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Quantity discount calculator.

Before offering “buy three, save 10%,” check what the order leaves after costs. Compare the larger discounted order with a smaller full-price purchase—and with someone buying three anyway.

Watch the 65-second cost example · See a quantity offer in Shopify · No signup or store connection.

Example: a $20 product that costs $12, with 10% off when buying three. Enter your actual fees and order costs. View calculation.

Before tax, with no quantity discount.

Include product cost and any per-unit handling. Exclude the percentage fee entered below.

A percentage off every unit in the qualifying group.

For example, 3 for a buy-three offer. Model the same product variant.

The full-price purchase you want to compare with.

Applied to merchandise revenue after discount. Ladder adds no percentage fee.

Packing, fixed processing fees and shipping cost after the customer’s delivery charge. Do not double-count unit costs.

Allow for a heavier parcel or extra handling. Exclude costs already entered per unit.

YOUR SCENARIO

Offer contribution $18.00. Difference $10.00.

More units. Enough margin?

Current order at full price
$8.00
Qualifying order after the discount
$18.00
Difference in contribution per modeled order
$10.00

The qualifying order contributes at least as much as the current order under these assumptions.

Discounted unit price: $18.00. Merchandise revenue for the qualifying order: $54.00.

If the shopper would buy the same quantity at full price, that order contributes $24.00. The discount gives up $6.00 of that contribution.

2 discounted units would cover the current order’s contribution with the same per-order costs. This is a mathematical comparison, not a suggested eligibility threshold.

Contribution is before fixed overhead, app cost, tax and costs you have not entered. This does not predict larger baskets, extra orders or profit. Test other discounts, shipping and returns separately.

No signup or store connection. Calculations stay in your browser; entries are not uploaded or saved. Download your scenario to keep it.

A WORKED COST EXAMPLE

Worked example: $20 each, buy three at 10% off.

Follow the 65-second example, then enter your own costs above. The video is silent, with on-screen text and optional English captions.

With a $12 product cost, one full-price unit contributes $8. Three units at $18 each bring in $54 and cost $36, leaving $18 before other costs. That is $10 more contribution than selling one unit.

But three at full price would contribute $24. The offer gives up $6 if the shopper would have bought three anyway. Higher order value alone does not prove that a promotion is profitable.

These fictional inputs start with zero fees and other order costs. Enter your actual processing, packing and shipping costs before using the comparison. Results are displayed to two decimals; Shopify checkout rounding can differ by cents.

How the comparison works.

Discounted unit price = regular price × (1 − discount percentage). Contribution = quantity × [unit price × (1 − percentage selling fee) − unit cost] − other order costs.

The baseline uses the regular price and current quantity. The offer uses the discounted price and qualifying quantity. The same-quantity comparison uses the offer quantity and order costs at full price.

The quantity-to-match result rounds up to a whole unit and assumes order costs stay the same. It is shown only when the baseline and discounted unit contribution are both positive. It does not change your promotion’s eligibility rules.

SEE THE SHOPPER EXPERIENCE

From a quantity offer to checkout.

Watch Ladder’s short demo, then test your chosen product, threshold and discount on a duplicate theme. The recording uses a development store and sample products; it is not customer revenue evidence.

Install Ladder from the Shopify App Store or read all features and limitations.

What to check before publishing the offer.

  1. Use a variant with enough stock and a reason for shoppers to buy more than one.
  2. Test just below the threshold and at the threshold. Check the actual Shopify checkout total.
  3. Try other discounts, quantity changes and the destinations you ship to.
  4. Compare completed orders and contribution over time, including shoppers who already bought that quantity.

The calculator does not forecast demand, conversion lift or net profit. Fixed overhead, app fees, returns and unentered costs are outside this per-order model. Ladder’s tracked interactions are not completed orders.

Quantity discount or product bundle?

This example models multiple units of one product variant. A pair of different products is a separate decision. Compare add-ons, bundles and quantity discounts before choosing the setup.

Explore the gift-wrap, free-shipping and size-chart tools · Ask about Ladder setup