With the illustrative inputs below, the result is 126.4911 units per order.
Try this with your own numbersFormula and worked example
EOQ = square root(2 × annual demand × ordering cost / annual unit holding cost)
| Input | Example |
|---|---|
| Annual unit demand | 1,200 |
| Cost to place one order | 40 |
| Annual holding cost per unit | 6 |
| Calculated result | 126.4911 units per order |
Choose reliable inputs
Account for turnaround, maintenance and available inventory before accepting another booking. For this tool rental calculation, use rental contracts, asset records and maintenance logs and a consistent definition of one rental booking.
- Inspection: include the portion belonging to this rental booking or reporting period, and record where the value came from.
- Repair: include the portion belonging to this rental booking or reporting period, and record where the value came from.
- Counter staffing: include the portion belonging to this rental booking or reporting period, and record where the value came from.
Use the same currency for every money input. Do not mix weekly costs with monthly revenue, or count the same expense in both an itemised cost and allocated overhead.
When does the EOQ shortcut stop fitting?
Assumes constant demand and lead time, no quantity discounts and no stockouts. Round to supplier pack sizes separately.
What if this input changes?
If annual unit demand rises by 10%, this example changes by 6.1739 units per order. This shows the effect of one change; it does not predict what will happen.
Open the calculator, save your baseline, then change the input supported by the least reliable estimate in your records. Compare both scenarios before committing to a price or capacity promise.