Product Bundle Discount Calculator
Bundling moves more units and clears slow SKUs, but the discount comes straight out of margin. This shows what a bundle actually profits after COGS on every item in it, and exactly how much profit you're giving up per bundle compared to selling everything separately at full price.
What your result means
The calculator shows the bundle price, the profit and margin you make on each bundle after COGS, and the profit given up per bundle compared with selling the same items separately at full price.
That last figure is the cost of the bundle. It's worth paying when the bundle sells items you wouldn't otherwise sell, such as slow stock paired with a best-seller.
How the bundle formula works
Bundle price = Combined full price × (1 − Bundle discount %) Bundle profit = Bundle price − Combined COGS Bundle margin = Bundle profit ÷ Bundle price Profit given up = (Combined full price − Combined COGS) − Bundle profit
- Combined full price
- sum of the items' regular prices
- Combined COGS
- sum of the items' costs
Profit given up always equals the discount in dollars, because the costs don't change; only the price does.
Worked example
Worked exampleExample numbers
These match the calculator's default inputs.
| Input | Value |
|---|---|
| Combined price if sold separately | $100 |
| Combined COGS | $40 |
| Bundle discount | 20% |
- Bundle price = $100 × (1 − 0.20) = $80
- Bundle profit = $80 − $40 = $40, a margin of $40 ÷ $80 = 50%
- Profit given up = ($100 − $40) − $40 = $20 per bundle
Sold separately, the items would earn $60 at a 60% margin. The bundle earns $40, so it needs to sell items that wouldn't have sold otherwise to come out ahead.
How to make bundles profitable
- Pair slow movers with best-sellers. The bundle clears stock that would otherwise cost you carrying cost each month. The dead stock calculator shows what that's worth.
- Keep the discount modest. A visible saving matters more to shoppers than the exact percentage.
- Bundle complementary items, so the bundle raises order value rather than just discounting what customers already buy.
- Track components properly. Make sure selling a bundle deducts stock from each item in it, or your inventory counts will drift.
The guide to product bundling covers bundle types and pricing in more depth.
Common mistakes
- Comparing against a sale that wouldn't have happened. The "profit given up" assumes the customer would have bought every item at full price. If they'd only have bought one, the bundle may be adding profit, not costing it.
- Discounting the hero product. If one item drives the bundle's appeal, a smaller discount usually works. Let the slow items carry the deal.
- Forgetting shipping savings. One parcel instead of three can save real money, which offsets part of the discount.
- Not tracking component stock. Selling a bundle must reduce stock for each item in it, or you'll oversell.
- Running bundles forever. Review them every few months. A bundle built to clear stock should end when the stock is gone.
FAQ
How do I price a product bundle?
Start from the combined full price of the items, choose a discount that feels meaningful to customers, then check the bundle's profit after COGS. If the profit given up per bundle is more than the extra sales are likely to bring in, use a smaller discount.
When is a bundle discount worth it?
When it sells units you wouldn't otherwise sell: a slow-moving item paired with a best-seller, or a second product a customer wouldn't have added on their own. If customers would have bought every item anyway, the discount is pure margin lost.
Does this include shipping?
No. It compares price and COGS only. If the bundle ships as one parcel instead of several, your shipping saving can offset part of the discount, so factor it in separately.