Sum if bought separately
$50.00
Free calculator
Type two items' prices and costs plus your bundle price. The effective discount and the bundle margin move together as you type. No email, no gate, nothing leaves this page.
The calculator
The boxes start filled with an illustrative example, not a benchmark. Replace it with your own numbers.
Item A
What you sell item A for on its own, and what it costs you.
Item B
What you sell item B for on its own, and what it costs you.
Bundle
What you charge for both items together.
Bundle margin
This bundle discounts the two items 16.0% off buying them separately, and still clears a 57.1% margin at the $42.00 bundle price.
sum if bought separately = price A + price B discount % = (1 - bundle price / sum if bought separately) * 100 bundle cost = cost A + cost B bundle profit = bundle price - bundle cost bundle margin = bundle profit / bundle price * 100
This compares one bundle price against the sum of two standalone prices. It says nothing about whether the bundle changes how many units you actually sell, see the note below.
See it on your own data Real numbers from your Shopify store, not a guess.
This is pure arithmetic on the prices and costs you typed in. It does not tell you whether the bundle actually drives more total units sold. A bundle that just cannibalizes two full-price sales into one discounted sale can lose money overall even while showing a healthy margin here, because you have replaced two full-margin sales with one lower-margin one, not added a new sale.
Whether a bundle grows total volume or just reshuffles existing sales is a question about customer behavior, not arithmetic, and this calculator has no visibility into it.
Questions
There is no universal number. It depends on your starting margins, on how much extra volume the bundle needs to justify itself, and on what discount level actually reads as compelling to your customers. A common approach is to work backward from a margin you are willing to accept and let the discount fall out of that, which is what this calculator lets you test.
No. Bundling almost always lowers blended margin compared to selling both items at full price, that is the mechanical cost of offering a discount. It can still be a good decision if it drives meaningfully more total volume, but if it just shifts existing full-price buyers into the cheaper bundle, it can quietly reduce total profit even though the bundle's own margin number looks fine.
There is no fixed rule, and it varies by category and by what customers naturally buy together. Two items is the simplest case to reason about, which is why this calculator uses it, but the same math extends to any number of items: sum the individual prices, sum the individual costs, and compare against the bundle price.
Bundle margin is a blend, and it is mechanically pulled down from the higher of the two individual margins toward the lower one, then pulled down further by whatever discount the bundle price represents. If one item carries most of the margin, a bundle can quietly erode it more than it looks like at a glance.
Most commonly, when the items already run thin margins on their own. Discounting two already-thin-margin items further can push bundle profit close to zero or negative, even at a modest-looking discount percentage. Bundles tend to work best when at least one item in the pair carries enough margin to absorb the discount.
Next
Upstream reads real per-order cost, real per-SKU landed cost, and real per-order shipping straight from your store, and nets ad spend and returns against it too. It is the connected version of the calculator above.