Estimate the classic economic order quantity from annual demand, order/setup cost and annual holding cost per unit.
EOQ Calculator
Formula
How to use the result
EOQ assumes relatively stable demand and costs and does not automatically account for quantity discounts, capacity limits, minimum orders or service-level requirements.
What the calculator does not know
These tools are general inventory-planning aids, not accounting, tax, regulated-product, hazardous-material, food, pharmaceutical or safety-stock policy advice. Requirements for controlled, perishable or safety-critical inventory can be materially different; use applicable regulations, contracts, manufacturer requirements and qualified professional guidance.
Improve the estimate
Keep the inputs used for the decision and compare the estimate with actual results. A simple calculator is most useful when it makes the assumptions visible enough to learn from the difference.