Merchants usually arrive at order limits with a symptom, not a preference: small orders are costing money. Two rules can fix that, and they are not interchangeable.
The difference in one line
A minimum order quantity counts units. A minimum order value counts money. Which is right depends on what your cost actually scales with.
When quantity is the right rule
Choose quantity when your cost per order is driven by handling a physical thing: picking, packing, a carton that only makes sense full, a courier that charges by parcel. A six-unit minimum on a $4 product and a six-unit minimum on a $40 product protect the same pick-and-pack cost.
Quantity is also the honest rule when the packaging dictates it. If stock arrives boxed in twelves, an order for seven forces someone to break a carton, and the remaining five become awkward inventory. Shopify's native increment rules exist for exactly this case — its B2B quantity rules documentation uses the example of products boxed in multiples of ten, where an increment rule of 10 means customers buy 10, 20 or 30. We go deeper on that in selling in case packs without breaking the carton.
When value is the right rule
Choose value when your cost is a percentage or a flat fee against the money: payment processing, a fulfilment partner charging per shipment against order value, or a wholesale relationship where you have agreed a floor. A $100 wholesale minimum lets a buyer reach it with any mix of your catalogue, which is friendlier than dictating units.
Value rules also let a customer solve the problem themselves. Told "add $12 to check out", most people add something. Told "you must buy three more of this specific item", many leave.
The conversion cost you are trading against
Any minimum is friction, and friction at the cart is expensive. Baymard Institute's research puts the average documented cart abandonment rate at 70.22%, calculated across 50 separate studies. In the same research, among shoppers who abandoned for a reason beyond browsing, 40% cited extra costs being too high — shipping, tax and fees — and 17% left because checkout felt too long or complicated.
That is the number to hold in your head. A minimum is not free. It is a deliberate trade: fewer orders, better orders. Which is fine, as long as you know which side you are buying.
Three things that decide it in practice
- Say it early. A minimum discovered at checkout reads as a bait and switch. A minimum shown on the product page reads as a policy. Same rule, very different abandonment.
- Scope it, don't blanket it. A wholesale floor should apply to wholesale buyers, not to a retail shopper buying one candle. Both quantity and value rules become far less costly when they are scoped to a customer tag or a market.
- Enforce the one you keep. If the rule matters to your margin, it needs to hold at checkout rather than in your theme — see what Shopify does natively and where it stops.
When to use both
They compose well. A common wholesale setup is a per-product increment (cartons of 12) plus a cart-level value floor ($250). The increment keeps your warehouse sane; the floor keeps the order worth shipping. Neither alone does both jobs.
