in³/lb (UPS/FedEx), international 5000 cm³/kg, air IATA 6000, ocean LCL 1000. Container capacity assumes standard TEU/FEU dimensions (ISO 668) and ISO 6780 pallet footprints (1200×1000 EUR, 1200×800 EUR, 1219×1016 US GMA). Routing tools implement the Clarke-Wright savings algorithm for VRP and nearest-neighbour plus 2-opt for TSP. Queue and throughput relationships follow Little's Law (L = λW).

What these calculators do not cover

These calculators do not pull live carrier rates, apply current fuel or accessorial surcharges, or shop rate tables across LTL and parcel carriers — the dim-weight and freight-class tools give you the chargeable inputs, not a quoted price. They do not compute customs duties, HS-code tariffs, or landed cost; they do not integrate with WMS, ERP, or TMS systems; they do not read a real bin map to perform slotting or put-away optimisation; they do not validate SSCC or GS1 label content; and they do not model cold-chain temperature profiles, shelf-life decay, or pharma-grade excursion tracking. The VRP and TSP solvers are heuristic and intended for small-to-medium instances — they will not match a commercial routing engine with traffic, time windows, driver HOS, and multi-depot constraints. If you need any of the above, treat these tools as a sanity check on the commercial system's output, not a replacement for it.