How the calculator works
The math is deliberately plain. Bundle price is the sum of component selling prices minus the discount. Profit per bundle is the bundle price minus the sum of unit costs. Margin is profit divided by bundle price. The interesting number is the last one: because a discount comes entirely out of profit, not revenue, a 15% bundle discount at a 50% gross margin removes 30% of your profit per sale. The break-even volume lift is how much more often the bundle must sell, compared to the components selling separately, before the discount has paid for itself: profit-if-sold-separately divided by profit-per-bundle, minus one.
How to read the break-even lift
The lift number is a threshold, not a verdict. Bundles do things besides raise volume: they move slow stock alongside best-sellers, raise average order value, and simplify choices for gift buyers. A bundle below its break-even lift can still be the right call if it is clearing inventory you would otherwise discount anyway. But if the bundle's job is profit, the lift is the bar it has to clear, and it is worth knowing that a deep discount at a thin margin sets that bar at "must double sales" before you commit to it in a campaign.
Three rules of thumb that fall out of the math
- Keep the discount well below your gross margin percentage. Once the discount approaches the margin, profit per bundle approaches zero and the required lift approaches infinity.
- High-margin components subsidize low-margin ones. A bundle mixing a 70%-margin serum with a 25%-margin accessory can carry a discount the accessory alone never could. Compute the blend, not the average.
- Percentage discounts scale with price; fixed amounts do not. A percentage stays proportional across markets and price changes. A fixed amount silently deepens as a share of cheaper configurations — and behaves worse in foreign currencies (see the multi-currency checklist).
From spreadsheet to storefront
The calculator tells you whether a bundle is worth offering. What it cannot tell you is whether the store will actually charge what you decided — in every market, in every currency, after every catalog change. That is the half Solid Bundles was built for: bundles serious operations can trust. It applies percentage discounts with per-line allocations at original prices (the order shape an ERP reconciles), and its one-click verification builds real test carts in every market you sell in and reports what customers will actually pay before a bundle goes live.
When the numbers work, build the bundle and let verification prove every market charges what you decided here. Flat monthly price at any volume — a strong month never changes your bill: email [email protected] with questions.
View on the App StoreChoosing a bundle app first? Start with the two architectures and the five-minute test. Selling internationally? Run the multi-currency checklist.