Shopify Bundle Gross Margin & Break-Even Calculator

Model unit economics, gross margins, and required volume lift before launching bundle discounts or variety packs on Shopify.

1. Enter Unit Economics

Base Retail Price ($ per unit) Individual item price

Unit COGS ($ per unit) Cost of Goods Sold

Bundle Pack Size (Units) e.g. 3-pack, 6-pack

Bundle Discount (%) Target promotion tier

Fulfillment & Shipping ($ per order) Average outbound cost

Payment Gateway Fee (%) e.g. Shopify Payments (2.9% + $0.30)

2. Projected Economics

Full Retail Total: $45.00

Bundle Checkout Price: $36.00

Customer Dollar Savings: $9.00 (20%)

Total Product COGS: $12.00

Est. Payment Processing Fee: $1.34

Net Contribution Profit: $17.16

Gross Margin %: 66.7%

Required Volume Lift:

Sales increase to match baseline profit

+12.5%

Build This Bundle in Packmix →

Mathematical Formulas & Transparency

This calculator uses standard accrual unit economics principles:

• Bundle Selling Price = (Unit Price × Pack Size) × (1 - (Discount % / 100))
• Net Contribution Margin = Bundle Selling Price - (Unit COGS × Pack Size) - Shipping Cost - Payment Fees
• Break-Even Volume Lift = ((Baseline Single-Item Unit Margin × Pack Size) / Bundle Contribution Margin - 1) × 100

Model Assumptions & Limitations

Assumes fixed outbound shipping per order (bundling multiple units into a single package lowers per-unit fulfillment expense).
Payment gateway calculation uses standard US domestic tier (2.9% + $0.30). Custom merchant processing rates may vary.
Does not account for variable return rates or customer acquisition costs (CAC).