About the Economic Order Quantity Calculator
EOQ — the order size that minimises total ordering and holding cost — with orders per year and total cost.
Also known as: economic order quantity, eoq formula, optimal order size, wilson formula.
How to use this calculator
- Enter annual demand, cost per order, holding cost per unit per year.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
EOQ = √(2DS / H)
- D
- = annual demand
- S
- = cost per order
- H
- = holding cost per unit per year
Worked example
Using the values pre-filled in the calculator above:
- Annual demand = 12,000 units
- Cost per order = 120
- Holding cost per unit per year = 3.5
the calculator returns:
- EOQ: 907 units
- Orders per year: 13.2
- Days between orders: 27.6
- Total annual cost: 3,174.9