Editorial attribution: BizCalcAtlas editorial team. Formula and source provenance follow the published methodology.
Free Shipping Profitability: Break-Even Guide for Sellers explains free shipping profitability with the same definitions and calculation method used by the linked tools. Use the method for a consistent scenario, then verify any current rate, legal rule, or platform policy against the cited source.
Answer in brief
old contribution = old revenue - variable order costs new contribution = new revenue - new variable order costs contribution change = new contribution - old contribution required orders for same contribution = old total contribution / new contribution per order
Scope and definitions
This guide owns the informational intent; linked calculator pages continue to own interactive calculator intent.
The guide supports E-commerce Profit Calculator. Keep the numerator, denominator, cost categories, fee base, and time period consistent from the first input through the final comparison.
Calculation method
| Step | Calculation or rule |
|---|---|
| 1 | old contribution = old revenue - variable order costs new contribution = new revenue - new variable order costs contribution change = new contribution - old contribution required orders for same contribution = old total contribution / new contribution per order |
Formula / rule
old contribution = old revenue - variable order costs
new contribution = new revenue - new variable order costs
contribution change = new contribution - old contribution
required orders for same contribution = old total contribution / new contribution per order
Worked example
Old contribution is $66 − $25 − $6 − $4 = $31. New contribution is $65 − $25 − $6 − $4 = $30. The free-shipping scenario gives up $1 of contribution per order. To match $3,100 of contribution generated by 100 old-scenario orders, the new scenario needs about 103.34 orders, so at least 104 whole orders if all orders match the assumptions.
This does not predict that free shipping will increase conversion. It shows the order-volume threshold needed if it does.
Practical reference
Record the relevant scenario fields together before calculating. The implementation brief calls for these comparison fields: Item, Charged shipping, Free shipping scenario. Using one record prevents values from different periods or scopes from being mixed.
Common mistakes
- Using a different definition or time period from the one specified by the free shipping profitability method.
- Comparing outputs from E-commerce Profit Calculator without holding the shared assumptions constant.
- Treating a worked scenario as a universal target instead of testing the inputs that apply to the business.
- Relying on an undated secondary claim when the listed first-party or official source governs a current rate or rule.
Frequently asked questions
How is free shipping profitability calculated?
Use this method: old contribution = old revenue - variable order costs new contribution = new revenue - new variable order costs contribution change = new contribution - old contribution required orders for same contribution = old total contribution / new contribution per order Keep every input on the same period and definition basis.
Which assumptions matter most?
Free Shipping Profitability: Break-Even Guide for Sellers uses the defined method and scope above. Keep the calculation consistent with E-commerce Profit Calculator and do not treat the example as a universal recommendation.
What should be verified before using the result?
The answer depends on the scenario and assumptions. Use the stated method for free shipping profitability, then test the result with the linked calculators and verify any current rate or rule against the listed sources.
How this guide was created and tested
- Method basis: the guide uses the same definitions and method boundaries as the linked calculator family and the audited implementation package.
- Validation coverage: the linked calculators currently contribute 2 audited release test vectors to the underlying calculation methods used by this guide.
- Source hierarchy: current rates, fees, laws, or platform rules prefer government and first-party sources; educational and industry references are supporting evidence rather than silent overrides.
- Automation and AI: automation or AI may assist drafting, organization, source grouping, and regression work, but it is not treated as an authoritative source and cannot replace the cited evidence or audited formula.
- Editorial responsibility: MIASIN S.R.O. controls publication, source policy, corrections, and release decisions. No named individual expert review is claimed unless a page explicitly identifies one.
Read the full Methodology, Editorial Standards, and Corrections Policy.
Sources and review
Sources are ordered by authority: government or official sources first, then first-party platform sources, educational references, and finally supporting industry references.
- Government / official source: U.S. Small Business Administration
- Educational reference: OpenStax
- Educational reference: OpenStax
- Educational reference: OpenStax
- Supporting industry reference: ups.com
- Supporting industry reference: usps.com
Last reviewed: September 22, 2026
Source set reviewed: September 22, 2026
Next scheduled review: September 22, 2027
Review guidance: Medium — method is stable; carrier and platform costs should be refreshed when pricing changes.