Economic Order Quantity Calculator
EOQ balances ordering cost against holding cost to minimize total inventory expense. Enter your annual demand, freight cost per order, and warehousing cost to find the mathematically optimal order size for China imports.
Built from current calculator assumptions plus typical import cost benchmarks used by China sourcing teams.
Use this to pressure-test margin and landed cost. Final profitability still depends on your freight quote, duty classification, and downstream selling costs.
economic order quantity calculator
Medium SERP difficulty
EOQ: Finding the Sweet Spot
Ordering large batches minimizes freight costs and unit price, but maximizes storage costs and cash constraints. The EOQ formula mathematically determines the intersection where your total costs are lowest.
Particularly with China imports, ordering one FCL (Full Container Load) is often used as a default EOQ because the reduction in freight costs per unit (compared to LCL) heavily offsets the increased holding costs.
How to use the economic order quantity calculator
Calculator queries that rank well in Google usually do more than output a number. Searchers want to know what the number means, which inputs move it the most, and how to validate it before money is committed. That is the role of this economic order quantity calculator. It is designed to turn a rough import question into a structured planning exercise by collecting inputs such as Annual Demand (units), Cost Per Order, Unit Cost (landed), and Annual Holding Cost Rate and converting them into outputs such as EOQ, Orders Per Year, Average Inventory, Annual Ordering Cost, and Annual Holding Cost. For an importer, that is the difference between a vague estimate and a number that can actually be used in sourcing, budgeting, freight planning, or internal margin review.
The best workflow is to start with the facts you can verify today and then rerun the tool as better information arrives. A supplier quotation, an updated incoterm, a revised carton size, or a new customs assumption can all move the answer materially. That is why this tool works best when it is used early and then used again before approval, payment, and shipment. The goal is not to create a perfect forecast on the first pass. The goal is to identify the inputs that matter enough to justify deeper checking with your broker, forwarder, lab, supplier, or finance team.
For this category, the main planning drivers are unit cost, packaging, freight allocation, customs charges, marketplace fees, return assumptions, inventory carrying cost, and expected selling price. If you only review one part of the calculation, review those items first. They are the assumptions most likely to change the landed cost, compliance burden, lead time, or working-capital requirement enough to affect the final decision. SERP leaders in calculator queries tend to win because they help users understand those drivers instead of leaving them with a black-box result, so this page now does the same.
What to gather before you trust the result
Before relying on any output, gather supplier quotations, packaging specs, freight estimates, duty assumptions, channel fees, target margin, and the reorder quantity you expect to commit to. Those details are what convert a generic calculator into a commercially useful one. If the supplier changes the price basis, if the shipment mode changes, if the product classification shifts, or if the destination market introduces a different rule, the result should change with it. Many thin calculator pages fail in Google because they give the user a number without explaining what inputs deserve attention. This page is meant to close that gap by making the calculation part of a repeatable decision workflow, not a one-click shortcut.
Google SERP patterns for calculator and import-guide queries consistently reward pages that explain manual logic, practical use, and next-step validation. In practice, that means using the result as a planning range instead of a guaranteed final cost. Run a base case using the most likely assumptions, a conservative case using slower clearance or higher fees, and a stress case if the product sits in a sensitive category. That approach is especially useful for importers because one small error in customs, freight, or compliance assumptions can wipe out a margin that looked healthy in a single optimistic scenario.
A useful internal question is simple: if the answer is worse than expected, which input would you negotiate first? Sometimes the answer is unit cost. Sometimes it is packaging, payment terms, route selection, or certification scope. The calculator helps you find that lever sooner. Never compare suppliers by FOB price alone. A supplier $0.50 cheaper on FOB can easily be more expensive once freight, duty, and compliance differences are factored in. Always compare landed cost. When you combine that discipline with supplier documents and published government references, the result becomes much more useful for real purchasing decisions.
How to validate the estimate with official sources
The final step is verification. Planning tools should help you discover what to check next, not tempt you to skip the check. That is why this page pairs the calculator with official references such as CBP Importing and Exporting, HMRC Import VAT Valuation, and CBSA Customs Tariff. Those sources are where you confirm the live rule that applies to your shipment, product, or destination market. They are especially important when tariff treatment, import valuation, documentation, or regulatory scope can change after an update from customs or a regulator.
For this category, the safest workflow is to build from unit economics outward by calculating landed cost first, then gross margin, then break-even volume, and finally the cash required to support reorders. If the answer from the calculator and the answer from the official source tell different stories, the official source wins and the model should be updated. That sounds obvious, but many import losses happen because a business keeps using an old spreadsheet or an old rule after the commercial facts have moved. Verifying the current rule before approving production or booking freight is usually far cheaper than fixing a customs, compliance, or margin problem after the shipment is already moving.
The core risk to avoid here is comparing factories on ex-works or FOB price alone while leaving freight, compliance, and selling-channel costs out of the model. That risk usually appears late, when leverage is weakest and the cost of correction is highest. Use the result from this page as the first pass, then pressure-test it with supporting documents and government guidance. That mirrors the way high-performing calculator pages on Google support user intent: a fast answer first, followed by explanation, formula context, interpretation, and the path to real-world validation.
Official Sources for Product Costing
Use these government sources to confirm the live rule, tariff treatment, valuation basis, or import procedure behind the estimate on this page before you rely on it for a shipment, quotation, or reorder decision.
- CBP Importing and Exporting - Customs fees and importer responsibilities.
- HMRC Import VAT Valuation - How the UK values imports for VAT.
- CBSA Customs Tariff - Canada tariff rates and treatment framework.
- ABF Import Costs - Australian duty, GST, and import cost guidance.
Tips for China Importers
- Never compare suppliers by FOB price alone. A supplier $0.50 cheaper on FOB can easily be more expensive once freight, duty, and compliance differences are factored in. Always compare landed cost.
- Include platform fees in your landed cost model. Amazon FBA referral + fulfillment fees total 30–40% of your selling price. If that's your channel, it must be in your cost calculation from day one.
- Add a 15% cost contingency for your first import. First-time importers consistently underestimate costs — unexpected charges like detention fees, inspection costs, or currency moves routinely add 10–20%.
- Calculate break-even units before ordering. Know exactly how many units you must sell to cover your landed cost and fixed overheads. If break-even is more than 60% of your order, the risk is too high.
- Recalculate on every reorder. Freight rates, duty rates, and supplier prices all change. A cost model from 6 months ago can be meaningfully wrong. Always recalculate before committing to a new order.