Direct answer: A bundle stays profitable when the discounted price still covers combined COGS, absorbed shipping, and payment fees, with enough margin to justify the promotion.
This guide shows a bundle-pricing formula, walks through a USD example, and links to a free calculator that shows the break-even discount ceiling.
Who this is for
Shopify merchants launching bundles, kits, or 'buy 3 save' offers who want a numeric check before publishing the promotion.
The formula
Bundle price = Σ item prices × (1 − Discount%).
Bundle profit = Bundle price − Σ COGS − Absorbed shipping − Payment fee.
Break-even discount ceiling: solve for the discount at which profit hits $0.
Pricing psychology tips
- Show the strikethrough sum of item prices next to the bundle price — the perceived saving matters.
- A 3-item bundle usually converts better than 2 items but is easier to over-discount.
- Test a fixed dollar discount vs a percent discount for the same margin outcome.
Illustrative bundle table
| Bundle | List | Discount | Bundle price | Margin |
|---|---|---|---|---|
| Starter kit | $63 | 15% | $53.55 | 36% |
| Pro kit | $120 | 20% | $96 | 29% |
| Trial pack | $25 | 25% | $18.75 | 12% |
Example calculation (USD)
Three items priced at $29, $19, $15 (total $63) with COGS $9, $5, $4 ($18 total). A 15% bundle discount = $53.55 price. Shared shipping $6 and 2.9% payment fee ($1.55). Profit = $53.55 − $18 − $6 − $1.55 = $28.00. Margin = 52.3%. The break-even discount before the bundle turns unprofitable is around 60%.
Common mistakes to avoid
- Ignoring the payment processing fee when calculating margin.
- Bundling only low-margin items — no anchor to absorb discount.
- Under-tracking bundle inventory when component SKUs sell individually.
- Applying a store-wide discount code on top of the bundle price.
Best practices
- Set a maximum stack rule so bundle prices can't combine with sitewide codes.
- Use a virtual bundle SKU so decrement logic is clean.
- Test a 4-week window before promoting a bundle in email.
Frequently asked questions
Should bundle items ship together?
Almost always — split shipments erase the shipping economics.
How large a discount is safe?
Anywhere from 10–25% is common; check the break-even ceiling before going higher.