Bulk Order Cost Calculator

The quoted saving overstates the real one.

Written and maintained by Mohit PatelLast checked August 4, 2026How we build these

Currency

Smaller quantity

Price at that quantity

Larger quantity

Price at the larger quantity

Monthly sales

Storage per unit per month

Annual cost of capital

Annual obsolescence risk

True cost at the larger quantity

$7.88

$6.98 at the smaller one

Months of stock, small order3.3

Months of stock, large order16.7

Quoted price saving$1.20

True saving after carrying cost−$0.90

The bulk discount does not survive the carrying cost of 16.7 months of stock. A lower unit price on stock you will still be holding next year is not a saving.

How the Bulk Order Cost Calculator works

The quoted saving on a bulk order overstates the real one, because it ignores the storage, capital and obsolescence of holding more stock for longer. Sometimes the discount still wins, but the comparison has to include all three.

Also known as: large order pricing · volume purchase cost · bulk buy cost calculator

The discount and everything it brings with it

A supplier offering a better price at a higher quantity is offering a saving on one line and additional costs on several others.

The additions: more capital tied up, more storage occupied for longer, more risk if the product does not sell, and more exposure if it becomes obsolete.

The comparison that matters is total cost per unit sold rather than per unit bought. A 12% price saving on a quantity that takes eighteen months to sell, at a carrying cost of 2% a month, has cost more than it saved.

Carrying cost, and what it consists of

Inventory carrying cost is conventionally put at 20% to 30% of inventory value per year, and the components are storage, capital, insurance, shrinkage and obsolescence.

Capital is usually the largest and the least visible. Money in stock is money not available for anything else, and its cost is either the interest on borrowing or the return foregone on the alternative use.

Obsolescence dominates in fast-moving categories. Fashion, electronics and anything seasonal can lose most of their value in a year regardless of storage conditions, which makes the carrying cost far above the generic range for those goods.

Running the comparison

Take the small order: unit price, freight per unit, months of stock, carrying cost over that period. Then the large order on the same basis. Compare total cost per unit sold.

Work one. A 500 unit order at £7 with £1.20 freight per unit, selling in four months at 2% monthly carrying cost, costs £8.86 per unit sold. A 2,000 unit order at £5.80 with 55p freight, selling in sixteen months, costs £8.38.

The larger order wins here and by considerably less than the 17% price difference suggested. Change the sales rate slightly, or the carrying cost, and the ranking flips. Which is the point: the answer is not obvious and the price comparison alone reliably favours the larger order regardless of whether it should.

The risk side of the ledger

A larger order concentrates more capital in one bet, and the cost of being wrong scales with it.

The scenarios worth pricing: the product sells at half the forecast rate, the product does not sell at all, a competitor launches something better, or a supplier quality problem affects the whole batch.

Expected value handles this crudely and usefully. If there is a 20% chance the product fails and the larger order means £14,000 rather than £4,000 at risk, the expected loss from the larger order is £2,000 higher, which has to be set against the price saving.

The middle path

The choice is rarely binary. A blanket order at the volume price with staged delivery gives the unit cost of the large order and the storage profile of the small one, and many suppliers will agree to it.

The supplier gets a committed volume and predictable production; you get the price and pay for stock as it arrives. It is the arrangement that most often goes unrequested because sellers assume the price is tied to the shipment rather than to the commitment.

Where a supplier will not stage delivery, a third-party warehouse near the port can achieve something similar at a cost. Either way, the question worth asking is whether the volume price requires taking all the stock at once, and the answer is frequently no.

Where to go next

The Bulk Order Cost question rarely arrives on its own. These are the ones that usually come with it:

MOQ Cost Calculator — A lower price on two years of stock is not a saving.
Storage Days Cost Calculator — Physical storage is the smallest part.
Economic Order Quantity Calculator — The order size that minimises total cost.
Etsy Fee Calculator — Every Etsy fee on one sale, itemised.

Not financial advice. Marketplace fees change, and they vary by country, plan and seller status. Every rate here is an editable default, not a quoted price, check the platform's current fee schedule before you price a product against it. This is not tax or business advice.

Frequently asked questions

How do I compare order quantities properly?

Add storage, capital cost and obsolescence over each quantity's sell-through period, then compare total cost per unit rather than quoted price per unit.