Units per Order
Units per Order (UPO) is the average number of individual items in each customer order over a period, also called units per transaction.
Why it matters for ecommerce brands
UPO drives packaging size, pick labor, and how much per-order costs like postage are spread across. Raising it lowers fulfillment cost per unit.
Formula and calculator
Units per order = total units shipped ÷ total orders shipped
Common questions
- How do I increase units per order?
- Common tactics are bundles, multipacks, free-shipping thresholds set above the typical cart, and product recommendations at checkout. Check that added units do not push packages into a higher dimensional weight tier.
Cite this entry
"Units per Order (UPO)." Fulfillment Lexicon, last reviewed October 16, 2026. https://fulfillment.wiki/glossary/units-per-order/