How to Use This Tool
Subtract component, packaging, payment and shipping costs from one bundle price. Calculate bundle contribution dollars, margin, net revenue and break-even discount from editable price and cost assumptions.
The decision this tool supports
Bundles can lift average order value while quietly adding product, packaging and shipping costs faster than revenue. This page keeps the decision bounded to contribution per bundle and the supporting outputs shown beside it. Bundle Contribution does not import an account, infer a market rate, or silently substitute an industry average.
Inputs and units
The Bundle Contribution calculation uses Bundle selling price, Component A cost, Component B cost, Bundle packaging cost, Outbound shipping cost, Payment fee rate. Keep all money values in one currency and all time, distance, mass, energy or volume entries in the unit printed beside the field. Mixing Bundle Contribution scopes can produce a plausible number with the wrong meaning.
- Bundle selling price is entered in currency.
- Component A cost is entered in currency.
- Component B cost is entered in currency.
- Bundle packaging cost is entered in currency.
- Outbound shipping cost is entered in currency.
- Payment fee rate is entered in % of price.
Formula and worked check
Contribution = bundle price × (1 − payment fee rate) − component, packaging and shipping costs. A $75 bundle with $44 direct costs and a 3% payment fee produces $28.75 contribution, 38.3% of selling price. The Bundle Contribution default is an executable known-answer case, not a benchmark or recommendation. Change one input and verify that the direction of contribution per bundle still matches the stated relationship.
How to interpret the result
Compare contribution dollars with the separate-item alternative using the same fee and fulfillment scope; margin alone can favor a smaller dollar contribution. The additional Bundle Contribution outputs expose the denominator, comparison, capacity or reverse value needed to audit the primary result instead of presenting one unexplained number.
Assumptions
- All component quantities are represented by the entered costs.
- Fee applies to the full selling price.
- Outbound shipping is allocated once per bundle.
Save the Bundle Contribution input values and date with any material decision. A later Bundle Contribution rerun is reproducible only when the same assumptions and units are available.
Limitations and safety boundary
The page excludes tax, returns, pick labor, promotions, inventory carrying cost, attach-rate changes and channel-specific fee tiers. Bundle Contribution is an estimate and cannot replace a contract, local code, licensed professional, calibrated measurement, lender statement or platform report where one governs the decision.
Source and privacy
The Bundle Contribution definition or rule was checked against U.S. Small Business Administration — Manage your finances on 2026-08-26. Recheck U.S. Small Business Administration — Manage your finances when a specification or policy behind Bundle Contribution can change. Bundle Contribution arithmetic runs in this browser tab; ecech does not receive the values through a calculation API.
Sources & assumptions
Tool Spec v2 · verified 2026-08-26. Platform rules and fees can change; the editable inputs remain authoritative for your account.
Official references
- U.S. Small Business Administration — Manage your finances (checked 2026-08-26)
Model assumptions
- All component quantities are represented by the entered costs.
- Fee applies to the full selling price.
- Outbound shipping is allocated once per bundle.
- The page excludes tax, returns, pick labor, promotions, inventory carrying cost, attach-rate changes and channel-specific fee tiers.
